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06-25-2004 11:06 AM
06-25-2004 11:06 AM
Disk Utilization is very high
there are 4 nfsd processes who had Disk IO Rate between 55/34 to 65/35
We are using this system as a NFS server also. Is this a NFS performance problem?
How can I reduce DISK Utilization or there is any other tool to drill down this problem
I have attached the snapshot of Glance
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06-25-2004 11:10 AM
06-25-2004 11:10 AM
Re: Disk Utilization is very high
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06-25-2004 11:18 AM
06-25-2004 11:18 AM
Re: Disk Utilization is very high
http://docs.hp.com/hpux/onlinedocs/1435/NFSPerformanceTuninginHP-UX11.0and11iSystems.pdf
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06-25-2004 02:57 PM
06-25-2004 02:57 PM
Re: Disk Utilization is very high
The disk I/O rate is actually low for typical disks. Since the NFS protocol isn't nearly as fast as your disks, you can probably improve performance a bit by increasing the number of nfsd processes in the file /etc/rc.config.d/nfsconf. There is a diminishing return as you add more nfsd processes. 16 is a good start, 32 might be a bit high and 64 may waste RAM and increase system overhead.
NFS is a very complex protocol to tune well and keep stable. Get a copy of Dave Olker's book on NFS performance for HP-UX: "Optimizing NFS Performance: Tuning and Troubleshooting NFS on HP-UX Systems" by Dave Olker
Bill Hassell, sysadmin
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06-25-2004 10:58 PM
06-25-2004 10:58 PM
Re: Disk Utilization is very high
I also have faced the same issue. I have done a single change maxdsize increased to 1gb. And the problem was solved. I don't know what was the real issue.
Regards
Sreejith M
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06-26-2004 07:07 AM
06-26-2004 07:07 AM
Re: Disk Utilization is very high
Regards
Tim
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06-27-2004 03:14 AM
06-27-2004 03:14 AM
Re: Disk Utilization is very high
If you cannot get the clients to use NFS v3, then you might consider exporting the filesystem(s) with the HP-specific async option. However, only do that if you are satisfied with the satbility of your server.
And if the disc(s) are indeed saturated and glance isn't simply being a triffle paranoid, there is always the option of getting more and/or faster discs.
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06-28-2004 01:49 AM
06-28-2004 01:49 AM