On 12/10/2013 03:23 PM, Kotwani, Mukul wrote:
A new piece of data..
We used the disable_fallocate configurable on Ubuntu, and the numbers do
reduce, but they are nowhere near the numbers for Redhat (5.8).
As an example, for a specific test:
PUT for Ubuntu, default parameters: ~140 ops/sec
PUT for Ubuntu, disable_fallocate=true: ~100 ops/sec
PUT for Redhat 5.8, default parameters: ~15 ops/sec
Has anyone seen this? We are not able to find anything that can
explain this kind of discrepancy. FYI, this is the same hardware(we
are switching between Ubuntu and RH, to keep things the same) and
software(Swift and xfs, same versions for both), same ring
configuration, same test scripts. It seems like Ubuntu is far ahead,
and we don't have any root cause ATM. PUTs are written though to the
disk and not cached, so I am not sure what to attribute this to.
Are RH 5.8 (2.6.32 with assorted backports) and what you later say is
Ubuntu 13.04 (3.8 kernel?) using the same I/O scheduler in their drivers?
rick jones
Has anyone run Swift on RH and done comparisons with Ubuntu?
Any help/pointers would be great!
Thanks,
Mukul
-----Original Message-----
From: Kotwani, Mukul
Sent: Thursday, December 05, 2013 6:44 PM
To: Pete Zaitcev
Cc: OpenStack Mailing List
Subject: Re: [Openstack] [Swift] Swift on RHEL
Thanks Pete!
We were using Grizzly, which is over a release old, with Folsom Keystone for
RHEL. So not recent at all. Is there something that would be missing in RHEL5.x
which would cause performance issues? I saw some references to fallocate, but
not much beyond that. Is this something you would expect to see?
Which was the first RHEL release was Swift supported on officially? I tried to
find a support matrix or supportable platforms but could not find anything..
Mukul
-----Original Message-----
From: Pete Zaitcev [mailto:zait...@redhat.com]
Sent: Thursday, December 05, 2013 4:36 PM
To: Kotwani, Mukul
Cc: OpenStack Mailing List
Subject: Re: [Openstack] [Swift] Swift on RHEL
On Thu, 5 Dec 2013 21:19:49 +0000
"Kotwani, Mukul" <mukul.g.kotw...@hp.com> wrote:
Has anyone used and/or deployed RHEL (5.8) with Swift?
I was also looking for a "Supported platforms" for Swift, and I could
not find it.
I don't think an RDO for RHEL 5.x ever existed. First packages were built a
year after RHEL 6 GA shipped. The oldest build in Koji is
openstack-swift-1.0.2-5.fc15 (a community build by Silas), and the oldest RHOS
build is openstack-swift-1.4.8-2.el6 from 2012.
Frankly I'm surprised you managed to get it running at all. (Which Swift
release is that, BTW? We even require PBR nowadays.)
I dimly remember bothering with XFS for RHEL 5, but it was so long ago that I
cannot even remember if I got that cluster to do anything useful.
-- Pete
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