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 Post subject: LTO1 tape and xfsdump
Unread postPosted: Thu Jul 05, 2012 6:45 am 
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Joined: Wed Mar 05, 2008 1:28 pm
Posts: 131
Location: Paderborn, Germany
Yesterday I set up my LTO-1 library for use with IRIX. It's an Exabyte 110L with
an IBM TD-1 drive in it. I modified the driver configuration in the way it's described
in this thread: http://forums.nekochan.net/viewtopic.php?f=3&t=16724885,
of course with the correct vendor and model strings matched...

After running autoconfig the device is correctly detected and usable (at least
it seemed to be usable with some little files and tar...)
For library robot control I use mtx.

Device is connected via FC fabric (QLA2200F in a shoehorn) to an Octane
running 6.5.22. The library itself connects to the FC fabric via a FC-LVDSCSI
bridge. The IO path is working fine with other devices connected to it.

Ok, then I tried to backup my file archive disc to tape via xfsdump. This is what I got:

Code:
# xfsdump -l 0 -f /dev/rmt/100000e00201cbbd/lun1vc/c4p200000 /usr/people/thoweh/files_2/

[...cut...]

xfsdump: creating dump session media file 167 (media 0, file 167)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 559939584 bytes
xfsdump: creating dump session media file 168 (media 0, file 168)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 557842432 bytes
xfsdump: creating dump session media file 169 (media 0, file 169)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 465567744 bytes
xfsdump: dumping session inventory
xfsdump: beginning inventory media file
xfsdump: media file 170 (media 0, file 170)
xfsdump: ending inventory media file
xfsdump: inventory media file size 4194304 bytes
xfsdump: writing stream terminator
xfsdump: beginning media stream terminator
xfsdump: media file 171 (media 0, file 171)
xfsdump: ending media stream terminator
xfsdump: media stream terminator size 2097152 bytes
xfsdump: I/O metrics: 3 by 2MB ring; 28883/45244 (64%) records streamed; 10292632B/s
xfsdump: dump size (non-dir files) : 92315075648 bytes
xfsdump: dump complete: 9128 seconds elapsed
xfsdump: Dump Summary:
xfsdump:   stream 0 (pid 1682) /dev/rmt/100000e00201cbbd/lun1vc/c4p200000 NONE (no error code)
xfsdump:   stream 0 (pid 1683) /dev/rmt/100000e00201cbbd/lun1vc/c4p200000 CORRUPTION (corrupt data encountered)
xfsdump: Dump Status: INCOMPLETE


What happend here? It says that the dump is incomplete, but the previous messages suggest that everything
went fine... additionally the amount of written data seems to fit the amount of data on the disk.

Maybe a bad tape (they already have some miles on them)? Or something else...?

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