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Title
Tape library hangs on a 'Checking' status with a 'ASC 00 ASCQ 00' error. -
Description
Environment details:
NetVault Server: 9.2 RedHat Enterprise 5.
Backup Device: Quantum Superloader 3 tape library (FW: V91.0 005B.0H) with an LTO-5 drive (IBM HH 5 TS2350 FW: D8D5) and connected to the NetVault Server via SAS.
The SAS cable from tape library is attached to SAS connector on mother board and not via a separate HBA, as that HBA was already in use.
The tape library was added to the NetVault Server and the drive starts checking and could hear the tape movement on the tape library.
However the status of the drive in the NetVault Device Manager window does not change from a 'Checking' status and therefore couldn't use the drive at all.
Checked that the tape library was setup to Random mode as per the following KBA (sequential mode is not supported) and was configured correctly:
https://support.quest.com/netvault-backup/kb/81148
Rebooting the NetVault Server, the tape library and re-added the tape library in NetVault Device Management made no difference.
The folloiwng error were logged manu times with NetVault Backup:
Error 2014/07/24 03:26:34 0 Media arcrestoreprimary Command failed, re-initializing driver
With sub text:
CHGSCSI 22 0 22550 CMD PREVENT/ALLOW MEDIA REMOVAL [ 1e 00 00 00 01 00 ]
CAM 4 0 22606 Sense Key: '0', Ext Sense: '0', Qual: '0'
CHGSCSI 24 0 22606 CMD STATUS 'CHECK CONDITION' [2]
CHGSCSI 25 0 22606 CMD SENSE KEY 'NO SENSE' [0] - ASC 00 ASCQ 00
CHGMGR 11 0 22634 Process DEVICE_INTERFACE messge
CHGMGR 4 0 22634 Send Manager Msg (BEGIN)
CHGMGR 5 0 22634 Manager Msg 2555 status=0 request=395 text=''
CAM 174 0 22634 SG driver version 30534
CAM 155 0 22634 Initial reserve 32768
CHGSCSI 22 0 22624 CMD TEST UNIT READY [ 00 00 00 00 00 00 ]
CAM 221 0 22624 Unexpected status
CAM 224 0 22634 Using version 3 SG CAM
SCSI 14 0 22634 CMD INQUIRY [ 12 00 00 00 32 00 ]
CAM 221 0 22634 Unexpected status
SCSI 15 0 22634 CMD failed: errno 0
This is a generic message and can point to anything from the Motherboard, HBA, HBA Driver, SCSI cables, SCSI Terminators, tape library, drive(s), tape library firmware, drive(s) firmware (all drives should be on the same firmware version).
You may have to try a HBA SAS card and place in the HBA slot, to check if the SAS connector on the Motherboard is at fault. -
Resolution
In this instance, the Linux SG Driver was trying to load and then failed with an unexpected status.
The following KBA describes more detail about loading the needed SG Driver and you may have to raise a case with RedHat for further assistance:
https://support.quest.com/netvault-backup/kb/79943
The 'modprobe sg' command ran with root access like in the above KBA and no driver information was listed i.e. hadn't automatically loaded and therefore caused the issue.
Additionally there could still be a hardware issue and would advise to contact your hardware vendor for further investigation, as well as supplying the above logs.
The Quantum Superloader 3 Device Application Notes are attached to this KBA. -
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