IBM DS4800 Storage

David Rawling djr at
Thu Mar 4 12:43:21 UTC 2010

On 2/03/2010 2:40 AM, Dan Nelson wrote:
> In the last episode (Mar 01), Omer Faruk Sen said:
>> (da0:isp1:0:0:6): Vendor Specific ASC
>> (da0:isp1:0:0:6): Unretryable error
>> (da0:isp1:0:0:6): READ(10). CDB: 28 0 0 0 0 10 0 0 1 0
>> (da0:isp1:0:0:6): CAM Status: SCSI Status Error
>> (da0:isp1:0:0:6): SCSI Status: Check Condition
>> (da0:isp1:0:0:6): ILLEGAL REQUEST asc:94,1
>> (da0:isp1:0:0:6): Vendor Specific ASC
>> (da0:isp1:0:0:6): Unretryable error
> According to the "DS4000 Problem Determination Guide" at
> , ASC/ASCQ 94/01 corresponds to "Invalid Request Due to Current Logical Unit
> Ownership".  Maybe the DS4800 thinks that the lun has been assigned to a
> different host, and that's why it won't let the FreeBSD machine access it.
> Other web searches indicate that this may be an attempt to access the
> passive path of multipathed device on an active/passive RAID array.  If
> that's the case, FreeBSD should have found another disk (da1 possibly?) that
> you should be able to use.
That being the case, it's also possible that the LUN is accessible to 
the FreeBSD system, but another application or system has applied a 
SCSI-2 "reservation" or a SCSI-3 persistent reservation to the disk; 
that would prevent the FreeBSD system from accessing the LUN.

Perhaps see what servers or devices the DS4800 thinks is connected to 
the LUN.


David Rawling
PD Consulting And Security
Mob: +61 412 135 513
Email: djr at

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