Btrfs devel - Jul 2013 - mkfs.btrfs out of memory failure on lvm2 thinp volume

https://bugzilla.redhat.com/show_bug.cgi?id=984236

kernel-3.10.0-1.fc20.x86_64

Should it be possible to mkfs.btrfs on a virtual LV backed by LVM thinp? I can
successfully create an XFS fs on the same virtual device. The virtual LV is 16TB
in size, I haven''t tried anything smaller yet to see if that''s
the problem. There is a dmesg attached to the bug report.

Just because it works with mkfs.xfs doesn''t mean it''s sane.
The end goal is testing glusterfs in two VMs, each with two bricks. One VM will
use XFS bricks and the other VM will use btrfs bricks. So it''s not like
I''m in any sort of real trouble. At the moment, this is all being done
on baremetal, not within VMs (there are no VMs yet).


Chris Murphy--
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On Jul 13, 2013, at 2:59 PM, Chris Murphy <lists@colorremedies.com> wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=984236
> 
> kernel-3.10.0-1.fc20.x86_64
> 
> Should it be possible to mkfs.btrfs on a virtual LV backed by LVM thinp? I
can successfully create an XFS fs on the same virtual device. The virtual LV is
16TB in size, I haven''t tried anything smaller yet to see if
that''s the problem. There is a dmesg attached to the bug report.
> 
> Just because it works with mkfs.xfs doesn''t mean it''s
sane. The end goal is testing glusterfs in two VMs, each with two bricks. One VM
will use XFS bricks and the other VM will use btrfs bricks. So it''s not
like I''m in any sort of real trouble. At the moment, this is all being
done on baremetal, not within VMs (there are no VMs yet).
Nevermind. It also happens with xfs, just not every time. A VM pointed to a 16TB
qcow2 file doesn''t exhibit this issue with either mkfs. So I think this
may be an LVM thinp related bug.


Chris Murphy--
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