On Sat, Mar 30, 2013 at 02:12:36PM -0500, Stan Hoeppner wrote: > On 3/29/2013 3:27 PM, Ben Myers wrote: > > Hi Jan, > > > > On Thu, Mar 28, 2013 at 11:30:01PM -0400, Jan Perci wrote: > >> Back to XFS, in this context, is there any benefit in tuning some > >> parameters to get better performance, or will it all just be overshadowed > >> by poor performance of the VMDKs that tuning isn't worthwhile? > > > > At least get your stripe unit and width correct. > > http://xfs.org/index.php/XFS_FAQ#Q:_How_to_calculate_the_correct_sunit.2Cswidth_values_for_optimal_performance > > Is this really a good idea given that XFS sits atop a virtual disk which > consists of multiple concatenated 2TB sparse files sitting on the VMFS > filesystem, which, IIRC, has a 1MB sector size? Thus can one rely on > XFS being able to properly align to the physical RAID stripe, even if > the math is done 'properly' (if that's even possible here)? No, because VMFS doesn't do any specific alignment to the underlying storage geometry. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
