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I can't get my server to recognize the tape changer... It was working a couple months ago when I last turned it off, but it doesn't work now... [root@luzeiro ~]# ...
  1. 03-13-2009 #1
    cyberblade3001
    cyberblade3001 is offline
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    Problem with SCSI tape library

    I can't get my server to recognize the tape changer...

    It was working a couple months ago when I last turned it off, but it doesn't work now...


    [root@luzeiro ~]# cat /proc/scsi/scsi
    Attached devices:
    Host: scsi0 Channel: 00 Id: 00 Lun: 00
    Vendor: IBM Model: SERVERAID Rev: 1.00
    Type: Direct-Access ANSI SCSI revision: 02
    Host: scsi0 Channel: 00 Id: 15 Lun: 00
    Vendor: IBM Model: SERVERAID Rev: 1.00
    Type: Processor ANSI SCSI revision: 02
    Host: scsi0 Channel: 01 Id: 04 Lun: 00
    Vendor: IBM Model: ULT3580-TD3 Rev: 73P5
    Type: Sequential-Access ANSI SCSI revision: 03
    Host: scsi0 Channel: 02 Id: 08 Lun: 00
    Vendor: IBM Model: 40K6480a S320 0 Rev: 1
    Type: Processor ANSI SCSI revision: 02
    Host: scsi1 Channel: 00 Id: 20 Lun: 00
    Vendor: IBM-ESXS Model: EXP3000 Rev: 0151
    Type: Enclosure ANSI SCSI revision: 04
    Host: scsi1 Channel: 02 Id: 00 Lun: 00
    Vendor: LSI Model: MegaRAID 8480E Rev: 1.03
    Type: Direct-Access ANSI SCSI revision: 05


    I have the exact same library with an identical server (different peripherals though, but the library is connected using the built in SCSI card on both) that is working correctly and it shows me this:

    [root@hood ~]# cat /proc/scsi/scsi
    Attached devices:
    Host: scsi0 Channel: 00 Id: 04 Lun: 00
    Vendor: IBM Model: ULT3580-TD3 Rev: 73P5
    Type: Sequential-Access ANSI SCSI revision: 03
    Host: scsi0 Channel: 00 Id: 04 Lun: 01
    Vendor: IBM Model: 3573-TL Rev: 6.70
    Type: Medium Changer ANSI SCSI revision: 05
    Host: scsi2 Channel: 00 Id: 00 Lun: 00
    Vendor: IBM Model: SERVERAID Rev: 1.00
    Type: Direct-Access ANSI SCSI revision: 02
    Host: scsi2 Channel: 00 Id: 01 Lun: 00
    Vendor: IBM Model: SERVERAID Rev: 1.00
    Type: Direct-Access ANSI SCSI revision: 02
    Host: scsi2 Channel: 00 Id: 15 Lun: 00
    Vendor: IBM Model: SERVERAID Rev: 1.00
    Type: Processor ANSI SCSI revision: 02
    Host: scsi2 Channel: 01 Id: 15 Lun: 00
    Vendor: IBM Model: EXP400 S320 Rev: D110
    Type: Processor ANSI SCSI revision: 03
    Host: scsi2 Channel: 02 Id: 08 Lun: 00
    Vendor: IBM Model: 40K6480a S320 0 Rev: 1
    Type: Processor ANSI SCSI revision: 02

    As you can see this second server shows both the drive and the tape library on scsi0 while the first server only shows the drive.

    I have restarted both the server and the Library several times. I've also tried with a different SCSI card and there was no change.

    I know the changer works, as I can access the changer through its web interface, and manually change tapes. And the SCSI connection works, because it's just one SCSI connector, and it can access the drive, just not the changer. Any ideas?

    Server is running RHEL 4, with a 2.6.9 kernel
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  2. 03-13-2009 #2
    HROAdmin26
    HROAdmin26 is offline
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    No, they're not set up the same...

    The 2ND machine has the library attached to its own SCSI card:

    Code:
    Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: IBM Model: ULT3580-TD3 Rev: 73P5
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 04 Lun: 01
Vendor: IBM Model: 3573-TL Rev: 6.70
Type: Medium Changer ANSI SCSI revision: 05

Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 01 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
    While the first machine shows the library attached to the IBM SERVERAID controller. In general, RAID cards and tape hardware don't get along.

    Code:
    Host: scsi0 Channel: 00 Id: 15 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Processor ANSI SCSI revision: 02

Host: scsi0 Channel: 01 Id: 04 Lun: 00
Vendor: IBM Model: ULT3580-TD3 Rev: 73P5
Type: Sequential-Access ANSI SCSI revision: 03
    The 2ND machine shows that the changer and tape drive use the same SCSI ID and are distinguished by a LUN ID. The non-working machine shows the device at SCSI ID 4 and LUN 0, but *doesn't* show the device at SCSI ID 4 LUN 1. Many SCSI cards require that LUN support is turned on/off in the BIOS of the SCSI card.

    If LUN support is not enabled, nothing above LUN 0 would be seen.

    And the SCSI connection works, because it's just one SCSI connector, and it can access the drive, just not the changer.
    This validates only that the *drive* is seen on the SCSI bus. It does not mean there is not an issue between the changer and the SCSI bus.
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  3. 03-14-2009 #3
    sahabcse
    sahabcse is offline
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    Smile

    Hi

    Upgrade the OS and try.
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