[linux-lvm] Snapshot behavior on classic LVM vs ThinLVM
zkabelac at redhat.com
Fri Apr 14 08:24:10 UTC 2017
Dne 14.4.2017 v 09:20 Gionatan Danti napsal(a):
> Il 13-04-2017 14:41 Xen ha scritto:
>> See, you only compared multiple non-thin with a single-thin.
>> So my question is:
>> did you consider multiple thin volumes?
> Hi, the multiple-thin-volume solution, while being very flexible, is not well
> understood by libvirt and virt-manager. So I need to pass on that (for the
> moment at least).
Well since recent versions of lvm2 (>=169 , even though they are marked as
exprimental) - do support script execution of a command for easier maintanence
of thin-pool being filled above some percentage.
So it should be 'relatively' easy to setup a solution where you can fill
your pool to i.e. 90% and if gets above - kill your surrounding libvirt,
and resolve missing resources (deleting virt machines..)
But it's currently impossible to expect you will fill the thin-pool to full
capacity and everything will continue to run smoothly - this is not going to
However there are many different solutions for different problems - and with
current script execution - user may build his own solution - i.e. call
'dmsetup remove -f' for running thin volumes - so all instances get 'error'
device when pool is above some threshold setting (just like old 'snapshot'
invalidation worked) - this way user will just kill thin volume user task, but
will still keep thin-pool usable for easy maintenance.
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