[OpenIndiana-discuss] All of a sudden I'm feeling stupid.... Where does the COW and the newly written data go for snapshots?

[Udo Grabowski (IMK)]

On 13/05/2015 09:20, Hans J. Albertsson wrote:
> This is what it looks like on the FreeNAS box
>
> NAME                             AVAIL   USED  USEDSNAP  USEDDS
> USEDREFRESERV  USEDCHILD
> Tank/cifs                        8.93T  1.45T     9.18M
> 1.45T              0          0
> Tank/cifs at transfer_prep              -  8.24M         - -
> -          -
> Tank/cifs at transfer1                  -   966K         - -
> -          -
> Tank/cifs at now                        -      0         - -
> -          -
> Tank/cifs at auto-20150513.0100-2w      -      0         - -
> -          -
>
> I'd like to see what data is to blame for the 966K reported for
> transfer1 as "USED"

These are usually access time updates, since the snapshot preserves
access times. We have a few Megs each day on heavily accessed data.
-- 
Dr.Udo Grabowski   Inst.f.Meteorology & Climate Research IMK-ASF-SAT
http://www.imk-asf.kit.edu/english/sat.php
KIT - Karlsruhe Institute of Technology           http://www.kit.edu
Postfach 3640,76021 Karlsruhe,Germany T:(+49)721 608-26026 F:-926026