On Mon, 11 Jun 2007, Dexter Filmore wrote:
On Monday 11 June 2007 14:47:50 Justin Piszcz wrote:
On Mon, 11 Jun 2007, Dexter Filmore wrote:
I recently upgraded my file server, yet I'm still unsatisfied with the
write speed.
Machine now is a Athlon64 3400+ (Socket 754) equipped with 1GB of RAM.
The four RAID disks are attached to the board's onbaord sATA controller
(Sil3114 attached via PCI)
Kernel is 2.6.21.1, custom on Slackware 11.0.
RAID is on four Samsung SpinPoint disks, has LVM, 3 volumes atop of each
XFS.
The machine does some other work, too, but still I would have suspected
to get into the 20-30MB/s area. Too much asked for?
Dex
What do you get without LVM?
Hard to tell: the PV hogs all of the disk space, can't really do non-LVM
tests.
You can do a read test.
10gb read test:
dd if=/dev/md0 bs=1M count=10240 of=/dev/null
What is the result?
I've read that LVM can incur a 30-50% slowdown.
Justin.
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