I've been working (limping) along for several months using the
following hardware/software bacula autochanger tape setup:
Software:
# uname -a
FreeBSD bkup.utoronto.ca 7.0-RELEASE-p4 FreeBSD 7.0-RELEASE-p4 #2: Thu
Sep 4 08:58:43 EDT 2008
root AT bkup.utoronto DOT ca:/opt/obj/opt/src/sys/GENERIC i386
# pkg_info | grep bacula
bacula-bat-2.4.3 The network backup solution (GUI)
bacula-client-2.4.3 The network backup solution (client)
bacula-docs-2.4.3 The Bacula document set
bacula-server-2.4.3 The network backup solution (server)
Hardware:
# dmesg | grep -i scsi
ahc0: <Adaptec 2940 Ultra SCSI adapter> port 0xb400-0xb4ff mem
0xfeafe000-0xfeafefff irq 16 at device 4.0 on pci3
aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs
da0: <3ware Logical Disk 00 1.00> Fixed Direct Access SCSI-0 device
sa0: <HP Ultrium 1-SCSI E32K> Removable Sequential Access SCSI-3 device
ch0: <DELL PV-122T D37r> Removable Changer SCSI-2 device
I've gotten less than stellar performance from the tape/autochanger set up:
# echo "list media Pool=Default" | bconsole
Connecting to Director backup.cns.utoronto.ca:9101
1000 OK: backup-dir Version: 2.4.3 (10 October 2008)
Enter a period to cancel a command.
list media Pool=Default
Automatically selected Catalog: MySQL
Using Catalog "MySQL"
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+--------------+---------------------+
| MediaId | VolumeName | VolStatus | Enabled | VolBytes |
VolFiles | VolRetention | Recycle | Slot | InChanger | MediaType |
LastWritten |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+--------------+---------------------+
| 36 | Catalog | Error | 1 | 95,398,772,324 |
22 | 31,536,000 | 1 | 0 | 1 | Media-backup |
2008-06-30 11:48:22 |
| 559 | Vol-1 | Full | 1 | 160,904,991,744 |
683 | 31,536,000 | 1 | 1 | 1 | LTO-1 |
2008-08-27 05:31:50 |
| 568 | Vol-3 | Full | 1 | 11,174,833,152 |
54 | 34,560,000 | 1 | 3 | 1 | LTO-1 |
2008-08-30 07:32:28 |
| 570 | Vol-4 | Full | 1 | 23,107,295,232 |
106 | 34,560,000 | 1 | 4 | 1 | LTO-1 |
2008-09-05 05:55:30 |
| 572 | Vol-7 | Full | 1 | 69,669,347,328 |
297 | 34,560,000 | 1 | 7 | 1 | LTO-1 |
2008-09-21 03:24:23 |
| 573 | Vol-6 | Full | 1 | 3,281,596,416 |
19 | 34,560,000 | 1 | 6 | 1 | LTO-1 |
2008-09-22 14:00:12 |
| 574 | Vol-5 | Error | 1 | 25,882,149,888 |
127 | 34,560,000 | 1 | 5 | 1 | LTO-1 |
2008-09-29 04:00:32 |
| 578 | Vol-2 | Full | 1 | 2,737,889,280 |
19 | 34,560,000 | 1 | 0 | 0 | LTO-1 |
2008-10-28 03:53:34 |
| 579 | Vol-8 | Full | 1 | 140,503,200,768 |
429 | 34,560,000 | 1 | 8 | 1 | LTO-1 |
2008-10-27 02:29:38 |
| 595 | Catalog-01 | Append | 1 | 515,814,669 |
0 | 34,560,000 | 1 | 0 | 0 | Media-backup |
2008-10-30 04:56:26 |
+---------+------------+-----------+---------+-----------------+----------+--------------+---------+------+-----------+--------------+---------------------+
Notice that the VolBytes is all over the map. Some tapes seem to
indicate "full" even after 3 Gbytes of data.
So I wanted to dig a bit deeper and performed a standard "btape fill"
exercise, using Vol-2, which "failed" after 2.7G last time
it was in service.
After several hours of writing, about 80Gbytes worth I received the
low level kernel error message:
...
ch0 at ahc0 bus 0 target 3 lun 0
ch0: <DELL PV-122T D37r> Removable Changer SCSI-2 device
ch0: 3.300MB/s transfers
ch0: 8 slots, 1 drive, 1 picker, 0 portals
Trying to mount root from ufs:/dev/ad0s1a
....
(sa0:ahc0:0:5:0): Unexpected busfree in Data-out phase
SEQADDR == 0x7c
(sa0:ahc0:0:5:0): lost device
(sa0:ahc0:0:5:0): failed to write terminating filemark(s)
(sa0:ahc0:0:5:0): tape is now frozen- use an OFFLINE, REWIND or MTEOM
command to clear this state.
And after this fact the /dev/sa0 device was no longer usable and btape
was wedged.
Any ideas? Either the Dell hardware is very flaky and can not be used
in a production service,
or I've got some scsi hardware tuning to do.
Thanks in advance.
--
Russell Sutherland
russ AT quist DOT ca
+1.416.696.7600
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