This box is a Dell Poweredge 2600 running Debian/Sarge with kernel 2.6.8. The
problem is with the tape:
# tar cf /dev/st0 /lib/modules/2.6.8-1-686-smp/
# tar xfv /dev/st0
<produces nothing or "Cannot allocate memory">
After heavy googling I tried passing tar the block size explicitly with -b
(for both invocations). It is not until '-b 216' that tar finally manages to
read back the archive. I can find no documentation for the Quantum DLT7000
that mentions a minimum block size and since it is a critical server I'm a
bit worried about this magic number that _seems_ to make it work.
I tested it with the default stinit.def and the one below.
Gabor Melis
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: MegaRAID Model: LD0 RAID5 39760R Rev: 2.48
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 04 Id: 06 Lun: 00
Vendor: PE/PV Model: 1x6 SCSI BP Rev: 1.1
Type: Processor ANSI SCSI revision: 02
Host: scsi0 Channel: 05 Id: 06 Lun: 00
Vendor: QUANTUM Model: DLT7000 Rev: 2561
Type: Sequential-Access ANSI SCSI revision: 02
# mt -f /dev/st0 status
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 0 bytes. Density code 0x85 (DLT 35GB compressed).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
# cat /etc/stinit.def
{buffer-writes read-ahead async-writes}
manufacturer="QUANTUM" model = "DLT7000" {
scsi2logical=1
can-bsr
auto-lock=0
two-fms=0
drive-buffering=1
buffer-writes
read-ahead=1
async-writes=1
can-partitions=0
fast-mteom=1
#
# If your stinit supports the timeouts:
timeout=3600 # 1 hour
long-timeout=14400 # 4 hours
#
# Drive is backwards compatible, use older modes (e.g. from above) as
required.
mode1 blocksize=0 density=0x85 # 35GB + compression
mode2 blocksize=0 density=0x84 # 35GB, no compression
mode3 blocksize=0 density=0x83 # 20GB + compression (DLT4000 mode)
mode4 blocksize=0 density=0x82 # 20GB, no compression (DLT4000 mode)
}
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