[Gllug] Performance Tweaking of SCSI Tape Drive - Results

Huw Lynes huw-l at moving-picture.co.uk
Wed Jul 24 17:06:38 UTC 2002

Hi All,

Thanks to everyone who chipped in. After playing around with the DTF-2 
drive today we have managed to get 15MB/s consistently to the tape. 
This is a big improvement over 8MB/s.

The edited highlights are.

Check /proc/scsi/scsi to see that the drive had been noticed.
Check /proc/scsi/aix7xxx/0 to see what speed connection had been 
negotiated. In this case a 20MB/s link.
mt -f /dev/st0 status   tells us the tape drive is on-line.
tar cvfb /dev/st0 8192 *   tars everything from the current directory 
with a big block size to improve the speed.

If you want to use the drive's hardware compression to use less tapes
mt -f /dev/st0 compression

Thanks again,

| Huw Lynes               | The Moving Picture Company  |
| System Administrator    | 127 Wardour Street          |
|.........................| London, W1F 0NL             | 

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