[linux-lvm] Any way to speed up activation of volumes with snapshots?
chris.friesen at windriver.com
Tue Sep 15 23:03:23 UTC 2015
On 09/14/2015 12:05 PM, Chris Friesen wrote:
> I'm running a 3.10 kernel with LVM 2.02.95.
> I'm running into a problem where activating snapshots can take quite a long
> time, roughly one minute per 25GB of delta between the snapshot and the origin
> volume. (See below for my test procedure.)
As a side question, currently we have a script which runs "vgchange -ay <vg>",
which will activate the VG.
This script appears to activate the LVs within the VG serially rather than in
parallel. Does it do any processing to determine in which order to activate the
The reason I ask is that we have an overall timeout on the activate phase, after
which we'll put any un-activated LVs into an error state. It would be a shame
to try to activate a snapshotted LV first, and then timeout without activating
any of the non-snapshotted LVs.
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