Gurus needed to diagnose severe performance degradation Post: 302349752

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Top Forums UNIX for Advanced & Expert Users Gurus needed to diagnose severe performance degradation Post 302349752 by Scrutinizer on Tuesday 1st of September 2009 05:57:30 PM

09-01-2009

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I would tend to think your troubles are IO related as you state your system is slow while processing is low. The nose diving points to a severe bottleneck situation, perhaps when Oracle has trouble writing to its archived redo logs or there is reporting activity during the day.

I know that if you want to use Oracle on Netapp / NFS there are some very specific instructions/settings for NFS on both server (the Netapp) and client (your Fujitsu Server) that you have to follow really meticulously.

Also, I think it may be advisable to create a separate storage LAN of VLAN, so you are not interfering with other traffic, or maybe have separate segments and spread the storage over several NFS mountpoints to different segments. If possible I would implement Jumbo ethernet frames, to optimize sequential IO a bit (full table scans, index scans).

Your server appears to have room for many slow (dedicated) PCI slots, so I would tend to spread the load over the PCI-slots to reach the required bandwidth.

Just some thoughts.. good luck.

S.

Last edited by Scrutinizer; 09-01-2009 at 07:19 PM..

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LEARN ABOUT FREEBSD

nfsiod

NFSIOD(8)						    BSD System Manager's Manual 						 NFSIOD(8)

NAME

     nfsiod -- local NFS asynchronous I/O server

SYNOPSIS

     nfsiod [-n num_servers]

DESCRIPTION

     The nfsiod utility controls the maximum number of nfsiod kernel processes which run on an NFS client machine to service asynchronous I/O
     requests to its server.  Having nfsiod kernel processes improves performance but is not required for correct operation.

     The option is as follows:

     -n      Specify how many processes are permitted to be started.

     Without an option, nfsiod displays the current settings.  A client should allow enough number of processes to handle its maximum level of
     concurrency, typically four to six.

     If nfsiod detects that the running kernel does not include NFS support, it will attempt to load a kernel module containing NFS code, using
     kldload(2).  If this fails, or no NFS module was available, nfsiod exits with an error.

EXIT STATUS

     The nfsiod utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     nfsstat(1), kldload(2), nfssvc(2), mountd(8), nfsd(8), rpcbind(8)

HISTORY

     The nfsiod utility first appeared in 4.4BSD.

     Starting with FreeBSD 5.0, the utility no longer starts daemons, but only serves as a vfs loader and sysctl(3) wrapper.

BSD
								 December 26, 2009							       BSD