[stgt] [PATCH 1/1] Readonly disk LUNs

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Mon Apr 5 08:36:29 CEST 2010

On Mon, 5 Apr 2010 16:21:11 +1000
ronnie sahlberg <ronniesahlberg at gmail.com> wrote:

> So you would recommend that it would be one single target and then an
> ACL-like setting on a per initiator basis
> to control readwrite/readonly access to the lun.
> a,
> The simple way would then be to create some setting/mechanism where
> one could control this from one single target but on a
> per initiator basis. Kind of like the ACLs, but while ACLs work on a
> target, this setting would work on a Target+Lun basis.

I prefer this. But to be honest, I'm not interested in this feature
much. It would be nice but it's not a must for me.

> b,
> Something that would be a lot more work, since it would require a lot
> of additional infrastructure would be a question of
> 1, "how to keep metadata in sync across multiple targets",
> or, since we support multiple concurrent instances of tgtd :
> 2, "how to keep metadata in sync across multiple separate
> processes/instances of tgtd."

I will never do this. This needs tons of complicated changes (locking,
etc). It doesn't worth it. As I said before, tgt officially doesn't
support multiple instances. It's the advanced feature for users who
fully knows what they are doing.
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