[9103] in linux-scsi channel archive
Re: Discussion to change SD_TIMEOUT in the sd driver
daemon@ATHENA.MIT.EDU (dhjohnso@us.ibm.com)
Fri Jun 30 12:23:16 2000
From: dhjohnso@us.ibm.com
To: linux-scsi@vger.rutgers.edu
Message-ID: <8725690E.005882AB.00@d53mta02h.boulder.ibm.com>
Date: Fri, 30 Jun 2000 10:06:45 -0600
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I think there needs to be a command or setable parameter that allows
setting the default timeout for a SCSI disk device to a value
in seconds. The system should supply a default of something like 30
seconds. Keep in mind that some SCSI disks will actually be virtualized
luns in a disk subsystem, like the IBM ESS (Shark). It can be useful in
this case to raise the default timeout value to
allow subsystem conditions that hold off I/O to not result in timeouts.
There also needs to be a setable parameter per device of the maximum tag
queue depth allowed because again luns inside
a disk subsystem may support and exploit very large queue depths. Much
larger than a JBOD can provide.
Dick Johnson, IBM
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