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Full Discussion: EXT3 Performance tuning
Special Forums Hardware Filesystems, Disks and Memory EXT3 Performance tuning Post 73994 by malcom on Tuesday 7th of June 2005 06:03:08 AM
Old 06-07-2005
EXT3 Performance tuning

Hi all,

long time ago I posted something, but now, it is needed again Smilie

Currently, I am handling with a big NFS Server for more than 200 clients, this sever has to work with 256 NFSDs. Because of this huge amount of NFSDs, there are thousands of small write accesses down to the disk and causing a high wait i/o Smilie

Now, i hope to be able to tune the ext3 filesystem in that way, that the wait i/o could be decreased, I even don't need to completely get rid of it...

Firstly I planed to move the journal to a different location, but because this is a shared disk within a HA failover configuration, both systems have to have the journal on the shared disk.
The next idea was to tune the fs via the commit rate within the fstab file, but during my tests I saw no performance increasement of the filesystem... the best performance I git was the default setting, which is every 5s.

So, I don't have a clue how to tune the fs further to decrease the wait i/o , do you have any ideas ?

Thanks in advance

Malcom
 

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QUOTAON(8)						      System Manager's Manual							QUOTAON(8)

NAME
quotaon, quotaoff - turn filesystem quotas on and off SYNOPSIS
quotaon [-v] filesystem ... quotaon [-v] -a quotaoff [-v] filesystem ... quotaoff [-v] -a DESCRIPTION
Quotaon announces to the system that disk quotas should be enabled on one or more filesystems. Quotaoff announces to the system that the specified filesystems should have any disk quotas diskquotas turned off. The filesystems specified must have entries in /etc/fstab and be mounted. Quotaon expects each filesystem to have a quota file named quotas located at the root of the associated file system. These defaults may be overridden in /etc/fstab. Available options: -a If the -a flag is supplied in place of any filesystem names, quotaon/quotaoff will enable/disable all the filesystems indi- cated in /etc/fstab to be read-write with disk quotas. -v Causes quotaon and quotaoff to print a message for each filesystem where quotas are turned on or off. FILES
quotas at the filesystem root with user quotas /etc/fstab filesystem table SEE ALSO
quota(1), setquota(2), fstab(5), edquota(8), quotacheck(8), repquota(8) HISTORY
The quotaon command appeared in 4.2BSD. 4.2 Berkeley Distribution January 21, 1996 QUOTAON(8)
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