SCSI sense: UNIT ATTENTION, a problem?

giannidoe

giannidoe

I've got an LSI Logic SAS3081e controller with 5 disks attached as JBOD and recently I've noticed these messages cropping up in the logs.

Code: 
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): READ(10). CDB: 28 0 4 ad 5b a2 0 0 80 0 
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): CAM status: SCSI Status Error
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): SCSI status: Check Condition
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): READ(10). CDB: 28 0 4 ad 5b a2 0 0 80 0 
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): CAM status: SCSI Status Error
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): SCSI status: Check Condition
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): READ(10). CDB: 28 0 2 f6 96 a2 0 0 80 0 
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): CAM status: SCSI Status Error
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): SCSI status: Check Condition
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)

The SMART status of the disks is all fine, what are the likely causes of these messages and do I need to be concerned?
 
I'd check the most obvious first, see if all the cables are still properly seated. Also make sure you don't have a power problem.
 
Cables all seem fine, they are SAS->4xSATA with clips.
No other components seem to be complaining, any suggestions for checking if it's a power issue?
 
giannidoe said:
I've got an LSI Logic SAS3081e controller with 5 disks attached as JBOD and recently I've noticed these messages cropping up in the logs.

Code: 
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): READ(10). CDB: 28 0 4 ad 5b a2 0 0 80 0 
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): CAM status: SCSI Status Error
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): SCSI status: Check Condition
Mar 16 03:04:54 leiter kernel: (da3:mpt0:0:3:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): READ(10). CDB: 28 0 4 ad 5b a2 0 0 80 0 
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): CAM status: SCSI Status Error
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): SCSI status: Check Condition
Mar 16 03:04:54 leiter kernel: (da5:mpt0:0:5:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): READ(10). CDB: 28 0 2 f6 96 a2 0 0 80 0 
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): CAM status: SCSI Status Error
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): SCSI status: Check Condition
Mar 16 03:04:58 leiter kernel: (da4:mpt0:0:4:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)

The SMART status of the disks is all fine, what are the likely causes of these messages and do I need to be concerned?
Click to expand...

from mpt(4),
The following controllers are supported by the mpt driver:

Code: 
     +o	 LSI Logic 53c1030, LSI Logic LSI2x320-X (Single and Dual Ultra320
	 SCSI)
     +o	 LSI Logic AS1064, LSI Logic AS1068 (SAS/SATA)
     +o	 LSI Logic FC909 (1Gb/s Fibre Channel)
     +o	 LSI Logic FC909A (Dual 1Gb/s Fibre Channel)
     +o	 LSI Logic FC919, LSI Logic 7102XP-LC (Single 2Gb/s Fibre Channel)
     +o	 LSI Logic FC929, LSI Logic FC929X, LSI Logic 7202XP-LC (Dual 2Gb/s
	 Fibre Channel)
     +o	 LSI Logic FC949X (Dual 4Gb/s Fibre Channel)
     +o	 LSI Logic FC949E, LSI Logic FC949ES (Dual 4Gb/s Fibre Channel
	 PCI-Express)

The Ultra 320 SCSI controller chips supported by the mpt driver can be
found onboard on many systems including:

Code: 
     +o	 Dell PowerEdge 1750 thru 2850
     +o	 IBM eServer xSeries 335
Click to expand...

Is your controller one of the listed supported cards? Is the RAID BIOS updated? A supported card also would help if the BIOS/Firmware is up to the latest too.

The ASC 29/0 is not a common one I've seen, and I support mass disk storage subsystems at work. I see tons of Sense Keys and ASC numbers and 29/0 is uncommon.

Therefore, I am gearing toward checking for compat hardware.
 
It is supported, the chipset is 1068E.

I've now updated the firmware to the latest so I'll see how I get on.
 
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