"df -h" shows less snapshots than "snap delta"

From: Borzenkov, Andrey (Andrey.Borzenkov@fujitsu-siemens.com)
Date: Thu May 22 2008 - 04:18:22 EDT

  • Next message: Stephen C. Losen: "Re: "df -h" shows less snapshots than "snap delta""

    I am rather puzzled.

    cn1:~ # rsh filer df -h vol1
    Filesystem total used avail capacity Mounted on
    /vol/vol1/ 2448GB 776GB 1671GB 32% /vol/vol1/
    snap reserve 612GB 158GB 453GB 26% /vol/vol1/..

    So according to this we have 156GB worth of snapshots. So far so good.

    cn1:~ # rsh filer snap delta vol1

    Volume vol1
    working...

    ...

    Summary...

    From Snapshot To KB changed Time Rate (KB/hour)
    --------------- -------------------- ----------- ------------ --------------
    Oldest_snap Active File System 265800060 14d 09:08 770120.583

    Oops. I would expect df -h to show *more* than snap delta (due to the fact that we have more intermediate snapshots); but how comes that - apparently having 260GB worth of snapshot data - I only see 158GB in space accounting?

    I am likely missing something obvious. Hmm ... is it possible that "snap delta" accounts for both changed *and* new data while "df -h" accounts for *changed* data only? Looks plausible...

    С уважением / With best regards / Mit freundlichen Grüβen 

    ---
Andrey Borzenkov
Senior system engineer

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