Veritas-bu

Re: [Veritas-bu] single initiator zoning

2009-03-02 10:57:50
Subject: Re: [Veritas-bu] single initiator zoning
From: "Rosenkoetter, Gabriel" <Gabriel.Rosenkoetter AT radian DOT biz>
To: "'Geyer, Gregory'" <Gregory.Geyer AT avnet DOT com>, "veritas-bu AT mailman.eng.auburn DOT edu" <veritas-bu AT mailman.eng.auburn DOT edu>
Date: Mon, 2 Mar 2009 10:20:22 -0500
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

 


From: Geyer, Gregory [mailto:Gregory.Geyer AT Avnet DOT com]
Sent: Friday, February 27, 2009 10:35 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] single initiator zoning

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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