[PVE-User] sparse and compression

Miguel González miguel_3_gonzalez at yahoo.es
Mon Dec 11 15:23:34 CET 2017

>>  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?

>>  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 /
> auto-detected?

Yes, raid1

Thanks for your promptly reply!


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