From: Luben Tuikov <luben@splentec.com>
To: Steve Brueggeman <xioborg@yahoo.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: Should sd REALLY allocate a device for an offline device
Date: Fri, 14 Mar 2003 14:33:59 -0500 [thread overview]
Message-ID: <3E722EA7.7040802@splentec.com> (raw)
In-Reply-To: bj147v0fn10c6duj1n06jo84uurn1i0dvj@4ax.com
Steve Brueggeman wrote:
> There's a managed storage device that reports 0x20 in byte 0 of the
> Inquiry data, which means it's a SCSI_DISK, but the LUN is detached.
The physical device is not currently attached to the LU, but the device
is supported and we know a fait bit about it from the INQUIRY data.
> scan_scsis_single() acknowledgs this, and marks the device as not
> online, and lets the upper level device drivers decide what to do.
This is the right thing to do.
> It is my belief that if a device is not online, the scsi disk driver
> should not allocate a device slot for it. See the following simple
> patch. Any thoughts? It seems obvious to me, but maybe I'm missing
> something.
As was already answered, a device being ``offline'' doesn't mean that's
it's not there. In the simplest terms it means that the LU device server
cannot process any commands addressed to the physical device at this moment.
--
Luben
next prev parent reply other threads:[~2003-03-14 19:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-14 16:50 Should sd REALLY allocate a device for an offline device Steve Brueggeman
2003-03-14 19:33 ` Luben Tuikov [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-03-14 18:17 David.Egolf
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