transport errors in iostat


 
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# 1  
Old 01-25-2012
transport errors in iostat

Hi Unix experts,

I have a question regarding a disk failure seen in "iostat -Enm" output:

Code:
# iostat -Enm
c1t0d0          Soft Errors: 0 Hard Errors: 7 Transport Errors: 9
Vendor: FUJITSU  Product: MAU3073NCSUN72G  Revision: 0802 Serial No: 0514F005M0
Size: 73.40GB <73400057856 bytes>
Media Error: 6 Device Not Ready: 0 No Device: 1 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c1t1d0          Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: FUJITSU  Product: MAU3073NCSUN72G  Revision: 0802 Serial No: 0514F005G4
Size: 73.40GB <73400057856 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c0t0d0          Soft Errors: 31 Hard Errors: 114 Transport Errors: 0
Vendor: TOSHIBA  Product: DVD-ROM SD-R6112 Revision: 1731 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 37 Device Not Ready: 65 No Device: 12 Recoverable: 0
Illegal Request: 30 Predictive Failure Analysis: 0

also see the following meessage related to transport issue:

Code:
# grep transport /var/adm/mess*
/var/adm/messages:Jan 12 13:31:35       SCSI transport failed: reason 'reset': retrying command

I wonder if disk c1t0d0 needs to be replaced due to these hard and transport errors...
# 2  
Old 01-25-2012
I suppose c1t1d0 and c1t0d0 are on the same controller? is it so?
Well you can be sure one of your disks is faulty and need attention...
# 3  
Old 01-25-2012
yeah exactly they are both on c1 scsi controller.. i wonder if this was a temporary problem on disk cause the alarm was from 12th Jan.. no alarm seen after then..have any idea?
# 4  
Old 01-25-2012
Are the disks in mirror?
These are non OS disks are they? (If mirror...)
# 5  
Old 01-25-2012
yes, both disks are mirrored, metareplace was invoked and problematic disk was resycned from its sub mirror..

Metastat does not return any message pointing disk need any maintenance process..but there is still some hard and transport errors on it, these errors are not incremented though..
# 6  
Old 01-25-2012
I asked you that because if you were to have some active swap on the disk your system would have crashed...
Well all you have to do now is be prepared to change the disk ( have a new spare aside...) and keep an eye, usually a bad disk will go nuts at a point (you will see hundreds of scsi resets Smilie ...) or the disk is already dead (stopped and cold Smilie ) and so no more resets..
 
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