From: Doug Ledford <dledford@redhat.com>
To: MShetty <mranalini.shetty@patni.com>
Cc: linux-scsi <linux-scsi@vger.kernel.org>,
linux-raid <linux-raid@vger.kernel.org>
Subject: Re: Lun 0
Date: Mon, 21 Oct 2002 12:18:57 -0400 [thread overview]
Message-ID: <20021021161857.GB28914@redhat.com> (raw)
In-Reply-To: <3DB421F8.438FF804@patni.com>
On Mon, Oct 21, 2002 at 09:19:12PM +0530, MShetty wrote:
> Hi,
>
> Thanks a lot for all the replies
>
> A piece of code I am reading, sends the Inquiry cmd to lun 0 first and then to
> the actual lun to be probed. As only SCSI devices have the concept of luns... I
> think the 1st probe to lun 0 is to check if it is a SCSI device but... on 2nd
> thought the same can be inferred by probing for lun n.
No. SCSI devices, if present on a given target, must have something on
LUN 0. That item on LUN 0 doesn't have to be online, but it has to exist
and respond to the INQUIRY command. LUNs > 0 need not exist.
> I have read something which says that some devices may mess up if probed for
> luns > 0. Is this true ??
Yes. Absolutely. Lots of CD-ROM drives will hard lock when you try and
probe for LUNs > 0.
--
Doug Ledford <dledford@redhat.com> 919-754-3700 x44233
Red Hat, Inc.
1801 Varsity Dr.
Raleigh, NC 27606
next prev parent reply other threads:[~2002-10-21 16:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <B9D57B41.43FC%mheinz@infiniconsys.com>
2002-10-21 15:49 ` Lun 0 MShetty
2002-10-21 16:18 ` Doug Ledford [this message]
2002-10-21 17:17 Bryan Henderson
-- strict thread matches above, loose matches on Subject: below --
2002-10-18 14:30 Martin Peschke3
2002-10-18 6:49 MShetty
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