Set your HBA's to "Persistent Binding".  This will prevent re-targeting of the 
luns.
 
Bobby Williams
Sr. Systems Engineer
4250-A Benton Drive
Chattanooga, Tennessee  37406
Pager: 423-819-3336
Phone: 423-624-2600  x122
 

________________________________

From: veritas-bu-admin AT mailman.eng.auburn DOT edu on behalf of Zermeno, 
Brandon (Contractor)
Sent: Tue 1/25/2005 3:59 PM
To: Sanders, Donna; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] netbackup media servers losing connections to drives 
through SNCs



I had the same thing on some Brocade switches. If I am not mistaken the field 
engineer had to set the switches to not use the auto-detect. It was 
re-targeting the luns which in turn would cause NBU to down the drive.

 

________________________________

From: veritas-bu-admin AT mailman.eng.auburn DOT edu [mailto:veritas-bu-admin 
AT mailman.eng.auburn DOT edu] On Behalf Of Sanders, Donna
Sent: Tuesday, January 25, 2005 3:18 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] netbackup media servers losing connections to drives 
through SNCs

 

Hi,

  I am using Netbackup 4.5 in a Windows2000 environment.  There is the 
following SSO configuration:

An ADIC Scalar1000 with 24 AIT-3 drives attached to 6 SNCs (storage network 
controllers - fibrechannel-to-scsi bridges).

The SNCs are attached to Brocade Silkworm 3800 switches.

The 3 Netbackup media servers are also attached to the Silkworm 3800 switches 
(using Qlogic HBAs).

 

The problem I am having is that during a backup, the media servers will lose 
connection to some of the drives (you actually get the plug-and-play message on 
the server that a device was disconnected).  Sometimes it is just one of the 
drives on an SNC, and sometimes it is the whole SNC.  We can cycle everything 
(including the SNCs) and everything will work ok for a day or two and then the 
same thing happens again.  It is not limited to a specific media server, drive 
or SNC.

 

Has anyone seen this problem before?  Any help is greatly appreciated.