Arno Lehmann wrote:
Hi,
On 9/27/2006 3:52 PM, Hristo Benev wrote:
...
I'm aware of all this, but in my case I think SW compression is better,
because I have 10MB network between servers (and that is enough for my
setup - except backup there is no high bandwidth demand application).
Also I've tested the HW compression (on similar drive in 1999) and the
backup was much slower??? and compression really bad!!!
That's something I can't comment on, but I'm quite sure that with all
tape drives I know compressed backups are faster as long as the
uncompressed data throughput of the SCSI bus is fast enough to avoid
shoeshining the tape drive.
Thats why I typed the command that should disable compression, but how I
can check???
mt -f /dev/tape compression off
tapeinfo gives me an error
tapeinfo -f /dev/tape
Try tapeinfo -f /dev/sgX
tapeinfo needs to be pointed to the generig SCSI device representing
your tape drive.
Arno
I have st0 as device, but it gives me the same result
Use sg? not st?. st is Sscsi Tape. nst is Non-Rewinding SCSI Tape, ans
sg is SCSI Generic.
Arno
mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=no
mtx: Request Sense: Error Code=0 (Unknown?!)
mtx: Request Sense: Sense Key=Hardware Error
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Additional Sense Code = C1
mtx: Request Sense: Additional Sense Qualifier = 85
mtx: Request Sense: BPV=yes
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
mtx: Request Sense: Field Pointer = 00 00
INQUIRY Command Failed
and mt status gives:
mt status
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 512 bytes. Density code 0x25 (DDS-3).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
Thank you,
By the way I use RedHat based OS (CentOS 4.4)
Thanks,
--
Hristo Benev
IT Manager
WAVEROAD
Partners in Telecommunications
514-935-2020 x225 T
514-935-1001 F
www.waveroad.ca <http://www.waveroad.ca>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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sg does not exist for me.
So I cannot use it, I have only /dev/st0 and /dev/tape is link to nst0
Thank you anyway.
--
Hristo Benev
IT Manager
WAVEROAD
Partners in Telecommunications
514-935-2020 x225 T
514-935-1001 F
www.waveroad.ca
[EMAIL PROTECTED]
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