On 12/04/2013 11:34 AM, Ellison, Bob wrote: > A little off topic, but thought someone here would know off the top of their > head... > > I'm setting up a new glusterfs system. I have a hardware raid6 configured as > 10+2 with a 256K chunk size (so the partition being seen in Redhat is a > single LUN). I get a warning when I initialize it with XFS: > > [root@lab-ads1 ~]# mkfs.xfs -f -isize=512 -d su=256k,sw=10 /dev/mapper/c0 > mkfs.xfs: Specified data stripe width 5120 is not the same as the volume > stripe width 2048 >
You could check out 'blkid -i /dev/mapper/c0' to see what characteristics the dm device reports (and/or for the underlying block device, if accessible) and whether it corresponds to how the volume has been configured. Assuming a recent enough version, mkfs.xfs correlates minimum I/O size to stripe unit and optimal I/O size to stripe width. I'm not sure what the device mapper device represents here, but you'll probably want to make sure it is aligned as well. Brian > The mkfs seems to work fine (and hence why I characterize the message as a > warning). > > I've searched around and see this type of message all over the place. But > there's never a hint if this is an expected message for such a configuration > which can be safely ignored or if I'm severely misinterpreting the man page > and performance will suffer as these partitions fill up with data. > > Thanks in advance, > Bob > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://supercolony.gluster.org/mailman/listinfo/gluster-users > _______________________________________________ Gluster-users mailing list [email protected] http://supercolony.gluster.org/mailman/listinfo/gluster-users
