Re: [Networker] use of one fibre card for disk and tape access
2007-01-30 06:11:18
Hi Mark,
We're running Sun servers with Emulex LP9802 HBA'a in this kind of
setup, and it's (usually) stable & happy. We started out (in 2003) on
Q-logic 2340 cards, but the issue about HBA resets (as Lancy mentions)
came to bite us. The actual failures were due to the SAN fabric (Mcdata
3232 switches) sending out RSCN (Register State Change Notifications?)
to all connected HBA's when a change occured (host reboot etc). The
Q-logic answer to this (and default Emulex behavior) is to re-login to
the fabric, which breaks the tape IO stream, but is fine for disk IO.
The emulex cards have an option "USE ADISC", which alters the RSCN
behavior so that the HBA does a softer query of the fabric as to what
devices it's allowed to see - without breaking your tape IO stream :-)
My master server has two HBA's. They were set up one for disk, one for
tape, but the IO required for the tape traffic meant I've had to move
half of my tape IO on to the other HBA (shared with the disk access to
the /nsr partition). Been like that for a year of so with no problems.
I'm not too sure about sending buckets of backup-to-disk data down the
same HBA's, but that more throughput related than expecting errors.
HTH.
Will
mark wragge wrote:
What is the general opinion for use of one fibre card to access SAN attached
disk and then also using that fibre card for access to SAN attached tape
devices. I know that such configurations are supported but do they work
consistently and are they recommended?
Thanks.
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