Hello Jochen

I think that NET_BUFFER_SZ plays at part in duplicate as it can be done 
between two media servers

Regards
Michael

On Fri, 26 Aug 2005 08:41:43 +0200, Jochen Pressler wrote
> Hi,
> 
> We have a strange performance issue with staging from Disk to Tape.
> 
> Config:
> Sun V440 as Master/Media Server
> Storagetek FlexLine640    used as Staging Device
> Storagetek L700 w. LTO3
> 
> SIZE_DATA_BUFFERS          2048k     
> NUMBER_DATA_BUFFERS        16
> SIZE_DATA_BUFFERS_DISK      2048k     
> NUMBER_DATA_BUFFERS_DISK    16
> 
> When we use the Flex640 as a "normal" Storage and doing Backups from 
> Disk to the L700 Storage,
> we see ~140MB/sec. throughput to one LTO3 (higher than expected).
> 
> When we use the same Volume on the Flex640 as an Disk Staging Unit 
> an do manual relocate to 1 LTO3 we only see ~70MB/sec.
> 
> When we are using two staging units on the flex and are staging to 2 
> LTO3 we see ~50MB/sec. per drive.
> An overall of 100MB/sec.
> 
> Since Staging is done via bpduplicate, are there any settings that 
> are staging, or bpduplicate specific? It looks like that there is an 
> "internal" limit, because tape, disk and system have spare resources 
> left (enough idle time)
> 
> do you have an ideas?
> 
> thx
> Jochen
> 
> -- 
> -----------------------------------------------------------------
> Jochen Pressler
> 
> Bacher Systems EDV GmbH
> Clemens-Holzmeister-Strasse 4 ,  A-1100 Wien, Business Park Vienna,
> phone: +43 (1) 60 126-34 | fax: +43 (1) 60 126-4
> jo AT bacher DOT at | http://www.bacher.at
> 
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