[stgt] [PATCH 15/15] Remove dummy RAID controller from LUN 0
arne.redlich at googlemail.com
Tue Sep 8 23:30:36 CEST 2009
Thanks for merging the other patches.
Did you come to a conclusion on this one?
Am Dienstag, den 09.06.2009, 18:23 +0200 schrieb Arne Redlich:
> The dummy RAID controller serves 2 purposes:
> (1) commands that are addressed to an inexistent LUN are redirected to it
> (2) it provides a LUN 0 by default which is required by the SCSI spec
> (1) is obviously wrong because instead of "wrong lun" "invalid cdb" is returned
> to the initiator. A "shadow LUN" of type NO_LUN is now used for this purpose.
> This LU uses bs_null as backingstore, so there are no idle threads spawned for
> it (in contrast to the previous dummy raid controller at LUN 0).
> (2) confuses some OSes / users (Windows prompts for drivers,
> Solaris repeatedly tries to online the LU, but does not succeed).
> It's now the user's responsibility to attach a LU to LUN 0 to adhere to the
> SCSI spec (Solaris / WinXP don't insist, Linux does!).
> Signed-off-by: Arne Redlich <arne.redlich at googlemail.com>
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