Dec 312015
 

Yesterday and today, none of my Bacula copy-to-tape jobs completed because my tape drive was missing. Today, I reseated all the cables, and power cycled the tape library.

In my ssh session, I did this:

$ sudo camcontrol devlist
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 2 lun 0 (da0,pass0)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 10 lun 0 (da1,pass1)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 11 lun 0 (da2,pass2)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 12 lun 0 (da3,pass3)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 13 lun 0 (da4,pass4)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 14 lun 0 (da5,pass5)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 16 lun 0 (da6,pass6)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 17 lun 0 (da7,pass7)
<TOSHIBA DT01ACA300 MX6OABB0>      at scbus5 target 0 lun 0 (ada0,pass8)
<TOSHIBA DT01ACA300 MX6OABB0>      at scbus5 target 1 lun 0 (ada1,pass9)
<COMPAQ MSL5000 Series 0520>       at scbus7 target 3 lun 0 (ch0,pass11)

.

There is no tape; we should be able to see sa0.

I did a rescan:

$ sudo camcontrol rescan 7  
Re-scan of bus 7 was successful

In /var/log/messages, I saw:

Dec 31 14:49:54 knew kernel: sa0 at sym0 bus 0 scbus7 target 1 lun 0
Dec 31 14:49:54 knew kernel: sa0: <COMPAQ SuperDLT1 5F5F> Removable Sequential Access SCSI-2 device
Dec 31 14:49:54 knew kernel: sa0: Serial Number CXB37H0071  
Dec 31 14:49:54 knew kernel: sa0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit)

Rerunning the original command, I see:

$ sudo camcontrol devlist
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 2 lun 0 (da0,pass0)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 10 lun 0 (da1,pass1)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 11 lun 0 (da2,pass2)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 12 lun 0 (da3,pass3)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 13 lun 0 (da4,pass4)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 14 lun 0 (da5,pass5)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 16 lun 0 (da6,pass6)
<ATA TOSHIBA DT01ACA3 ABB0>        at scbus0 target 17 lun 0 (da7,pass7)
<TOSHIBA DT01ACA300 MX6OABB0>      at scbus5 target 0 lun 0 (ada0,pass8)
<TOSHIBA DT01ACA300 MX6OABB0>      at scbus5 target 1 lun 0 (ada1,pass9)
<COMPAQ SuperDLT1 5F5F>            at scbus7 target 1 lun 0 (pass10,sa0)
<COMPAQ MSL5000 Series 0520>       at scbus7 target 3 lun 0 (ch0,pass11)

There’s my tape drive, on the 2nd line from the bottom!

Shortly afterwards, Nagios noticed and told me so: ** RECOVERY alert – knew/check_sa0 is OK **

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