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Operating Systems AIX Slow NFS when cio/dio enabled Post 302589288 by zxmaus on Wednesday 11th of January 2012 08:17:35 AM
Old 01-11-2012
Hi,
dio is for JFS filesystems only - I doubt you are using jfs anywhere of your box - if you do that is part of your problem

for the cio part, - I am with Z80A - if you are using oracle, than you should use SETALL as oracle setting since Oracle 9.

If you are copying files into a cio mounted device, than thre is no filesystem buffering, as cio is switching it off. So if you copy anything, than you are saturating your disks. You are much better off, if you are mounting your filesystems without cio but with noatime options

Regards
zxmaus
 

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filesystem(7)						 Miscellaneous Information Manual					     filesystem(7)

NAME
filesystem - event signalling that filesystems have been mounted SYNOPSIS
filesystem [ENV]... DESCRIPTION
The filesystem event is generated by the mountall(8) daemon after it has mounted all filesystems listed in fstab(5). mountall(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with other activity. EXAMPLE
A service that wishes to be running once filesystems are mounted might use: start on filesystem SEE ALSO
mounting(7) mounted(7) virtual-filesystems(7) local-filesystems(7) remote-filesystems(7) all-swaps(7) mountall 2009-12-21 filesystem(7)
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