From: "Justin T. Gibbs" <gibbs@scsiguy.com>
To: Mike Brown <mbrown@emc.com>, bferjul@emc.com, jkrasner@emc.com
Cc: conway_heather@emc.com, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] Ghost devices being reported with AIC7XXX version 6.2.6
Date: Thu, 31 Oct 2002 11:03:19 -0700 [thread overview]
Message-ID: <798370000.1036087399@aslan.btc.adaptec.com> (raw)
In-Reply-To: <20021031170337.GO574@lapi0061>
> Justin can you change AHC_NUM_LUNS to 32 or suggest an alternative fix?
The aic7xxx driver is not at fault and so should not be changed.
The aic7xxx driver really does support all 64 luns. In my opinion,
there are three problems here:
1) The Symetrix should treat a non-zero LUNTAR bit as an invalid
selection. This would prevent these higher luns from showing up
as valid devices.
2) Linux should never use more than 5 bits of lun for a device that
reports itself as SCSI-2. If the lun is larger than what will
fit in 3 bits, byte 1 of the CDB should not be altered even if
the device is SCSI2.
3) Linux should be using the Report Luns command to determine how
many luns are on a device and at what locations. This might
even allow you to never probe more than 8 luns on a SCSI 2
device unless they support this command. Does the Symetrix support
it? Going beyond 8 luns on a SCSI2 device is really a hack
otherwise.
--
Justin
next prev parent reply other threads:[~2002-10-31 18:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-31 17:03 [PATCH] Ghost devices being reported with AIC7XXX version 6.2.6 Mike Brown
2002-10-31 18:03 ` Justin T. Gibbs [this message]
2002-10-31 18:28 ` Matthew Jacob
2002-10-31 19:21 ` Alan Cox
2002-10-31 19:30 ` Matthew Jacob
2002-10-31 20:03 ` Doug Ledford
2002-10-31 20:04 ` Matthew Jacob
2002-10-31 20:17 ` Doug Ledford
2002-10-31 20:27 ` Matthew Jacob
2002-10-31 20:40 ` Matthew Jacob
2002-10-31 20:43 ` Doug Ledford
2002-11-01 13:00 ` Alan Cox
2002-11-01 1:41 ` Patrick Mansfield
2002-10-31 20:07 ` Doug Ledford
2002-10-31 20:26 ` Matthew Jacob
2002-10-31 20:38 ` Doug Ledford
2002-10-31 20:39 ` Matthew Jacob
2002-10-31 20:40 ` Mike Brown
2002-10-31 20:41 ` Matthew Jacob
2002-10-31 21:00 ` Mike Brown
2002-10-31 21:14 ` James Bottomley
2002-10-31 20:38 ` Mike Brown
2002-10-31 21:25 ` Doug Ledford
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