* cmd_per_lun vs can_queue
@ 2004-07-12 15:23 Shobhit Mathur
0 siblings, 0 replies; only message in thread
From: Shobhit Mathur @ 2004-07-12 15:23 UTC (permalink / raw)
To: linux-scsi; +Cc: linux-kernel
Hello,
I have a basic query related to the Scsi_Host_Template
fields namely : cmd_per_lun and can_queue. I would
like
to know what is the relation between the per-lun queue
and the per-HBA queue ?
To elaborate my query, I would like to know how are
the
I/Os from the upper-layers managed between per-lun and
the host-queue depth. In most cases the host-queue
depth
is very large [128 or more], while the per-lun queue
is
a fraction [5 or 2]. I would like to know how is the
relation between the two queues and how does this
impact
io-rate ?
- Kindly let me know as I have a blurred picture of
the
role of the 2 queues.
- Thank you very much
- Shobhit Mathur
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