How many ports do you use for each machine?

We recently built up this Netbackup infrastructure with a view to SAN
attaching it in the future.
Currently we only have a pair of V880s (each with dual HBAs) and a pair
of STK L700 with 4 FC LTO2 drives in each.

One V880 and one L700 live at each site. Each site has an 8 port FC
switch. (2 ports to the 2 HBAs on server, robot and 4 drives.) and the
8th port connects to our Optera Metro 5200 which provides FC
connectivity to our DR site, where the mirror image lives (2nd FC
switch, 2nd V880 and 2nd L700)...the 2nd V880 is idle.....only receiving
the NBU catalog using Veritas Volume Replicator.

With our SAN install on deck, the switches will be replaced with Brocade
24k's on both sides, and everything will connect to these.
The plan is for every SAN connected device in our network to use dual
HBAs managed with HDLM (Hitachi dynamic link manager).

Our backup server already has dual HBAs for the tapes......

Are you using a single HBA for disk, and a single HBA for tapes? If so,
does that mean your servers are connected to only one FC switch?
So you have multiple single points of failure? Or are you using dual
ported HBAs connected to two switches? Therefore only the HBA is a
SPOF??

I definitely would not want dual non connected fabrics. I've been
pushing this point here, as we're installing a 2nd 2gig FC pipe on our
Opteras for SAN replication traffic.....Some people are pushing to have
the backup traffic and replication traffic segregated....zones
comepletely separately, no talk between them......I've been saying that
this keeps us from being able to do "off host" backups.

How are most people doing backups of SAN attached volumes for servers
that are mouning disk directly from the SAN? Do you snapshot the volume,
then mount the snapshot on the media server, and back it up directly to
tape? Or do you install media servers on all the data servers with large
amounts of data, and use SSO?

Paul


> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of 
> Mark.Donaldson AT cexp DOT com
> Sent: June 7, 2005 6:45 PM
> To: shazari AT gmail DOT com; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Tape SAN + Data SAN
> 
> 
> I mix the tapes & disks on existing SAN.  I don't, however, 
> mix tapes &
> disks on the HBA side on the servers.  It's often recommended 
> against by
> vendors because HBA settings that are good for disks are bad 
> for tapes and
> vice versa.  I run different zones for tape & disk.
> 
> -M