[zfs-discuss] ZFS on top of iSCSI on top of ZFS

Gordan Bobic gordan.bobic at gmail.com
Fri Jan 8 06:45:12 EST 2016

On 8 Jan 2016 11:59 am, kaazoo via zfs-discuss <zfs-discuss at list.zfsonlinux.org> wrote:
> Am 07.01.16 um 16:25 schrieb Markus Koeberl:
> > On Thursday 07 January 2016 09:51:41 kaazoo via zfs-discuss wrote:

> >> The iSCSI volumes have 128 KB blocksize, so ashift=17 is used.
> >> ZFS features like compression and snapshots are used here.
> > 
> > If I understand it right how compression is working you may not benefit with this settings.
> > Because of ashift=17 you cannot use smaller blocks than 128 KB and because of the max blocksize of 128 KB you never get bigger blocks.
> > So the only way to save space is if you get 128 KB of zeros I guess.

I'm pretty sure there is no such think as ashift=17 in ZFS. The maximum value is 13 (8KB).

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