* [linux-lvm] Howto get real size of thinpool-snap?
@ 2015-07-15 12:47 Oliver Rath
2015-07-15 17:51 ` Zdenek Kabelac
0 siblings, 1 reply; 2+ messages in thread
From: Oliver Rath @ 2015-07-15 12:47 UTC (permalink / raw)
To: LVM general discussion and development
Hi list,
if I create a snapshot of a volume in a thinpool, first only metadata
need space. Later, through copy-on-write, the real needed size grows. Is
it possible to get this size?
Tfh!
Oliver
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [linux-lvm] Howto get real size of thinpool-snap?
2015-07-15 12:47 [linux-lvm] Howto get real size of thinpool-snap? Oliver Rath
@ 2015-07-15 17:51 ` Zdenek Kabelac
0 siblings, 0 replies; 2+ messages in thread
From: Zdenek Kabelac @ 2015-07-15 17:51 UTC (permalink / raw)
To: LVM general discussion and development
Dne 15.7.2015 v 14:47 Oliver Rath napsal(a):
> Hi list,
>
> if I create a snapshot of a volume in a thinpool, first only metadata
> need space. Later, through copy-on-write, the real needed size grows. Is
> it possible to get this size?
>
When you access thin-pool kernel metadata - you could write your own tool
to parse i.e. thin_dump output and calc all info you want.
There is no 'runtime' info (since it would be quite expensive to maintain such
info all the time).
Currently lvm2 doesn't support 'life' access to running thin-pool,
but you may eventually use dmsetup message to take snapshot and access this
info runtime (since kernel target supports this).
Zdenek
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2015-07-15 12:47 [linux-lvm] Howto get real size of thinpool-snap? Oliver Rath
2015-07-15 17:51 ` Zdenek Kabelac
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