Re: Seagate/Conner CTT8000S problem on FreeBSD

[Felix Deichmann]

Sorin Chiorean wrote:

Can anybody tell me how can I turn on hardware compression for this tape
unit or what can I do to be able to buck up more then 4Gb ??
See
http://groups.google.com/groups?q=%22conner+CTT8000-S%22+compression&hl=en&lr=&ie=UTF-8&oe=utf-8&selm=Pine.LNX.3.96.980609195953.1366E-10%40rwc1&rnum=4
(Sorry for the long link)

This drive doesn't seem to support hardware compression. You have to use 
a software solution, e.g. gzip or bzip2 (in connection with tar).

Regards

Felix

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Seagate/Conner CTT8000S problem on FreeBSD

[Sorin Chiorean]

Hi,

I'm running FreeBSD  5.1-RELEASE-p8 on a Pentium II with SCSI adapter  

..kernel: ahc0:  port 0xb800-0xb8ff mem
0xe280-0xe2800fff irq 10 at device 11.0 on pci0
..kernel: aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs

and with the following tape:
..kernel: sa0 at ahc0 bus 0 target 6 lun 0
..kernel: sa0:  Removable Sequential Access
SCSI-2 device
..kernel: sa0: 5.000MB/s transfers (5.000MHz, offset 15)

I tried to backup up on a 8Gb(compress)TRAVAN TR-4 tape, 4.4Gb of data
and didn't work.
I used tar and dump and I ended up with the same problem: I can not
backup up more then 4Gba on /dev/sa0 or /dev/nsa0.
It's seems that hardware compression doesn't work on FreeBSD. Was
working fine on a Windows 2000 server before.

I tried to change Compression with "#mt -f /dev/sa0 comp enable" but
didn't work (I tried with "comp on" too)
This is what I get after a "#mt status":
 
Mode  Density  Blocksize  bpi  Compression
Current:  0x45 variable   0disabled
-available modes-
0:0x45 variable   0none
1:0x45 variable   0none
2:0x45 variable   0none
3:0x45 variable   0none
-
Current Driver State: at rest.
-
File Number: 0  Record Number: 0Residual Count 28

Can anybody tell me how can I turn on hardware compression for this tape
unit or what can I do to be able to buck up more then 4Gb ??


Sorin Chiorean
Network Specialist
Computer Partners
 


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