We've had pretty good performance from NFS except when we start to put a
lot of files on them. Beyond about 50,000 files in an NFS directory the
performance of the target file system starts to bog badly. We've pretty
well determined this is a function of the target file system checking
for duplicate names in the directory and has nothing to do with iOS.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of James Rich
Sent: Thursday, August 13, 2009 5:07 PM
To: midrange-l
Subject: NFS performance
I'm using NFS to mount a directory from a linux machine that I copy
savefiles to as part of our nightly backup. The savefiles add up to
about 12GB. I just copy the savefiles to the NFS mounted directory
using:
QSH CMD('cp /QSYS.LIB/BACKUPS.LIB/* /mnt/backups')
I ran it for the first time last night and was shocked to discover it
took about 12 1/2 hours to complete! I'm on v5r3m0. Is there a way to
get improved NFS performance on the iSeries?
James Rich
if you want to understand why that is, there are many good books on the
design of operating systems. please pass them along to redmond when
you're done reading them :)
- Paul Davis on ardour-dev
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