On 01/25/2011 04:48 AM, Mathieu AVILA wrote
You're getting 40MB/s write speed and says that's fine? I get more
performance from a single SATA desktop drive. Your setup seems to suck
extremely somewhere.
It already starts with your dd speed. I started it on a virtualized VM
on an old, overloaded server and get:
# dd if=/dev/zero of=test.dd bs=1k count=1M
1048576+0 Datensätze ein
1048576+0 Datensätze aus
1073741824 Bytes (1,1 GB) kopiert, 10,9992 s, 97,6 MB/s
I would say this is melted with cache hit, isn't it ? (although I
agree it depends on the server's memory dedicated to FS cache)
A real cache hit on a real server would give me at least 500 MB/s
(actually I get something around 1 GB/s)
When it starts to be disk-constrained, on a standard SATA disk, I get
from 75 MB/s to 140 MB/s depending on the position of the AG I hit.
I agree, it should be a lot faster even on the LV's that are functioning
fine. The disk arrays and disks are new but the rest of the hardware is
pretty old, that might be part of the problem. It is a ProLiant DL385 G1.
------------------------------------------------------------------------
The information contained in this communication is intended
only for the use of the recipient(s) named above. It may
contain information that is privileged or confidential, and
may be protected by State and/or Federal Regulations. If
the reader of this message is not the intended recipient,
you are hereby notified that any dissemination,
distribution, or copying of this communication, or any of
its contents, is strictly prohibited. If you have received
this communication in error, please return it to the sender
immediately and delete the original message and any copy
of it from your computer system. If you have any questions
concerning this message, please contact the sender.
------------------------------------------------------------------------
_______________________________________________
xfs mailing list
xfs@xxxxxxxxxxx
http://oss.sgi.com/mailman/listinfo/xfs
