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Hardware
Filesystems, Disks and Memory
EXT3 Performance tuning
Post 73994 by malcom on Tuesday 7th of June 2005 06:03:08 AM
06-07-2005
EXT3 Performance tuning
Hi all,
long time ago I posted something, but now, it is needed again
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
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
long time ago I posted something, but now, it is needed again
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
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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LEARN ABOUT REDHAT
rpc.nfsd
rpc.nfsd(8) System Manager's Manual rpc.nfsd(8) NAME
rpc.nfsd - NFS server process SYNOPSIS
/usr/sbin/rpc.nfsd [-p port] nproc DESCRIPTION
The rpc.nfsd program implements the user level part of the NFS service. The main functionality is handled by the nfsd.o kernel module; the user space program merely starts the specified number of kernel threads. The rpc.mountd server provides an ancially service needed to satisfy mount requests by NFS clients. OPTIONS
-p port specify a diferent port to listen on for NFS requests. By default, rpc.nfsd will listen on port 2049. nproc specify the number of NFS server threads. By default, just one thread is started. However, for optimum performance several threads should be used. The actual figure depends on the number of and the work load created by the NFS clients, but a useful starting point is 8 threads. Effects of modifying that number can be checked using the nfsstat(8) program. SEE ALSO
rpc.mountd(8), exportfs(8), rpc.rquotad(8), nfsstat(8). AUTHOR
Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of others. 31 May 1999 rpc.nfsd(8)