|To:||Stewart Smith <stewart@xxxxxxxxxxxxxxxx>|
|Subject:||Re: XFS use within multi-threaded apps|
|From:||Angelo McComis <angelo@xxxxxxxxxxx>|
|Date:||Wed, 20 Oct 2010 08:00:47 -0400|
Stewart, and others:|
On Tue, Oct 19, 2010 at 12:24 AM, Stewart Smith <stewart@xxxxxxxxxxxxxxxx> wrote:
I have been running iozone benchmarks, both head to head ext3 versus XFS, single LUN, default mkfs options, etc. And the short answer is XFS wins hands down on writes and random writes. Ext3 wins a couple of the other tests, but not by nearly the margin that XFS wins on the other ones. That was the KB/sec tests. The IOPS test was even more telling, and showed XFS winning by orders of magnitudes on a few tests, and being close or a tie on the ones that it didn't win. I took two SAN luns and ran local FS versus SAN-presented (this is FC, attached to IBM DS8k storage), and ran the tests there. When done with the head to head tests, I concatenated the LUNS to make a RAID 0 / simple 2-stripe set, and ran the tests some more.
I can't say that the numbers make a lot of sense, since it's a 4gbit FC connection
Well - I mentioned it above. Their current recommendation for Linux is to stick with ext3... and for big file/big IO operations, switch to ext4. And we had a meeting wherein we had a discussion that went like "well, ext3 has problems whenever the kernel journal thread wakes up to flush under heavy I/O, and ext4
is not available to us..." and Dave Chinner on an earlier post regarding the maturity level of ext4 and its present status.
I have been able to schedule a meeting with the folks at my vendor, on the database software side. Aside from the questions I have, points to make, etc., I'm curious if there's anything else, based on anyone here's input, I should be asking them? This is a pretty grand opportunity to sit down and grill them.
Thanks to everyone who participates on this list - you are all a great resource and a perfect example of what the open source community is all about.
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