Open Stack

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:zaitcev at 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.kotwani at 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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