[linux-lvm] Progress on LVM2 snapshots

[Alasdair G Kergon]

On Thu, Jul 28, 2005 at 01:44:00PM -0400, Ming Zhang wrote:
> 1) very hard to solve technically. or
> 2) not so easy but doable, just no time and human resource?
 
The hardest part of the fix involves changing the sequence of 
device-mapper ioctls that LVM2 uses, and that's a couple of weeks' 
development work, now pencilled into the RHEL4 Update 3 timescale.

In the meantime, you can apply the snapshot patches in the -udm
tree and use 'dmsetup' manually to activate and deactivate snapshots
when lvm2 fails.

Patches 8 and 9 at:
  ftp://sources.redhat.com/pub/dm/patches/2.6-unstable/2.6.12-rc2/2.6.12-rc2-udm1/
(Further patches are needed, but those two plus correct dmsetup use
should avoid machine lockups.)

Alasdair
-- 
agk at redhat.com