On 06/04/2011 01:38, Stuart D. Gathman wrote:
On Wed, 6 Apr 2011, Jonathan Tripathy wrote:
pvcreate /dev/hdb7
vgextend /dev/hdb7
Then, every time I create a new customer LV, I would do:
lvcreate -nNewCustomerLV -L20G vg0 /dev/md3
Then, every time I wanted to create a snapshot:
lvcreate -L20G -s -n data_snap /dev/vg0/NewCustomerLV /dev/hdb7
Is that correct? No Leakage? And no zeroing needed?
Correct. Except vgextend needs to specify a VG. And you still need
to zero a
customer LV before removing it. The PV reserved for snapshots
approach only
avoids the need to zero snapshots.
Excellent! Cake for all! :)
I wonder if there is an elegant way to automate things like this via
"allocation policies" or similar in the metadata.
Indeed, there does seem to be some scope here for a code feature request
as this does seem like an aweful lot of work for something that could
very easily be overlooked. Every book or article I've read about hosting
seems to never mention anything about zeroing....
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