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| Log File Sizes |
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| Simon McAlister |
 Posted: Mon Jul 05, 2004 7:25 pm Post subject: Log File Sizes |
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Novice
Joined: 05 May 2004
Posts: 11
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I need some help sizing logs.
My questions are
1. How much logging overhead is involved for a persistent put?
2. How much log space does a get of persistent message take (I am assuming that it doesn't depend on message size)?
3. Here is the calculation I am making for the log size: Does it look correct:?
For each channel: Batchsz * (Maximum Message Length + logging overhead)
For each queue: (Maximum Message Length + logging overhead)
We have each message in a single transaction and only one application accessing a queue at a time.
Thanks for your time. |
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| fjb_saper |
| Posted: Tue Jul 06, 2004 4:12 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Hi Simon
| Quote: |
| 2. How much log space does a get of persistent message take (I am assuming that it doesn't depend on message size)? |
Sorry but for the log, size does matter. The persistent messages will have to be logged.
The way we went about it was to analyze the traffic by message size and frequency. Then check how fast the logs roll over (circular logging) for low size, low volume, and how fast they roll over for big size high volume.
Depending on that observation and on total volume a day we sized our logs to archive on average one log a day (50 MB). That is for production.
In dev we are running with 10MB and when we need archiving we just get a lot more files.
Hope it helps.
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| PeterPotkay |
| Posted: Tue Jul 06, 2004 4:46 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Simon, if you make the circular logs as big as possible, you will only use up about 4.5 GIG. Nowadays, almost any server has easily that amount to spare. If yours does also, just make the logs as big as possible and spare yourself the time of trying to figure out how big your logs should be to be juuuuust big enough. And spare yourself the headache when you go over that self imposed limit eventually anyway.
_________________
Peter Potkay
Keep Calm and MQ On |
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