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Date: Fri, 07 Mar 2008 07:35:34 -0700
From: Scott Long <scottl@samsco.org>
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Cc: freebsd-scsi@freebsd.org
Subject: Re: only 8 LUNs on MPT
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d_elbracht wrote:
> we are using LSIs 3801E HBA to connect Infortrends S16S-G1030+JBOD (e.g. 32
> disks, 16 x RAID0, 16 LUNs) to an AMD64 machine.
> 
> the Infortrend Box is momentarily configured with 9 LUNs.
> 
> When booting only 8 LUNs (da45 to da52) show up
> 
> da45 at mpt0 bus 0 target 10 lun 0
> da45: <IFT S16S-G1030 361F> Fixed Direct Access SCSI-4 device
> da45: 300.000MB/s transfers
> da45: Command Queueing Enabled
> da45: 1430288MB (2929229824 512 byte sectors: 255H 63S/T 182336C)
> da46 at mpt0 bus 0 target 10 lun 1
> .....
> da52 at mpt0 bus 0 target 10 lun 7
> da52: <IFT S16S-G1030 361F> Fixed Direct Access SCSI-4 device
> da52: 300.000MB/s transfers
> da52: Command Queueing Enabled
> da52: 1430288MB (2929229824 512 byte sectors: 255H 63S/T 182336C)
> 
> "camcontrol reportluns 2:10"
> shows: "9 LUNs found"
> 
> how to get more that 8 LUNs to map?
> 
> May be, some limitation somewhere in the code for MPT ?
> 
> any help would be appreciated.
> 

The following sysctl/tunable must be set:

kern.cam.cam_srch_hi=1

This can be set via either /boot/loader.conf, /etc/sysctl.conf, or 
directly by running the sysctl command.

Scott