Open Stack

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.

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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