Date: Thu, 27 Jan 2000 12:14:02 +0100 From: "Oliver Blasnik" <ob@omnilink.net> To: "Kenneth D. Merry" <ken@kdm.org>, "LukeUnix" <lukeunix@infosite.com> Cc: <freebsd-scsi@FreeBSD.ORG> Subject: Re: CMD problems Message-ID: <01c601bf68b7$9da58ec0$da1940c2@omnilink.de> References: <200001251721.JAA32558@infosite.com> <20000125131901.A96487@panzer.kdm.org>
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Hi there,
Luke had some (well known) Problems:
> > I am having problems with a CMD CRD-5440 with multiple luns. The
config is 2
> > /kernel: (da2:ahc1:0:1:0): SCB 0x18 - timed out while idle, LASTPHASE
==
> > 0x1, SEQADDR == 0xa
> > /kernel: (da2:ahc1:0:1:0): Queuing a BDR SCB
> > /kernel: (da2:ahc1:0:1:0): Bus Device Reset Message Sent
> > /kernel: (da2:ahc1:0:1:0): no longer in timeout, status = 34b
> > /kernel: ahc1: Bus Device Reset on A:1. 2 SCBs aborted
> > /kernel: (da2:ahc1:0:1:0): SCB 0x28 - timed out while idle, LASTPHASE
==
> > 0x1, SEQADDR == 0x9
Go into CMD-Setup via serial, disable "Tagged Queuing" on the/all
Host-Channels.
Kenneth stated:
> The short answer is "don't do that".
> Other folks have discovered that the CMD RAID arrays don't quite work
right
> with more than one LUN enabled.
> Sorry I can't provide any solutions here, but this is almost certainly a
> problem with CMD's firmware, and the workaround is to only use one LUN
on
> the controller.
True, the problem is that crappy firmware, which does not currectly share
the commandqueue between multiple LUNs. If you _need_ multiple LUNs per
Hostchannel, disable tagged queuing.
This slows down disk-i/o a little bit, but the CMD works out very well due
to the fast cache-access.
Cu, Oliver
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