Jim Kusznir wrote:
Hi all:
I've been trying to track down some performance problems with my pvfs2
system on my HPC cluster. Here's my system arch:
I have 3 dedicated I/O nodes, each are identical Dell PowerEdge 1950's
with PERC 6/e cards attached to a 15-disk MD1000 that has about 9.8TB
of storage after RAID-6'ing it.
Each I/O node has both of its Gig-E interfaces connected to the
cluster's switch and bonded together (bond0). The systems are running
CentOS 5 and the RAID is formatted with XFS.
bonnie++ on one of the raid disk (locally) reports:
Getting more or less decent I/O for more or less average applications it
helps to export the pvfs filesystem over nfs.
Let me explain, playing a video with mplayer from the pvfs file-system
is impossible, it stop/starts continuously, not useable.
If pvfs is exported and play the same file via the nfs-mount it plays
OK. It's a matter of the 'right' buffering for that 'average'
application, which nfs in this case does, that makes the difference in
this case.
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