[ClusterLabs] Antw: Re: Performance of a mirrored LV (cLVM) with OCFS: Attempt to monitor it

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Mon Apr 25 06:40:31 EDT 2016

>>> Lars Marowsky-Bree <lmb at suse.com> schrieb am 25.04.2016 um 12:12 in
<20160425101236.GD10040 at suse.de>:
> On 2016-04-25T10:10:38, Ulrich Windl <Ulrich.Windl at rz.uni-regensburg.de>
> Hi Ulrich,
> I can't really comment on why the cLVM2 is slow (somewhat surprisingly,
> because flock is meta-data only and thus shouldn't even be affected by
> cLVM2, anyway ...).
> But on the subject of performance, you're quite right - we know that
> cLVM2 is not fast enough, thus there has been an effort to make md raid
> cluster aware (especially RAID1). cluster-md is almost completely
> merged upstream and coming to your favorite enterprise distribution very
> soon too ;-)


that's good news.

As we've made good experience with MD-RAID, I really thought about having an
MD-RAID on one node and export that RAID via iSCSI to all the nodes that need
access. Unfortunately I cannot compare performance ahead of time 8-(


> Regards,
>     Lars
> -- 
> Architect SDS, Distinguished Engineer
> SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 
> 21284 (AG Nürnberg)
> "Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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