Louwtjie Burger <[EMAIL PROTECTED]> wrote:
> Ta on the comments....
>
> I'm going to use Jorg's 'star' to simulate some sequential backup workloads,
> using different blocksizes and see what the system do.
>
> I'll save some output and post for people that might match the same config,
> now or in the future.
>
> To be clear though: (currently)
>
> #tar cvfE /dev/rmt/0cbn /tmp/foobar
> (42 MB/s to tape sustained, 70% util on tape device)
>
> #tar cvfE /dev/rmt/0cbn /oracle/datafiles/*
> ( 24 MB/s to tape sustained, 24-60 MB/s zfs fs bursts)
>
> I'll post the star, iostat and other findings later.
If you have plenty of RAM and if you see that the tape
is not streaming with star, give star plenty of FIFO size.
If the tape drive supports 60 MB/s, give star 1800 MB for the
FIFo (fs=1800m) in case that your physical RAM is at least 4 GB.
This gives star 30 seconds reserve data for keeping the tape streaming.
Jörg
--
EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin
[EMAIL PROTECTED] (uni)
[EMAIL PROTECTED] (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily
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