On Thu, Apr 09, 2015 at 05:02:33PM -0400, Joe Landman wrote: > If I build an MD raid0 with a non power of 2 chunk size, it appears > that I can mkfs.xfs a file system, but it doesn't show up in blkid > and is not mountable. Yet, using a power of 2 chunk size, this does > work correctly. This is kernel 3.18.9. > > > For example, non-power of 2 chunk: > > root@unison:~# wipefs -a /dev/sdb > 4 bytes were erased at offset 0x1000 (linux_raid_member) > they were: fc 4e 2b a9 > root@unison:~# wipefs -a /dev/sda > 4 bytes were erased at offset 0x1000 (linux_raid_member) > they were: fc 4e 2b a9 > root@unison:~# mdadm --create /dev/md20 --level=0 --metadata=1.2 > --chunk=1152 --auto=yes --raid-disks=2 /dev/sd[ab] > mdadm: array /dev/md20 started. > > root@unison:~# mkfs.xfs /dev/md20 > log stripe unit (1179648 bytes) is too large (maximum is 256KiB) > log stripe unit adjusted to 32KiB > meta-data=/dev/md20 isize=256 agcount=50, > agsize=268435296 blks > = sectsz=512 attr=2, projid32bit=0 > data = bsize=4096 blocks=13164865984, imaxpct=5 > = sunit=288 swidth=576 blks > naming =version 2 bsize=4096 ascii-ci=0 > log =internal log bsize=4096 blocks=521728, version=2 > = sectsz=512 sunit=8 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > root@unison:~# blkid | grep xfs That looks more like a blkid or udev problem. try using blkid -p so that it doesn't look up the cache but directly probes devices for the signatures. strace might tell you a bit more, too. And if the filesystem mounts, then it definitely isn't an XFS problem ;) Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
