Re: xfsdump: drive_minrmt.c:1862: do_get_write_buf: Assertion `contextp->dc_nextp < contextp->dc_recendp' failed.

[Bernhard Erdmann <be@xxxxxxxxxxx>]

> The tape drive is a Tandberg TDC 3820:
>
> # mt status
> SCSI 1 tape drive:
> File number=0, block number=0.
> Tape block size 512 bytes. Density code 0x10 (QIC-150/250 (GCR 10000 bpi)).
> Soft error count since last status=0
> General status bits on (41010000):
>  BOT ONLINE IM_REP_EN


Reading further down the man page for xfsdump I discovered -q for QIC 
drives:

       -q   Destination tape drive is a QIC tape.  QIC tapes only
            use a 512 byte blocksize, for which xfsdump must make
            special allowances.

Using this option xfsdump works properly:

# xfsdump -J -F -q -f /dev/st0 /var/mrtg
xfsdump: using scsi tape (drive_scsitape) strategy
xfsdump: version 3.0 - Running single-threaded
xfsdump: WARNING: no session label specified
xfsdump: level 0 dump of apollo.berdmann.de:/var/mrtg
xfsdump: dump date: Sun Dec  8 13:20:36 2002
xfsdump: session id: 5e94e959-40c2-4f11-ae7f-056d6eae5780
xfsdump: session label: ""
xfsdump: ino map phase 1: skipping (no subtrees specified)
xfsdump: ino map phase 2: constructing initial dump list
xfsdump: ino map phase 3: skipping (no pruning necessary)
xfsdump: ino map phase 4: skipping (size estimated in phase 2)
xfsdump: ino map phase 5: skipping (only one dump stream)
xfsdump: ino map construction complete
xfsdump: estimated dump size: 4899584 bytes
xfsdump: preparing drive
xfsdump: bad media file header at BOT indicates foreign or corrupted tape
xfsdump: WARNING: media contains non-xfsdump data or a corrupt xfsdump 
media file header at beginning of media
xfsdump: WARNING: repositioning to overwrite
xfsdump: creating dump session media file 0 (media 0, file 1)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 8388608 bytes
xfsdump: dump size (non-dir files) : 5388560 bytes
xfsdump: dump complete: 129 seconds elapsed
xfsdump: Dump Status: INCOMPLETE