[PVE-User] sparse and compression
miguel_3_gonzalez at yahoo.es
Mon Dec 11 15:34:37 CET 2017
On 12/11/17 3:29 PM, Fabian Grünbichler wrote:
> On Mon, Dec 11, 2017 at 03:23:34PM +0100, Miguel González wrote:
>>>> Can I change a zpool to sparse on the fly or do I need to turn off all
>>>> VMs before doing so?
>>> sparse will only affect newly created volumes. you can "convert" sparse
>>> volumes to fully reserved ones and vice versa manually though.
>> how can I convert manually from non-sparse to sparse? Creating a new
>> zpool and copy disk with dd? Or any other easier way?
> (un)set the reservations appropriately. like I said, "sparse" is
> entirely virtual for ZFS, the only difference is whether the full size
> is reserved upon creation or not.
from Andreas comment maybe i should look more into change blocksize.
>>>> Why a virtual disk shows as 60G when originally It was 36 Gb in raw format?
>>>> NAME USED AVAIL REFER MOUNTPOINT
>>>> rpool/data/vm-102-disk-1 60.0G 51.3G 20.9G -
>>> wild guess - you are using raidz of some kind? ashift is set to 12 /
>> Yes, raid1
>> Thanks for your promptly reply!
> raid1 (aka mirror)? or raidZ-1 ? those are two very different things ;)
from zfs perspective is called mirror-0 (not softraid underneath):
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not
the features. See zpool-features(5) for details.
scan: scrub repaired 0B in 0h39m with 0 errors on Sun Dec 10 02:03:43 2017
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
sda2 ONLINE 0 0 0
sdb2 ONLINE 0 0 0
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