That seemed to work just fine, it now averages ~205MB/s read thanks.
Judd
Bernd Schubert wrote:
On Friday 04 May 2007 15:40:37 Judd Tracy wrote:
I am trying to bring up a small file server and am noticing some serious
performance issues when using LVM. I created a software raid /dev/md0
which I can read at ~195MB/s using the raw raid device, but as soon as I
put LVM on top of it the read speeds drop to ~95MB/s using a raw lvm
partition without a filesystem. When I use and xfs filesystem on top of
the lvm partition it drops down to ~40MB/s. This seems like a
processing power issue, but the machine is a dual processor opteron
system with 4GB of ram in it. Does anyone have some insight into why I
might be having such problems with the system.
try something like this:
blockdev --setra 8192 /dev/{volumegroup}/{logical_volume}
You should also try smaller and larger numbers.
Hope it helps,
Bernd
_______________________________________________
Beowulf mailing list, Beowulf@beowulf.org
To change your subscription (digest mode or unsubscribe) visit
http://www.beowulf.org/mailman/listinfo/beowulf
