On Mon, 11 Jun 2007, Jon Nelson wrote:
On Mon, 11 Jun 2007, Justin Piszcz wrote:
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
eek! Make sure to use iflag=direct
with that otherwise you'll get cached reads and that will throw
the numbers off considerably.
Wow, makes a difference for faster devices. Does bonnie++ use
iflag=direct when benchmarking?
p34:~# dd if=/dev/md0 bs=1M count=1024 of=/dev/null iflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 15.0454 seconds, 71.4 MB/s
p34:~# dd if=/dev/md0 bs=1M count=1024 of=/dev/null
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 14.991 seconds, 71.6 MB/s
p34:~# dd if=/dev/md3 bs=1M count=1024 of=/dev/null iflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 3.08707 seconds, 348 MB/s
p34:~# dd if=/dev/md3 bs=1M count=1024 of=/dev/null
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.02948 seconds, 529 MB/s
p34:~#
p34:~# dd if=/dev/md3 bs=1M count=10024 of=/dev/null
10024+0 records in
10024+0 records out
10510925824 bytes (11 GB) copied, 17.7321 seconds, 593 MB/s
p34:~# sync
p34:~# dd if=/dev/md3 bs=1M count=10024 of=/dev/null iflag=direct
10024+0 records in
10024+0 records out
10510925824 bytes (11 GB) copied, 29.022 seconds, 362 MB/s
p34:~#
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