Real time logging: best practices and questions ?

I've 4 couples of DS 5.2p6 in MMR mode on Windows 2003.
Each server is configured with the default setting of "nsslapd-accesslog-logbuffering" enabled, and the log files are stored on a local file system, then later centrally archived thanks to a log sender daemon.
I've now a requirement from a monitoring tool (used to establish correlations/links/events between applications) to provide the directory
server access logs in real time.
At a first glance, each directory generates about 1,1 Mb of access log per second.
1)
I'd like to know if there're known best practices / experiences in such a case.
2)
Also, should I upgrade my DS servers to benefit from any log management related feature ? Should I think about using an external disk
sub-sytem (SAN, NAS ....) ?
3)
In DS 5.2, what's the default access logbuffering policy : is there a maximum buffer size and/or time limit before flushing to disk ? Is it configurable ?

Usually log-buffering should be enabled. I don't know of any customers who turn it off. Even if you do, I guess it should be after careful evaluation in your environment. AFAIK, there is no configurable limit for buffer size or time limit before it is committed to disk
Regarding faster disks, I had the bright idea that you could creating a ramdisk and set the logs to go there instead of disk. Let's say the ramdisk is 2gb max in size and you receive about 1MB/sec in writes. Say max-log-size is 30MB. You can schedule a job to run every minute that copies over the newly rotated file(s) from ramdisk to your filesystem and then send it over to logs HQ. If the server does crash, you'll lose upto a minute of logs. Of course, the data disappears after reboot, so you'll need to manage that as well. Sounds like fun to try but may not be practical.
Ramdisk on windows
[http://msdn.microsoft.com/en-us/library/dd163312.aspx]
Ramdisk on solaris
[http://wikis.sun.com/display/BigAdmin/Talking+about+RAM+disks+in+the+Solaris+OS]
[http://docs.sun.com/app/docs/doc/816-5166/ramdiskadm-1m?a=view]
I should ask, how realtime should this log correlation be?
Edited by: etst123 on Jul 23, 2009 1:04 PM

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