"John R. Jackson" wrote:
>
> >... 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.
>
> 1199840 is a strange number (as in, not a power of 2). Could you live
> with a blocksize of 1199104 (1171 KBytes)? That would waste 736 bytes
> on each track (less than 1%). It might be interesting to try some dd
> tests with 32 KBytes and 1171 KBytes to see how it does.
1171 KBytes would be fine. The Ampex engineer recommended that if the
memory used is page aligned use 1168. That is the largest multiple of
8K memory pages (the page size on a SGI.)
> Is 1199840 usable data, or does it include stuff the drive adds?
The ECC is stored on a seperate track. All of the 1199840 bytes are
usable.
> In any case, I can give you a larger blocksize right now, with some
> caveats. Go to the FAQ and look for the couple of articles on how to
> build Amanda from the CVS sources. You want branch amanda-242-tapeio.
> Then just set blocksize in your tapetype as needed (see the amanda(8)
> man page).
I'll try it. Thank you for the help.
--
Robert Minsk Centropolis Effects, LLC.
[EMAIL PROTECTED] 10950 Washington Blvd., Studio B
Culver City, Ca. 90232-4025
