[libvirt-users] using LVM thin pool LVs as a storage for libvirt guest

[Vasiliy Tolstov]

2017-11-07 13:46 GMT+03:00 Jan Hutař <jhutar at redhat.com>:
> Do you have some comparasion of IO performance on thin pool vs. qcow2
> file on fs?
>

I don't have actual data (i'm switched from lvm thinp is about 1-1.5
year ago. But when we test it - sometimes qcow2 gave us better
performance when raw on fs and thin volume. If you increase number of
running vm on the same time performance of lvm thinp lowering.

> In my case each VM would have its own thin volume. I just want to
> overcommit disk-space.
>

Yes, we do something like this, but if you lost time when thin pool
has no space - all you vm stopped and you can lost you data inside vm!
So overcommit and vm on thin pool is really dangerous.



Vasiliy Tolstov,
e-mail: v.tolstov at selfip.ru