[linux-lvm] Reserve space for specific thin logical volumes
zdenek.kabelac at gmail.com
Mon Sep 11 10:35:35 UTC 2017
Dne 10.9.2017 v 00:04 Gionatan Danti napsal(a):
> Il 08-09-2017 12:35 Gionatan Danti ha scritto:
>> Hi list,
>> as by the subject: is it possible to reserve space for specific thin
>> logical volumes?
>> This can be useful to "protect" critical volumes from having their
>> space "eaten" by other, potentially misconfigured, thin volumes.
>> Another, somewhat more convoluted, use case is to prevent snapshot
>> creation when thin pool space is too low, causing the pool to fill up
>> completely (with all the associated dramas for the other thin
> Hi all,
> anyone with some informations?
> Any comment would be very appreciated :)
Not sure for which information are you looking for ??
Having 'reserved' space for thinLV - means - you have to add more space
to this thin-pool - there is not much point in keeping space in VG,
which could be only used for extension of particular LV ??
What we do have thought is 'shard' "_pmspare' extra space for metadata
recovery, but there is nothing like that for data space (and not even planned).
There is support for so-called- fully-provisioned thinLVs withing thin-pool
in-plan, but that probably doesn't suit your needs.
The first question here is - why do you want to use thin-provisioning ?
As thin-provisioning is about 'promising the space you can deliver later when
needed' - it's not about hidden magic to make the space out-of-nowhere.
The idea of planning to operate thin-pool on 100% fullness boundary is simply
not going to work well - it's not been designed for that use-case - so if
that's been your plan - you will need to seek for other solution.
(Unless you seek for those 100% provisioned devices)
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