[CentOS] Re: Hardware RAID Controller -- not a "bug"
Joshua Baker-LePain
jlb17 at duke.edu
Wed May 11 14:58:45 UTC 2005
On Wed, 11 May 2005 at 3:06pm, Chris Croome wrote
> On Wed 11-May-2005 at 08:40:33AM -0500, Bryan J. Smith wrote:
> >
> > The 3Ware 9000 series adds a good amount of DRAM for more
> > buffering operations, such as RAID-5 writes. But they are new,
> > and the drivers are still maturing.
>
> Yeah...
>
> FWIW there was a thread last month on fedora-devel:
>
> - 3w-9xxx module version in FC4
> https://www.redhat.com/archives/fedora-devel-list/2005-April/thread.html#00872
>
> I thought this comment was interesting:
>
> We never use these systems for high usage scenarios like a
> database server or sometimes even a home directory server. Nearline
> backup and slow storage is what we consider them useful for.
>
> https://www.redhat.com/archives/fedora-devel-list/2005-April/msg00886.html
I'm in the midst of testing a dual 9500-12 based system, and I've got all
sorts of results (I posted tiobench numbers for XFS and ext3 recently).
I've been playing with IOR
<http://www.llnl.gov/asci/purple/benchmarks/limited/ior/>,
<ftp://ftp.llnl.gov/pub/siop/ior/> for the past couple of days. This is
the output from a sample run across 10 clients (NFS over tcp,
wsize=rsize=32768, centos-3 clients, centos-4 server):
Command line used: /home/jlb/src/IOR-2.8.4/src/C/IOR -F -W -R -b 40m -t 4m -s 103 -e
Participating tasks: 10
Summary:
api = POSIX
test filename = testFile
access = file-per-process
clients = 10 (1 per node)
repetitions = 1
xfersize = 4 MiB
blocksize = 40 MiB
aggregate filesize = 40.23 GiB
Lustre stripe size = Use default
stripe count = Use default
access bw(MiB/s) block(KiB) xfer(KiB) open(s) wr/rd(s) close(s) iter
------ --------- ---------- --------- -------- -------- -------- ----
write 25.92 40960 4096 0.067203 1589.32 78.92 0
read 208.72 40960 4096 0.093569 197.39 191.23 0
Note that the server is dual homed, with half of the clients accessing
each address -- thus the read number (yes, gigabit everywhere). For that
test, the server was running XFS. Doing the same test with ext3 the write
number is slightly higher (~30 MiB/s) and the read number slightly lower
(~190MiB/s).
Just putting it out there.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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