On 2012-11-13, at 4:59 PM, Christopher J. Walker wrote:On 13/11/12 18:49, Richard Henwood wrote:On Tue, Nov 13, 2012 at 12:33 PM, Christopher J. Walker wrote:In the Lustre 2.1 manual,http://wiki.whamcloud.com/display/PUB/Documentationhas a link titled Lustre Manual 2.1 - though in a row titled 2.xhttp://git.whamcloud.com/?p=fs/lustre-release.git;a=tree;f=lustre-iokit/mds-survey;hb=HEADIt doesn't seem to work on Lustre 1.8. Should it?No, mds-survey arrived with Lustre 2.2:http://wiki.whamcloud.com/display/PUB/Lustre+2.2I was hoping (obviously incorrectly) that whilst it arrived in 2.2, it would work with 1.8.The problem is that the mds-survey tool needs hooks in the Lustre kernel code in order to generate the metadata operations. While this is driven from userspace, the kernel hooks are not in Lustre 1.8.Cheers, AndreasWhat I'm actually trying to do is migrate an MDS to new hardware - andI'd like to perform some basic tests - partly to see if using LVM has asignificant performance impact.mds-survey appeals to me because you don't need any OSTs. I don't knowif a 'OST-free' performance setup is possible for your 1.8 testing -others may know differently?That's a clear advantage, and being a standard Lustre tool give some confidence too.Chris___Lustre-discuss mailing listLustre-discuss@lists.lustre.orghttp://lists.lustre.org/mailman/listinfo/lustre-discussCheers, Andreas--Andreas Dilger Whamcloud, Inc.Principal Lustre Engineer http://www.whamcloud.com/___
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