Honored Contributor Honored Contributor
Re: What are the maximum values for SCSI queue depth ?

HP-UX default Q-depth value is 8 for a LUN.
You can change it for an individual device using
scsictl scsictl -m queue_depth=xx /dev/rdsk/cxtxdx

The max Q-depth per array port for the following arrays are:

XPxxxx 1024
VA7xxx 750
EVAxxxx 2048

I do not know the values for internal disks but assume them very low!

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