We avoid using the same HBA for disk and tape, as the fibre channel driver 
parameters required are pretty mutually exclusive.   For dual-path disk 
very short timeout and failover is usually configured.  For tape long 
timeout, and extended attempts at recovery.  And yes, we don't use the 
blades as SAN media servers for this very reason, as you cannot fit that 
third HBA port.  With servers like the DL380 we have almost no problems. I 
suggest you read up the Qlogic driver manual and compare with what is set 
in the registry.   You may be able to achieve some compromise settings to 
reduce the number of times the tape drops off.  And as someone else said, 
if you upgrade to 5.1 there may  be some fixes for the problem of mappings 
changing.

William D L Brown




"Chewning.Bruce" <Bruce.Chewning AT suntrust DOT com> 
Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu
21-Mar-2005 18:24
 
To
veritas-bu AT mailman.eng.auburn DOT edu
cc

Subject
[Veritas-bu] Compaq Blade Servers






We have been using Compaq Blade servers as Media servers in a SSO 
environment and believe the integrated HBA's (w/ qlogic chip set) may be 
the source of our grief (loosing tape drives, then finding them again with 
a different index/path). The Blade servers are running Win2000 and the 
NetBackup ver is 4.5. Each HBA has it's own zone in the SAN and can not 
see other HBA's and only the tape drives in it's zone. "Persistent 
Binding" is set on all the HBA's using a custom SANserfer utility we were 
provided by HP that allows us to use persistent binding, but we still have 
this problem. 
We went to Veritas and HP to ask If they had anyone who is using the 
Compaq Blade servers as Media servers with SAN attached tape drives. They 
could not find any customers using this configuration. 
My question is... Is anyone out there using Compaq Blade servers as 
NetBackup Media servers or even tested this configuration?
G.Bruce Chewning
 
 
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