[stgt] [PATCH 0/0] Allow creating a SBC jukebox

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Sat Jan 28 21:54:29 CET 2012

On Sat, 28 Jan 2012 14:28:41 +1100
Ronnie Sahlberg <ronniesahlberg at gmail.com> wrote:

> 1, This allows creating a SBC device without any backing store. I.e. no media loaded yet.
> It automatially forces such devices to be removable==1  and online==0 (no media loaded)
> 2, Add a new option to SMC so that you can force a storage elemet slot to become Empty.
> 3, Now, This is the funky stuff this has all been leading up to:
> Add documentation/script to create a SBC jukebox.
> This jukebox (when used ontop of BTRFS) can take snapshots of a different file
> (a file used to be exported as a normal SBC LUN thought a different target)
> that file can be snapshotted regularely via a cronjob.
> All x most recent snbapshots are then exported via a dedicated snapshot-target when an
> initiator can attach, pich which nsnapshot it wants to use (using MTX) and then access
> the content of the snapshot.
> i.e.
> You export a SBC LUN to an initiator.
> Then you use this snapshot script to create regular snapshots of that SBC device.
> These snapshots are then exported with a mediachanger through a different target to different initiators.
> Those other initiators can now access these point in time snapshots of the production LUN.

Shapshots are exported in read-only mode, right?

Anyway, the feature sounds really cool. You should talk about it at
a conference or post an article at a popular web site :)

Merged, thanks a lot!

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