On Wed, Mar 15, 2006 at 09:31:17AM -0500, Joshua Baker-LePain wrote:
> On Wed, 15 Mar 2006 at 6:50am, stan wrote
> 
> >Here is the tapetype I got for my HP SorageWorks 960
> >Ultrium 3 unit.
> >
> >Hopefully it will help others.
> >
> >define tapetype unknown-tapetype {
> >   comment "just produced by tapetype prog (hardware compression off)"
> >   length 386048 mbytes
> >   filemark 0 kbytes
> >   speed 49993 kps
> >}
> 
> FYI, I found that I got faster speeds with LTO3 by using larger than the 
> default blocksize of 32KB.  My nightly amanda backups get ~70MB/s using 
> 2MB blocks.

I went back and tries this, and at least with my current hardware, it's
quite a bit slower:


root@amanda:/usr/local/src/pd/amanda/amanda-2.5.0b2/tape-src# ./amtapetype -o 
-e 400G -b 2M -f /dev/st0
Writing 256 Mbyte   compresseable data:  39 sec
Writing 256 Mbyte uncompresseable data:  41 sec
Estimated time to write 2 * 409600 Mbyte: 131200 sec = 36 h 26 min
wrote 192512 2048Kb blocks in 94 files in 56755 seconds (short write)
wrote 193536 2048Kb blocks in 189 files in 56957 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression off)"
    length 386048 mbytes
    filemark 0 kbytes
    speed 6952 kps
}

Hopefully when my new PCI-X SCSI card shows up, this will get a lot better.


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