"John R. Jackson" wrote:
>
> Is the 8K value a hardware blocking factor? Can you set the device to
> variable blocking?
>
On the SGI the non variable block size device is fixed at 8K. I can actually
change the tape drive block size to anything I want but the SGI limits you
to 8K.
With the variable block size device the drive makes no assumptions about the
data coming down the pipe and does not buffer. This means every write request
goes stright to the tape.
The DST has a maximum speed of about 15 megabytes per second. We have achived
close to 10 megabytes on the non variable (8K) device and only and 400
kilobytes on the variable block size device.
> I was considering adding code to deal with folks who write with variable
> and then the device gets set to a fixed size, and that might be at least
> part of the fix for you. The rest would probably be some minor tweaking
> in taper. If you really need to go that route, let me know.
I would need blocksizes at least down to 8K.
Would anything break if I set the TAPE_BLOCK_SIZE to 8 in common-src/amanda.h?
> John R. Jackson, Technical Software Specialist, [EMAIL PROTECTED]
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Robert Minsk Centropolis Effects, LLC.
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