[OpenAFS] vos release not as "smart" as I thought - or is this a not implemented feature?

[Benjamin Kaduk]

Did you see
https://lists.openafs.org/pipermail/openafs-info/2019-September/042865.html
?

-Ben

On Mon, Nov 25, 2019 at 02:17:29PM +0100, Harald Barth wrote:
> 
> I thought that vos release was smart and only did make a clone +
> transfer if the RW had changed compared to the status of the RO
> clone(s).
> 
> This seems not to be the case and I get a clone plus transfer
> (incremental, I guess, but nevertheless) even if the RW was quiet
> and untouched for some time.
> 
> Example:
> 
> root@bananshake:~# vos exa H.haba.android
> H.haba.android                    536916074 RW    3062302 K  On-line
>     bananshake.stacken.kth.se /vicepb 
>     RWrite  536916074 ROnly  536916075 Backup          0 
>     MaxQuota   50000000 K 
>     Creation    Mon Apr  1 08:57:31 2019
>     Copy        Mon Nov 25 10:49:14 2019
>     Backup      Mon Nov 25 01:17:02 2019
>     Last Access Mon Nov 25 10:57:40 2019
>     Last Update Mon Nov 25 10:57:40 2019
>     11 accesses in the past day (i.e., vnode references)
> 
>     RWrite: 536916074     ROnly: 536916075 
>     number of sites -> 3
>        server bananshake.stacken.kth.se partition /vicepb RW Site 
>        server bananshake.stacken.kth.se partition /vicepb RO Site 
>        server vaniljshake.stacken.kth.se partition /vicepb RO Site 
> 
> This volume was last touched 10:57:40 and now it's 14:11:33 and I do two
> vos release:
> 
> root@bananshake:~# vos rele H.haba.android  -local -verb
> 
> H.haba.android 
>     RWrite: 536916074     ROnly: 536916075 
>     number of sites -> 3
>        server bananshake.stacken.kth.se partition /vicepb RW Site 
>        server bananshake.stacken.kth.se partition /vicepb RO Site 
>        server vaniljshake.stacken.kth.se partition /vicepb RO Site 
> This is a complete release of volume 536916074
> Re-cloning permanent RO volume 536916075 ... done
> Getting status of parent volume 536916074... done
> Starting transaction on RO clone volume 536916075... done
> Setting volume flags for volume 536916075... done
> Ending transaction on volume 536916075... done
> Replacing VLDB entry for H.haba.android... done
> Starting transaction on cloned volume 536916075... done
> Updating existing ro volume 536916075 on vaniljshake.stacken.kth.se ...
> Starting ForwardMulti from 536916075 to 536916075 on vaniljshake.stacken.kth.se (as of Mon Nov 25 10:57:38 2019).
> updating VLDB ... done
> Released volume H.haba.android successfully
> root@bananshake:~# vos rele H.haba.android  -local -verb
> 
> H.haba.android 
>     RWrite: 536916074     ROnly: 536916075 
>     number of sites -> 3
>        server bananshake.stacken.kth.se partition /vicepb RW Site 
>        server bananshake.stacken.kth.se partition /vicepb RO Site 
>        server vaniljshake.stacken.kth.se partition /vicepb RO Site 
> This is a complete release of volume 536916074
> Re-cloning permanent RO volume 536916075 ... done
> Getting status of parent volume 536916074... done
> Starting transaction on RO clone volume 536916075... done
> Setting volume flags for volume 536916075... done
> Ending transaction on volume 536916075... done
> Replacing VLDB entry for H.haba.android... done
> Starting transaction on cloned volume 536916075... done
> Updating existing ro volume 536916075 on vaniljshake.stacken.kth.se ...
> Starting ForwardMulti from 536916075 to 536916075 on vaniljshake.stacken.kth.se (as of Mon Nov 25 10:57:38 2019).
> updating VLDB ... done
> Released volume H.haba.android successfully
> root@bananshake:~# 
> 
> So why is there any cloning/replicatin taking place at all when it
> could be determined that the RO clones are up to date?
> I think all relevant versions are 1.6.20-2+deb9u2.
> 
> Feel free to run vos commands to get further details.
> 
> Thanks,
> Harald.
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