I
generally go one step further: exactly two devices per zone. What your SAN admin
is doing is insane: it works okay so long as the initiators' device drivers are
well behaved, but if they probe for devices chattily, they could interrupt
traffic for or even pick up another initiator as a target.
-- gabriel rosenkoetter Radian Group Inc, Senior Systems
Engineer gabriel.rosenkoetter AT radian DOT biz, 215 231 1556
I believe our SAN admin has one zone which
includes all the tape drives and all the HBAs for the media servers. Makes
it easy for him.
But we have performance problems. And
there is one other zone I think with just a couple of HBAs in it that performs
very well. I've been harping on zoning as a possible cause to our problems and
have run across this in Brocade's Zoning Best Practice guide (link provided
below).
Are there Netbackup environments out there
with one large zone containing many HBAs on it that isn't having performance
problems? I've been trying to lobby to get that fixed, or at least tested
further.
The meat of the pdf is:
The recommended grouping method for
Zoning is Single Initiator Zoning (SIZ), sometimes called “Single HBA Zoning.” With SIZ, each zone
has only a single HBA and one or more storage ports. If the HBA has both disk and tape storage devices, then
you need to create two zones:
one zone with the HBA and the disk devices and a second zone with the HBA and
the tape devices. SIZ is
optimal because it prevents any host-to-host interaction and limits RSCNs
to just the zones that need the
information within the RSCN.
and the link:
http://www.boche.net/blog/wp-content/uploads/2009/Zoning_Best_Practices_WP-00.pdf
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