> Our numbers vary greatly according to the clients.  We have very old
> Solaris machines that backup at 50+ MB/sec.  We have very new Windows
> machines where throughput varies greatly between different volumes on
> the same machine (e.g. a volume with 5 million tiny files backs up at
> 30 MB/sec via FlashBackup, while another volume on the same machine
> gets about 7 MB/sec backing up small files via FlashBackup).
> 
> It's difficult to get good numbers because we use multi-streaming and
> multiplexing like crazy.  So the actual throughput to the drive is the
> sum of the jobs using the drive at that moment.  Individual jobs vary
> between 5 MB/sec and about 65 MB/sec.  But the total throughput to the
> tape heads is unknown.
> 
> Anyone know an easy way to calculate that?

If your drives are fibre-attached, use something like MRTG to grab the fibre
port stats and graph that.  That gives us a pretty good idea as to what the
tape speeds are. 

--
Ed Wilts, Mounds View, MN, USA
mailto:ewilts AT ewilts DOT org
I GoodSearch for Bundles Of Love:
http://www.goodsearch.com/?charityid=821118 

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