We generally use six as the maximum DLT's behind any HBA. The DLT's
will be behind SCSI to Fibre bridges I assume. The number of drives
behind a bridge is two per SCSI bus. If the bridge has two buses then
you could have four drives.
Dan P. Dale
System Specialist
Irvine,Ca
949-622-5186 x237
dan_dale AT stortek DOT com
StorageTek
INFORMATION made POWERFUL
-----Original Message-----
From: parker AT bctm DOT com [mailto:parker AT bctm DOT com]
Sent: Thursday, June 08, 2000 10:38 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] DLT7000 on FC/AL
Hi, folks,
I'm about to dip my toe into the world of Veritas Netbackup (actually,
for the amount I'm spending, I'll be dipping my whole body, I think!)
I'm stuck on one point - we've got a number of systems on a SAN and want
to implement NetBack SAN-ready. To that end, we'll be pursuing the
Shared Storage option drive sharing for all of our tape drives (15 DLT
7000s in 3 jukeboxes), and we'll have in total 6 media servers including
the master, a slave and 4 other big systems (with databases & big file
systems, etc). Maybe overkill...
Anyway, the question I've got is regarding the hardware - the master is
going to be either a Sun Enterprise 420R or Enterprise 450, and the
slave is going to be an Enterprise 220R. Both systems will have 2 CPUs
and a GB of memory.
What I don't know is how many tape drives I can reasonably expect to
drive from a single FC/AL PCI card in each server. Obviously, for a
large part of the time, the other media servers will be using the
drives, but I'll have about 90 other systems backing up and would like
to drive the drives @ full speed...
Is there a rule of thumb here? With differential SCSI, the rule was 2
drives per bus, but nobody seems to know with FC/AL...
Thanks!
Ross
--
Ross Parker | UNIX Sys Admin, Perl and C,
Systems/Network Admin | Networking and security
Telus Mobility |
| Lisp has all the visual appeal of oatmeal
parker AT bctm DOT com | with fingernail clippings mixed in (Larry
Wall)
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
