"John R. Jackson" wrote:
>
> >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.
>
> Ah, I see. None of the device I'm familiar with do that (that I know of).
>
I just got off the phone with the programmer who supports the drivers on
the SGI. Because of how they do there ECC checks each write to the variable
block size device writes a track. A track is exactly 1199840 bytes. If I
could increase the buffer size to 1199840 then I could achive about 15
megabytes a second. As it is now I am wasting space and time writing 32K
blocks.
As a side the way the non variable block size device works is it buffers
146 8K blocks (the biggest multiple of 8K < 1199840) and sends that to the
drive. Because of buffering and a wasted 3K of space the drive speed is
about 10 megs a second.
In the current version of amanda is there any way to pipe the output thru
"dd" to change the block size?
> John R. Jackson, Technical Software Specialist, [EMAIL PROTECTED]
--
Robert Minsk Centropolis Effects, LLC.
[EMAIL PROTECTED] 10950 Washington Blvd., Studio B
Culver City, Ca. 90232-4025
