Date   

Re: Gaps in AVHRR images yesterday.

geojohnt@...
 

Robert,

Aha, 'that more like it.'
The low SNR possibly causing your your more frequent gaps in data?

Regards,
John.


+++++++++++++++++

-----Original Message-----
From: Robert Moore <rsmoore@...>
To: 'MSG-1@groups.io' <MSG-1@groups.io>
Sent: Sat, 26 Sep 2020 20:36
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

Maybe misreading the console Ernst. I've attached a screenshot - C/N is 11 in this shot, it's been up and down.


Robert


Re: Gaps in AVHRR images yesterday.

geojohnt@...
 

Robert,

I agree with Ernst.
Oh for 18.9 dB SNR!

Oh for the 14.2 dB I had in the good old days.

Something amiss somewhere.

Regards,
John.

+++++++++++++++++++

-----Original Message-----
From: Ernst Lobsiger via groups.io <ernst.lobsiger@...>
To: MSG-1@groups.io
Sent: Sat, 26 Sep 2020 19:53
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

Am 26.09.2020 20:14, schrieb Robert Moore:
> Investigated the Novra box today: I have Signal strength of -35 dBm,
> carrier  to noise 18.9 dB
> Not so good?
>
> Robert
>
>
>
>

Robert

Probably nobody of us has C/N = 18.9 dB. You need at least a 2.5m dish
for that (happy pointing). Are you sure this is your C/N, SNR or EsNo?

Ernst



Re: Gaps in AVHRR images yesterday.

geojohnt@...
 

David,

>GOES channel selection - there are boxes on the Setup tab.  Uncheck those 
>you don't want.

Oh sorry, how could I be so blind!!!
Honestly?

Just as a bye the bye, in a 24 hour period between 19:03 and 19:28 UTC Sept 25/26 with no heavy rain and variable cloud cover, my missed/recovered packet readings over that period were:

BS 0, 0.             Those figures remain today at 11:30 UTC
HVS-1 6. 2.       Those figures remain today at 11:30 UTC

SR1 BFC 1 BPC 1. Those figures remain today at 11:30 UTC.

Regards,
John.

++++++++++++++++++++++++++

John,

Thanks for disabling Windows search.

As I've mentioned before, I don't use or recommend BullGuard and consider 
the Microsoft Defender protection adequate for machines such as yours 
(assuming you are careful what Web sites you visit).  Best to ask another 
user of that software.

GOES channel selection - there are boxes on the Setup tab.  Uncheck those 
you don't want.


Cheers,
David
-- 
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

++++++++++++++++++++++++++


I note you do not say turn BullGuard off.


Looking at BullGuard Network Activity, Tellicast is going 'through it.'
And I attach a couple of screen shots of part of its Manage Rules list which
contain TC.


Also a shot - Settings - Skip files/folders - box is default ticked.
Should/could, Don't scan files from network locations, be ticked?


Oh, and I think you might have misunderstood me regarding GOES channel
selection.
I can't find a way to deselect channels I don't want.


Regards,
John.
=====================================






Re: Gaps in AVHRR images yesterday.

Ernst Lobsiger
 

On Sat, Sep 26, 2020 at 12:36 PM, Robert Moore wrote:
Maybe misreading the console Ernst. I've attached a screenshot - C/N is 11 in this shot, it's been up and down
Robert

Don't pay too much attention to Signal Strength. This number is also hard to compare between different receiver types.

Your C/N = SNR = 11 dB is marginal for HVS-1 or HVS-2 reception. And as discussed before, this will also disturb BASIC.
You should have SNR = 12 - 13 dB. If this changes rapidly with big amplitude your dish could be fluttering in the wind (?).

Below is what I have right now taking 4 TC transponders with NO packet loss on a TBS-6908 V10 (manufactured 2014).

Cheers
Ernst



Re: Gaps in AVHRR images yesterday.

Robert Moore
 

Maybe misreading the console Ernst. I've attached a screenshot - C/N is 11 in this shot, it's been up and down.


Robert

-----Original Message-----
From: MSG-1@groups.io <MSG-1@groups.io> On Behalf Of Ernst Lobsiger via groups.io
Sent: 26 September 2020 19:53
To: MSG-1@groups.io
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

Am 26.09.2020 20:14, schrieb Robert Moore:
Investigated the Novra box today: I have Signal strength of -35 dBm,
carrier to noise 18.9 dB Not so good?

Robert



Robert

Probably nobody of us has C/N = 18.9 dB. You need at least a 2.5m dish for that (happy pointing). Are you sure this is your C/N, SNR or EsNo?

Ernst


Re: Gaps in AVHRR images yesterday.

Ernst Lobsiger
 

Am 26.09.2020 20:14, schrieb Robert Moore:
Investigated the Novra box today: I have Signal strength of -35 dBm,
carrier to noise 18.9 dB
Not so good?
Robert
Robert

Probably nobody of us has C/N = 18.9 dB. You need at least a 2.5m dish
for that (happy pointing). Are you sure this is your C/N, SNR or EsNo?

Ernst


Re: Gaps in AVHRR images yesterday.

Robert Moore
 

Investigated the Novra box today: I have Signal strength of -35 dBm, carrier to noise 18.9 dB
Not so good?

Robert


Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

David,


Thanks for the advice.


Right, Windows search disabled.


- ensure that you are not running both Windows Defender /and/ the BullGard.


Interesting(?) that.
When I go to Settings > Windows Security > Firewall and Network protection [Domain network No action needed. Private network No action Needed. Public network No action needed] then click 'Who's protecting me.' > Manage providers > Security providers >

'Antivirus' says BullGuard AV on, Microsoft Defender AV off.


'Firewall' says BullGuard Firewall is turned on, Windows Firewall is turned on.


'Web protection' No providers.


When I 'mouse over' and click 'Windows Firewall' > open app > (thinking I can turn it off) I get another window - Firewall & network protection.


Domain network - Active domain network Not connected. BullGuard Firewall on. Microsoft Defender firewall off as using other providers.

For Active private networks - Not connected, BullGuard on, Defender off as using ........


For Public network (Networks in a public space such as an airport or coffee shop, and where your device is set to not discoverable) Active public networks: TALKTALK ........., Unidentified network [SR1?] - Bullguard on, Defender off as using .........


This for most here this is basic configuration (sorry everyone) but I find it confusing 'Public/Private' and a bit contradictory


I note you do not say turn BullGuard off.


Looking at BullGuard Network Activity, Tellicast is going 'through it.'
And I attach a couple of screen shots of part of its Manage Rules list which contain TC.


Also a shot - Settings - Skip files/folders - box is default ticked.
Should/could, Don't scan files from network locations, be ticked?


Oh, and I think you might have misunderstood me regarding GOES channel selection.
I can't find a way to deselect channels I don't want.


Regards,
John.
=====================================

John,

Thanks for disabling Windows search.

As I've mentioned before, I don't use or recommend BullGuard and consider the Microsoft Defender protection adequate for machines such as yours (assuming you are careful what Web sites you visit). Best to ask another user of that software.

GOES channel selection - there are boxes on the Setup tab. Uncheck those you don't want.

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

geojohnt@...
 

David,

Thanks for the advice.

Right, Windows search disabled.

>- ensure that you are not running both Windows Defender /and/ the BullGard.

Interesting(?) that.
When I go to Settings > Windows Security > Firewall and Network protection [Domain network No action needed. Private network No action Needed. Public network No action needed] then click 'Who's protecting me.' > Manage providers > Security providers >
 
'Antivirus' says BullGuard AV on, Microsoft Defender AV off.

'Firewall' says BullGuard Firewall is turned on, Windows Firewall is turned on.

'Web protection' No providers.

When I 'mouse over' and click 'Windows Firewall' > open app > (thinking I can turn it off) I get another window - Firewall & network protection.

> Domain network - Active domain network Not connected. BullGuard Firewall on. Microsoft Defender firewall off as using other providers.

For Active private networks - Not connected, BullGuard on, Defender off as using ........

For Public network (Networks in a public space such as an airport or coffee shop, and where your device is set to not discoverable) Active public networks: TALKTALK ........., Unidentified network [SR1?] - Bullguard on, Defender off as using .........  

This for most here this is basic configuration (sorry everyone) but I find it confusing 'Public/Private' and a bit contradictory

I note you do not say turn BullGuard off.

Looking at BullGuard Network Activity, Tellicast is going 'through it.'
And I attach a couple of screen shots of part of its Manage Rules list which contain TC.

Also a shot - Settings - Skip files/folders - box is default ticked. 
Should/could, Don't scan files from network locations, be ticked?

Oh, and I think you might have misunderstood me regarding GOES channel selection.
I can't find a way to deselect channels I don't want.

Regards,
John.

+++++++++++++++++++++


John,

Obviously I can't tell you what data you do or do not wish to take!

- For GOES it depends on what you want to do with the data.  Quite 
reasonable false-colour images can be produced with the same wavebands as 
available on SEVIRI, visible 0.8 um and thermal 10 um - bands 3 and 13.

- For Manage CH.1 data, yes ticked, but it's unlikely you want IASI or much 
of the sounder data (do you use it?).

- For Other-2, the MODIS ticks sound correct.

However, before messing with those settings, some simpler changes that I 
would recommend:

- disabling Window search (the "disable the service" method

  https://www.howtogeek.com/howto/10246/how-to-disable-search-in-windows-7/

- ensure that you are not running both Windows Defender /and/ the BullGard.

- excluding all EUMETCast directories from the anti-virus (that's the \tmp\ 
and below, the \received\ and below).    Normally with anti-virus excluding 
one directory will also exclude all those below it, so just two directories 
need excluding.


Cheers,
David
-- 
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


-----Original Message-----
From: David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 via groups.io <david-taylor@...>
To: MSG-1@groups.io
Sent: Fri, 25 Sep 2020 15:56
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

David,

Thanks for your further comments.

I run MSG-4, IODC and RSS MDM's but in reduced channels.
The above MSG-4 MDM FSD FY-2H, FY-2G both 6 channels selected - GOMS all
channels selected but it  seems to have disappeared.
AVHRR Manager NOAA 19, Metop A, B and C.
MSG Animator Europe cropped IR - Today's date only.
Himawari - VIS, IR1, IR2, IR3, IR4.
GOES 16 and GOES 17 both full 16 channels appear selected - can these be
trimmed?
Metop Manager x 2 for B and C.

I 'take' Modis data but don't have the programme open.

And in MSG-4 MDM Other - 1, ATOVS & sounder data Manage Ch. 1 data is ticked
and all boxes below ticked ATOVS retention 1.

'Others-2' only Modis L1/L2 data Manage MODIS L1/L2 and Copy M02 sensor
files is ticked - Data retention 1.
'Others-2' also only Ch. 12 data all three boxes ticked with Fire retention
1.

Sorry everyone if this is all a bit tedious.
Hopefully for some users it might be helpful?

One thing you mentioned that could be relevant - Anti-virus software.

As you know I use the 'dreaded' BullGuard software.
This computer running 24/7 is used for EUMETCast only but has an open
Broadband Internet connection 24/7 for Windows and SatSignal updates.
EUMETCast data is (appears to be) going through BullGuard, as well.

Regards,
John.
===================================




Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

David,

Thanks for your further comments.

I run MSG-4, IODC and RSS MDM's but in reduced channels.
The above MSG-4 MDM FSD FY-2H, FY-2G both 6 channels selected - GOMS all channels selected but it seems to have disappeared.
AVHRR Manager NOAA 19, Metop A, B and C.
MSG Animator Europe cropped IR - Today's date only.
Himawari - VIS, IR1, IR2, IR3, IR4.
GOES 16 and GOES 17 both full 16 channels appear selected - can these be trimmed?
Metop Manager x 2 for B and C.

I 'take' Modis data but don't have the programme open.

And in MSG-4 MDM Other - 1, ATOVS & sounder data Manage Ch. 1 data is ticked and all boxes below ticked ATOVS retention 1.

'Others-2' only Modis L1/L2 data Manage MODIS L1/L2 and Copy M02 sensor files is ticked - Data retention 1.
'Others-2' also only Ch. 12 data all three boxes ticked with Fire retention 1.

Sorry everyone if this is all a bit tedious.
Hopefully for some users it might be helpful?

One thing you mentioned that could be relevant - Anti-virus software.

As you know I use the 'dreaded' BullGuard software.
This computer running 24/7 is used for EUMETCast only but has an open Broadband Internet connection 24/7 for Windows and SatSignal updates.
EUMETCast data is (appears to be) going through BullGuard, as well.

Regards,
John.
===================================

John,

Obviously I can't tell you what data you do or do not wish to take!

- For GOES it depends on what you want to do with the data. Quite reasonable false-colour images can be produced with the same wavebands as available on SEVIRI, visible 0.8 um and thermal 10 um - bands 3 and 13.

- For Manage CH.1 data, yes ticked, but it's unlikely you want IASI or much of the sounder data (do you use it?).

- For Other-2, the MODIS ticks sound correct.

However, before messing with those settings, some simpler changes that I would recommend:

- disabling Window search (the "disable the service" method

https://www.howtogeek.com/howto/10246/how-to-disable-search-in-windows-7/

- ensure that you are not running both Windows Defender /and/ the BullGard.

- excluding all EUMETCast directories from the anti-virus (that's the \tmp\ and below, the \received\ and below). Normally with anti-virus excluding one directory will also exclude all those below it, so just two directories need excluding.

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

geojohnt@...
 

David,

Thanks for your further comments.

I run MSG-4, IODC and RSS MDM's but in reduced channels.
The above MSG-4 MDM FSD FY-2H, FY-2G both 6 channels selected - GOMS all channels selected but it  seems to have disappeared.
AVHRR Manager NOAA 19, Metop A, B and C.
MSG Animator Europe cropped IR - Today's date only.
Himawari - VIS, IR1, IR2, IR3, IR4.
GOES 16 and GOES 17 both full 16 channels appear selected - can these be trimmed?
Metop Manager x 2 for B and C.

I 'take' Modis data but don't have the programme open.

And in MSG-4 MDM Other - 1, ATOVS & sounder data Manage Ch. 1 data is ticked and all boxes below ticked ATOVS retention 1.
  
'Others-2' only Modis L1/L2 data Manage MODIS L1/L2 and Copy M02 sensor files is ticked - Data retention 1.
'Others-2' also only Ch. 12 data all three boxes ticked with Fire retention 1.

Sorry everyone if this is all a bit tedious.
Hopefully for some users it might be helpful?

One thing you mentioned that could be relevant - Anti-virus software.

As you know I use the 'dreaded' BullGuard software.
This computer running 24/7 is used for EUMETCast only but has an open Broadband Internet connection 24/7 for Windows and SatSignal updates.
EUMETCast data is (appears to be) going through BullGuard, as well.

Regards,
John.
 
+++++++++++++++++++++++++

John,

I am not completely happy with SSDs for EUMETCast data because they have a 
limited number of write cycles, a limited total data throughput, resulting 
in a limited lifetime.  Perhaps with today's SSDs these limits are such that 
it's an acceptable choice,and if the user is aware of that, fine.  Remember 
that there's not only receiving the data, but there might be processing as 
well.  For HVS-2 it's something like 450 GB per day from the source.

HDD - slow
SSD - fast
RAMdisk - much faster

But RAMdisk is limited in capacity and may need more management.  Some of my 
systems are now using RAMdisk (1-2 GB for BAS, 10 GB for HVS-2 
[receive-only]) with Robocopy moving the data from the RAMdisk onto HDD once 
a minute, and with TrimTree running regularly to remove any lingering "tmp" 
files.  One HVS-1 system writes directly to a separate HD, One BAS system 
works well without any RAMdisk.

It's other things which can help too - preventing any unwanted disk access 
from e.g. indexing and anti-virus.  Minimising the data you take.

One thing which I'm increasingly finding critical is to maximise the number 
of data paths through the system.  Perhaps add a second HDD controller 
rather than just another SATA connection.  I'm currently thinking about 
adding a second USB internal hub for the TBS5925 as the PC has a single 
master hub.  There's an element of "try it and see" about this level of 
changes.

Cheers,

David

-- 
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv 

++++++++++++++++++++++++++++++++++

-----Original Message-----
From: David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 via groups.io <david-taylor@...>
To: MSG-1@groups.io
Sent: Thu, 24 Sep 2020 16:00
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

David,

Thanks for pointing me (again) to TD 15.
It really is now quite comprehensive.

And I still have my 999 MB RAMdisk unused which I was going to (will)
experiment with.
As you know Ops want me to do a couple of tests on my current setup which
I'll do hopefully under clear sky conditions - when they return.

I've also thought of having a second HDD for HVS-1 alone.

[I have an SSD for 'Windows.']

TD 15 also recommends RAMdisk - and interestingly - SSD's which you used not
to favour(?) as it points out HDD's are 'slow' in these days of high data
level I/O's..
And, Ernst has pointed out that the new generation of HDD's are 'slower' and
best avoided.

So I have a couple of updates to consider to 'speed things up?'

Regards,
John
=====================================







Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

David

I use(d) one common RAM disk of 3 GB for BASIC + HVS-1 + HVS-2. Your
problem are the broken tmp files.
I remove those if they have *not* been touched for XX minutes. Maybe
your trimtree can do that too.

BASIC: XX = 25
HVS-1: XX = 5
HVS-2: XX = 5

I only moved received and did the XX test every 2 minutes. I never had a
full RAM disk this way.

Cheers
Ernst
======================

Thanks, Ernst. Yes, I use TrimTree for exactly that function, although it's only run every 30 minutes (with a "delete older than 3 minutes" setting).

My environment is different to yours, with an HVS-2 link margin of around 2 dB, and a dish which visibly flutters in the wind!

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

Ernst Lobsiger
 

David

I use(d) one common RAM disk of 3 GB for BASIC + HVS-1 + HVS-2. Your problem are the broken tmp files.
I remove those if they have *not* been touched for XX minutes. Maybe your trimtree can do that too.

BASIC: XX = 25
HVS-1: XX = 5
HVS-2: XX = 5

I only moved received and did the XX test every 2 minutes. I never had a full RAM disk this way.

Cheers
Ernst


Am 25.09.2020 08:29, schrieb David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 via groups.io:

David,
the installation is relatively new. I like to observe how it performs
during the upcoming solar outage.
To write this up for GEO Quarterly is possible. But I need some help
with correcting the text by a english native speaker.
Cheers,
Thorsten
=================================
No problems, Thorsten! Very willing to help.
BTW: with HVS-1 and HVS-2 on a single 10 GB RAMdisk I've not run out
of space very often. Much more likely under low-signal and high wind
conditions here.
Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

David,

the installation is relatively new. I like to observe how it performs during the upcoming solar outage.
To write this up for GEO Quarterly is possible. But I need some help with correcting the text by a english native speaker.

Cheers,
Thorsten
=================================

No problems, Thorsten! Very willing to help.

BTW: with HVS-1 and HVS-2 on a single 10 GB RAMdisk I've not run out of space very often. Much more likely under low-signal and high wind conditions here.

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

Thorsten Miglus
 

David,

the installation is relatively new. I like to observe how it performs during the upcoming solar outage.
To write this up for GEO Quarterly is possible. But I need some help with correcting the text by a english native speaker.

Cheers,
Thorsten


On Thu, Sep 24, 2020 at 08:19 PM, David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 wrote:
This sounds like the best of the bunch, Thorsten! I'd rejected the cached-disk before as it wasn't possible to cache just a part of the disk (at least in the free version, IIRC). 128 GB SSD are about £/€/$ 15 so it won't break the bank.

Many thanks for giving the details of this installation, and especially the screen-shots.

Perhaps you might write this up for the GEO Quarterly?

Cheers,
David


Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

Hi all,

now I am using a 128 GB external SSD with USB 3.0 for all temp data from BAS, HVS-1 and HVS-2.
All target directories are situated on the SSD too. There is no need for Robocopy, because David's Software delete the files from the target directory after processing.

In Front of the SSD I have installed PrimoCache. (PrimoCache download)
Using a cache of 3 GB and with Defer-Write enabled (Native Mode INFINITE) nothing is written to the SSD at all.
Native Mode INFINITE means that data is written to the SSD when the cache is filled up only.
Under normal conditions this never happens because the files are deleted immediately after processing.
In situations, when broken temp files arrive, they are written to the SSD when the cache filles up.
As there is 128 GB room on the SSD I have not to take care of broken temp files.

Cheers,
Thorsten
=======================================

This sounds like the best of the bunch, Thorsten! I'd rejected the cached-disk before as it wasn't possible to cache just a part of the disk (at least in the free version, IIRC). 128 GB SSD are about £/€/$ 15 so it won't break the bank.

Many thanks for giving the details of this installation, and especially the screen-shots.

Perhaps you might write this up for the GEO Quarterly?

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Gaps in AVHRR images yesterday.

Thorsten Miglus
 

Hi all,

This is the corrected link: PrimoCache dowload

Cheers,
Thorsten


On Thu, Sep 24, 2020 at 06:53 PM, Thorsten Miglus wrote:
Hi all,

now I am using a 128 GB external SSD with USB 3.0 for all temp data from BAS, HVS-1 and HVS-2.
All target directories are situated on the SSD too. There is no need for Robocopy, because David's Software delete the files from the target directory after processing.

In Front of the SSD I have installed PrimoCache. (PrimoCache download)
Using a cache of 3 GB and with Defer-Write enabled (Native Mode INFINITE) nothing is written to the SSD at all.
Native Mode INFINITE means that data is written to the SSD when the cache is filled up only.
Under normal conditions this never happens because the files are deleted immediately after processing.
In situations, when broken temp files arrive, they are written to the SSD when the cache filles up.
As there is 128 GB room on the SSD I have not to take care of broken temp files.

Cheers,
Thorsten


Re: Gaps in AVHRR images yesterday.

Thorsten Miglus
 

Hi all,

now I am using a 128 GB external SSD with USB 3.0 for all temp data from BAS, HVS-1 and HVS-2.
All target directories are situated on the SSD too. There is no need for Robocopy, because David's Software delete the files from the target directory after processing.

In Front of the SSD I have installed PrimoCache. (PrimoCache download)
Using a cache of 3 GB and with Defer-Write enabled (Native Mode INFINITE) nothing is written to the SSD at all.
Native Mode INFINITE means that data is written to the SSD when the cache is filled up only.
Under normal conditions this never happens because the files are deleted immediately after processing.
In situations, when broken temp files arrive, they are written to the SSD when the cache filles up.
As there is 128 GB room on the SSD I have not to take care of broken temp files.

Cheers,
Thorsten












On Thu, Sep 24, 2020 at 05:02 PM, David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺 wrote:
John,

I am not completely happy with SSDs for EUMETCast data because they have a limited number of write cycles, a limited total data throughput, resulting in a limited lifetime. Perhaps with today's SSDs these limits are such that it's an acceptable choice,and if the user is aware of that, fine. Remember that there's not only receiving the data, but there might be processing as well. For HVS-2 it's something like 450 GB per day from the source.

HDD - slow
SSD - fast
RAMdisk - much faster

But RAMdisk is limited in capacity and may need more management. Some of my systems are now using RAMdisk (1-2 GB for BAS, 10 GB for HVS-2 [receive-only]) with Robocopy moving the data from the RAMdisk onto HDD once a minute, and with TrimTree running regularly to remove any lingering "tmp" files. One HVS-1 system writes directly to a separate HD, One BAS system works well without any RAMdisk.

It's other things which can help too - preventing any unwanted disk access from e.g. indexing and anti-virus. Minimising the data you take.

One thing which I'm increasingly finding critical is to maximise the number of data paths through the system. Perhaps add a second HDD controller rather than just another SATA connection. I'm currently thinking about adding a second USB internal hub for the TBS5925 as the PC has a single master hub. There's an element of "try it and see" about this level of changes.

Cheers,
David


Re: Gaps in AVHRR images yesterday.

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

David,

Thanks for pointing me (again) to TD 15.
It really is now quite comprehensive.

And I still have my 999 MB RAMdisk unused which I was going to (will) experiment with.
As you know Ops want me to do a couple of tests on my current setup which I'll do hopefully under clear sky conditions - when they return.

I've also thought of having a second HDD for HVS-1 alone.

[I have an SSD for 'Windows.']

TD 15 also recommends RAMdisk - and interestingly - SSD's which you used not to favour(?) as it points out HDD's are 'slow' in these days of high data level I/O's..
And, Ernst has pointed out that the new generation of HDD's are 'slower' and best avoided.

So I have a couple of updates to consider to 'speed things up?'

Regards,
John
=====================================

John,

I am not completely happy with SSDs for EUMETCast data because they have a limited number of write cycles, a limited total data throughput, resulting in a limited lifetime. Perhaps with today's SSDs these limits are such that it's an acceptable choice,and if the user is aware of that, fine. Remember that there's not only receiving the data, but there might be processing as well. For HVS-2 it's something like 450 GB per day from the source.

HDD - slow
SSD - fast
RAMdisk - much faster

But RAMdisk is limited in capacity and may need more management. Some of my systems are now using RAMdisk (1-2 GB for BAS, 10 GB for HVS-2 [receive-only]) with Robocopy moving the data from the RAMdisk onto HDD once a minute, and with TrimTree running regularly to remove any lingering "tmp" files. One HVS-1 system writes directly to a separate HD, One BAS system works well without any RAMdisk.

It's other things which can help too - preventing any unwanted disk access from e.g. indexing and anti-virus. Minimising the data you take.

One thing which I'm increasingly finding critical is to maximise the number of data paths through the system. Perhaps add a second HDD controller rather than just another SATA connection. I'm currently thinking about adding a second USB internal hub for the TBS5925 as the PC has a single master hub. There's an element of "try it and see" about this level of changes.

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv


Re: Dish alignment - formally Re: [MSG-1] Gaps in AVHRR images yesterday.

Cornish Man
 

Hi John

 

I moved the dish out of the path of the tree and mounted it higher.

And used dishpointer to align it first, then move it till I get a stronger signal as well as the skew

 

I will have to take the dish down soon as the council is putting a new roof up and the dish will be in the way of the scaffolding  

 

Jan

 

Sent from Mail for Windows 10

 

From: geojohnt via groups.io
Sent: 24 September 2020 13:03
To: MSG-1@groups.io
Subject: Dish alignment - formally Re: [MSG-1] Gaps in AVHRR images yesterday.

 

Jan,

 

I seem to remember you said in the past that you were not sure about a tree, or was it part of a roof 'in the way?'

We will soon be coming up to Sun, satellite, dish co-linearity in October so you will have several days to see if anything is 'shadowing' your dish. 

In the meantime you can find out the Eutelsat 10 A solar crossing time for your location from David's WXtrack which will give you an idea of any current or future potential shadowing as the Sun gets lower towards co-linearity.

 

And have you tried www.dishpointer.com (recommended by EUMETSAT) which will show what is 'ahead of your dish' locally.

 

Oh, and skew is very important since there is (also) a V channel transmitting at 11.623 GHz which needs to be nulled out with accurate skew adjustment.

 

Regards,

John.

 

++++++++++++++++++++++++++++++

-----Original Message-----
From: Cornish Man via groups.io <cornishman68@...>
To: MSG-1@groups.io <MSG-1@groups.io>
Sent: Thu, 24 Sep 2020 11:49
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

Hi John.

 

I know I should be getting more DB’s

I adjust the dish Manually as I don’t have a Dish Finder.

 

Using my mobile with Remote Desktop I adjust the dish to get the best signal.

 

I purchased a Inverto Black Ultra LNB a month and I found that I got 1db or so less signal than with my old Technomate T2 LNB

 

Cheers

 

Jan

 

 

Sent from Mail for Windows 10

 

From: geojohnt via groups.io
Sent: 24 September 2020 10:35
To: MSG-1@groups.io
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.

 

Hello Cornish Man,

 

Well if you are in Cornwall and using a 110 cm dish, you've got problems.

But then I think we have discussed this in the past?

 

I'm using a 1 m dish with an Inverto Black Ultra LNB in SW London and at the moment 09:25 UTC with clear skies am getting 13.1 dB SNR with an SR1.

 

You are well within the maximum signal contour so should be getting much better SNR.

 

Regards,

John.