On Fri, 10 Apr 2015 09:10:35 +1000 Dave Chinner <david@xxxxxxxxxxxxx> wrote: > On Fri, Apr 10, 2015 at 08:53:22AM +1000, Dave Chinner wrote: > > On Thu, Apr 09, 2015 at 06:20:26PM -0400, Joe Landman wrote: > > > > > > > > > On 04/09/2015 06:18 PM, Dave Chinner wrote: > > > >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. > > > >> > > > > > > [...] > > > > > > >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 ;) > > > > > > Thats the thing, it didn't mount, even when I used the device name > > > directly. > > > > Ok, that's interesting. Let me see if I can reproduce it locally. If > > you don't hear otherwise, tracing would still be useful. Thanks for > > the bug report, Joe. > > No luck - md doesn't allow the device to be activated on 4.0-rc7: > > $ sudo mdadm --version > mdadm - v3.3.2 - 21st August 2014 > $ uname -a > Linux test4 4.0.0-rc7-dgc+ #882 SMP Fri Apr 10 08:50:52 AEST 2015 x86_64 GNU/Linux > $ sudo wipefs -a /dev/vd[ab] > /dev/vda: 4 bytes were erased at offset 0x00001000 (linux_raid_member): fc 4e 2b a9 > /dev/vdb: 4 bytes were erased at offset 0x00001000 (linux_raid_member): fc 4e 2b a9 > $ sudo mdadm --create /dev/md20 --level=0 --metadata=1.2 --chunk=1152 --auto=yes --raid-disks=2 /dev/vd[ab] Weird. Works for me. Any messages in 'dmesg' ?? How big are /dev/vd[ab]?? NeilBrown > mdadm: RUN_ARRAY failed: Invalid argument > Problem may be that chunk size is not a power of 2 > $ cat /proc/mdstat > Personalities : [raid1] [raid10] [raid6] [raid5] [raid4] > unused devices: <none> > $ > > So I can't actually reproduce what you are seeing because MD doesn't > allow the device to be activated and so mdadm tears it back down. > > Cheers, > > Dave.
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