All,
We recently upgraded the machine running Bacula to Red Hat Enterprise
Linux 5 from RHEL 3 and now see a much slower transfer rate during
backups. The version of Bacula is unchanged, 1.38.8, except for
re-compilation against the updated libraries.
One backup, which ran at 8772.2 to 12671.3 KB/s for 6.028 to 8.535 GB
before the upgrade, is now running at 2046.2 to 2464.3 KB/s for 2.77 GB.
Below I've included some output from tapeinfo as the scsi tape driver is
the most likely source of the slowdown. I've tried 'mt -f /dev/nst0
stsetoptions buffer-writes async-writes' with no effect.
I'd really appreciate some ideas on increasing the backup speeds to the
levels we used to get.
Thanks.
> tapeinfo -f /dev/sg1
Product Type: Medium Changer
Vendor ID: 'EXABYTE '
Product ID: 'LTO 1x7 2U '
Revision: 'B008'
Attached Changer: No
SerialNumber: '000087031125'
SCSI ID: 0
SCSI LUN: 0
Ready: yes
> tapeinfo -f /dev/sg2
Product Type: Tape Drive
Vendor ID: 'IBM '
Product ID: 'ULTRIUM-TD3 '
Revision: '52E0'
Attached Changer: No
SerialNumber: '1210075930'
MinBlock:1
MaxBlock:16777215
SCSI ID: 1
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: 0x38
Density Code: 0x44
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
> mt -f /dev/nst0 status
SCSI 2 tape drive:
File number=0, block number=-1, partition=0.
Tape block size 0 bytes. Density code 0x44 (no translation).
Soft error count since last status=0
General status bits on (1010000):
ONLINE IM_REP_EN
--
Tod Hagan
Information Technologist
AIRMAP/Climate Change Research Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire
Durham, NH 03824
Phone: 603-862-3116
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