I see between 95 and 105MB/sec to my LTO3 Drives.  That is staging savesets 
from AFTD devices which are on disk presented to the Backup Server via FC SAN 
to a SCSI attached LTO3 Library.  OS is Windows, Networker is v7.2.2.  I am 
quite happy with those speeds.

--Shawn

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On 
Behalf Of Ian G Batten
Sent: Tuesday, February 19, 2008 6:07 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] What does good LTO3 performance look like?

I'm backing up four streams of small files from a four-way Fujitsu PW450 
(equivalent to roughly a Sun V440) with a pair of DotHill SanNet II arrays 
running ZFS.

The storage node is a Sun V240 with an ADIC 100 LTO3 library attached, the 
networker node is another V240 with the indexes held on internal disks using 
ZFS.

The storage node and the networker node are at one end of 30 miles of GigE, the 
storage at the other.  The GigE is essentially dedicated.

Everything's Solaris 10.latest, everything's Networker 7.3.3. The obvious FSS 
niceties have been configured and the backup processes are all in their own 
projects with plenty of shares.  The machines are all otherwise idle.

I'm seeing about 200GB/hour (ie 55MB/sec, or ~50% of the network bandwidth).

I'm not at all unhappy, and this is fine performance for me.

I'm just curious to know what the limiting factor is and if there's anything 
obvious I could do to raise the performance a bit.  This is more about learning 
than about needs.

nsrmmd on the storage node is the obvious candidate, as it's consuming ~40% of 
a processor and making ~5K system calls per
second.   Is it possible to raise the overall blocking factor to make
more efficient use of the CPU?

ian

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