| Stefan Ritt wrote: |
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| lance wrote: |
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| lance wrote: |
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We are running elog across two sites and synchronizing every four hours on change only. There are about 100 entries per day of which most are just one line entries. However this is taking up to 9 mins and during the replication process the server gives us an "unavailable" error. We are using a T1 across the sites so bandwidth should not be an issue, I am confused as to why this takes so long.
The issue for us is not how long the sync takes, providing this was happening in the background, and doesnt lock out the server while the replication was taking place. We are operating under a 24 hour call center type environment so the server being available all the time is of paramount importance.
We use version 2.7.2 and I know there have been several changes made since this version. Would changing to the latest version have any impact on this?
Cheers,
Lance
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Stefan,
I have been running logging and I think I have found the problem however I do not know how to resolve it.
Here is where it is going wrong:
19-May-2009 04:02:48 [] {NSS} MIRROR: ID21268: Local entry submitted
19-May-2009 04:07:34 [] {AMC} MIRROR: send entry #31056
It seems that when it has finished replication on one logbook there is a significant time before the next logbook replication starts. During this time the server is not avalable. I have noticed that the time between ending one logbook and starting the next differs betwee 2 and 5 minutes. Again the server is not available when this happens.
Do you have any idea?
Cheers,
Lance
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Hi,
I need more information to narrow down the problem:
- does this only happen on automatic mirroring or also when you do a manual synchronize?
- does this happen on both sides, like when you make the "other" elog server the master?
- if the server is inresponsive, does the CPU on that machine go to 100% or to 0%?
- do you have very long attachments in your logbooks?
- do you have the same problem on a "tiny" logbook like it comes with the distribution?
- are you using any Apache proxy in between?
I'm afraid that in the end you have to debug this yourself, since it will be very hard for me to reproduce exactly your problem (unless you send me all your files).
Cheers,
Stefan
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Stefan,
Thanks for the reply.
This happens on automatic mirroring and by manual sync. However only the site initializing the mirror is locked out the remote seems to still be able to function.
The CPU jumps from very little usage to 50%+ being used by elogd.exe as soon as you start the mirroring/sync process
I have attached a file that that is in three parts and its pretty big. When I start up the elogd -v it takes over two minutes to scroll through hundreds of files. I have attached the last of those entries in the first part of the attached PDF, the second part of the PDF shows a manual sync and the third part shows the same sync on the same logbook a few mins later. It seems to take about 3 minutes even when there has been no new log entries. In addition if you are mirroring more that one log book through the automated cron job it can take about 3-5 mins before the second logbook starts its replication. I have also added a screenshot of the completed replications on both runs.
If there is a way to redirect the output of the cmd window when running elogd -v I would capture all the data for you but the standard redirect ">> elog.txt" only creates a blank file.
We are running several logbooks and it does look like the smaller logbooks still take several minutes to start up. I have attached the PMCLogfile and if you look between the NSS and the AMC replications on any day there seems to be a 3 min gap between one book finishing and another starting.
We are not using Apache prox in between.
I am not a programmer but I can follow instruction, if you need anything else let me know.
Stefan this has been driving me nuts for a while now so any help you can give would be more than appreciated.
Cheers,
Lance
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