Greetings,
I wrote a message titled 'Problem with LTO-3 drive' to the list a few
days ago but received no reply to it. Since then I've discovered some
new information.
I have a new Exabyte Magnum 1x7 autoloader with an IBM LTO-3 drive and
it appears I *have* to use fixed block sizes otherwise it breaks. :-(
Machine: Dell Poweredge 2650
OS: CentOS 3.6
Bacula: 1.36.3 installed from RHEL3 RPMs
Tape: Exabyte Magnum 1x7 LTO-3
Running btape with 'defblksize 0' and no Minimum/Maximum Block size in
the Device stanza results in a hung btape process that cannot be killed.
I have to reboot the box to recover. Output from btape:
$ btape /dev/nst0
btape: butil.c:258 Using device: "/dev/nst0" for writing.
btape: btape.c:335 open_dev /dev/nst0 OK
*rewind
btape: btape.c:435 Rewound /dev/nst0
*test
=== Write, rewind, and re-read test ===
I'm going to write 1000 records and an EOF
then write 1000 records and an EOF, then rewind,
and re-read the data to verify that it is correct.
This is an *essential* feature ...
btape: btape.c:786 Wrote 1000 blocks of 64412 bytes.
btape: btape.c:465 Wrote 1 EOF to /dev/nst0
btape: btape.c:802 Wrote 1000 blocks of 64412 bytes.
btape: btape.c:465 Wrote 1 EOF to /dev/nst0
btape: btape.c:811 Rewind OK.
1000 blocks re-read correctly.
--END of QUOTE--
It never says 'Got EOF on tape.'
If I set the defblksize to 64512 on the tape and put
Minimum Block Size = 64512
Maximum Block Size = 64512
in the Device stanza then btape completes it's tests properly.
Here is the Device stanza involved:
Device {
Name = MagnumLTO-3
Media Type = LTO-3
Archive Device = /dev/nst0
AutomaticMount = yes;
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
# run 'mt -f /dev/nst0 defblksize 64512' before uncommenting these
# and 'mt -f /dev/nst0 defblksize 0' before commenting them out.
#Minimum Block Size = 64512
#Maximum Block Size = 64512
LabelMedia = yes;
Changer Command = "/etc/bacula/mtx-changer %c %o %S %a %d"
Changer Device = /dev/sg1
AutoChanger = yes;
Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
}
I also have a Dell PowerVault 132T with an LTO-2 drive on the same
controller that completes the btape test just fine. My Overland Data
Xpress was also working just fine with an LTO-1 drive until the drive
died recently.
Do I need to run my LTO-3 drive in fixed block mode or is something
wonky going on?
--[Lance]
--
Lance A. Brown
Senior Systems Programmer
ISDS, Duke University
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