Re: Performance problems (solved)

"Ruud Baart" <[email protected]> wrote:

> The option fs=144m  is important for the speed of the backup. With the Sony AIT SDX-
> 700C I managed to get a speed of +/- 20.000 kBbytes/sec.  The servers has 1 Gb of 
> memory. The streamer has a buffer of 18 Mb.  I found hardly any speed difference 
> between fs=90M and fs=256M. Only the fifo statistics were different. 
>
> Some statistics:
>     /opt/schily/bin/star: fifo had 1836497 puts 76736 gets.
>     /opt/schily/bin/star: fifo was 115 times empty and 572 times full.
>     /opt/schily/bin/star: fifo held 150994944 bytes max, size was 150994944 
>     bytes
>     /opt/schily/bin/star: 76736 blocks + 0 bytes (total of 80463527936 bytes = 
>     78577664.00k).
>     /opt/schily/bin/star: Total time 8432.992sec (9317 kBytes/sec)
>
> We maintain 4 identical servers on 4 different locations. The overal backup speed is now 
> between 6.000 kBytes and11.000 kBytes/sec. I did not have time to find out why 
> 20.000 kBytes/sec is possible 
>
> Furthermore I found that xfsdump is the fastest dump utility. Faster then star. But very 
> specific: only XFS filesystems.

How much faster was it for you?

xfsdump is a hacked ufsdump and my tests show that for an average ufs filesystem,
star is approx. 20% faster than ufsdump.

Jörg

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