NDMP attached drive does not come on line after NetVault restart
After a restart of NetVault services or a reboot of the NetVault system the NDMP attached drives show as offline. They do come on line if I check the drive manually.
In the binary log we see the following:
Error 2015/03/30 09:57:51 0 Media Netvault Command failed, re-initializing driver
Binary log subtext show the following:
SCSI :05224 16 0 95745 CMD STATUS 'CHECK CONDITION' [2]
SCSI :05224 17 0 95745 CMD SENSE KEY 'NOT READY ' [2] - ASC 3a ASCQ 00
SCSI :05224 18 0 95745 CMD SENSE INFO 'MEDIUM NOT PRESENT'
SCSI :05224 20 0 95745 CMD RETURN VALUE 2
SCSI :05224 14 0 95746 CMD TEST UNIT READY [ 00 00 00 00 00 00 ]
CAMNDMP :05224 157 0 95746 CMD 00 00 00 00 00 00
If drive diagnostics are enabled on the filer using the following command we see “tape device 3c.0 has more than one I/O pending, but the device supports only one I/O at a time” reported in the filer messages file.
mt -t <tape driver> diag 1
example
mt -t rst1a diag 1
messages file extract:
Wed Apr 8 12:00:49 CEST [s1800stp202:tapemc.iopending.exceeded:info]: tape device 3c.0 has more than one I/O pending, but the device supports only one I/O at a time.
If NDMP debug is also enabled we see NDMP4_UNDEFINED_ERR reported in the NDMPD debug file.
Extract from debug file.
00000035.00088672 004cd52f Wed Apr 08 2015 12:00:49 +02:00 [kern_ndmpd:info:4205] [60080] DEBUG: error=20 (NDMP4_UNDEFINED_ERR)
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