If you are streaming to FC attached tape drives, you can monitor the FC
ports to see throughput speeds on the switch as it streams from the
media servers to the tape drives...

------------------------
- Harry


-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Joe
Royer
Sent: Monday, September 18, 2006 12:59 PM
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] LTO3 minimums

Forgive me if this has been asked before, I'm a bit behind on reading 
the list.

How do you keep your LTO3 drives spinning fast enough?

I have a meeting with an idiot manager who refuses to believe that we
can't stream fast enough to use LTO3 without damaging the tape and/or
drive.  I have limited DSSU space.  I have been in environments in the 
past where shoeshining was normal and so was the 20% failure rate and I 
don't want to go back.  It is my understanding that most people aren't 
spinning LTO3 fast enough and are living with higher failure rates.

The only thing I can think of is to send everything to DSSU first (TSM 
anyone?), but NBU sucks at telling you the throughput there so I'm not 
sure I trust that anyway.  Any tricks for getting throughput numbers out

of NetBackup (5.1) DSSU duplicates are very welcome.

My backup master with a 6-drive internal RAID-10 can barely hit 27MB/s 
reliably doing OS backups, but my DSSU is on SATA SAN drives and hard 
to measure.

Thanks!

-- 
Joe Royer / SysAdmin / Digital Motorworks / 512-692-1028


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