[zfs-discuss] best practice to pass zfs volume to qemu/kvm

Gordan Bobic gordan.bobic at gmail.com
Tue Feb 16 07:22:44 EST 2016

On Tue, Feb 16, 2016 at 11:52 AM, thibaut noah <thibaut.noah at gmail.com>

> Hum, i remember reading somewhere that compression should have 4cores or
> something like this.

Nowhere near. LZ4 is close enough to free in terms of CPU hit that the
recommendation is to enable it for everything except file systems with
incompressible data (e.g. compressed media libraries).

> Basically using the redundancy of the mirror to remove disks without
> loosing datas, creating zvol on the disk remove from the mirror, put all
> datas to the zvol and then recreate redundancy and voila.

If you mean to use this to create a backup server, that would work. But if
you mean to plug the disk you removed back into the primary server, you
would have to erase it before re-adding it as a mirror, and then resilver
all of the data to it.
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