Veritas-bu

[Veritas-bu] Re: Does SSO Use SCSI Reserve/Release?

2001-05-31 14:50:06
Subject: [Veritas-bu] Re: Does SSO Use SCSI Reserve/Release?
From: anthony.guzzi AT storability DOT com (anthony.guzzi AT storability DOT com)
Date: Thu, 31 May 2001 14:50:06 -0400
Curtis,

  I'm sure you'll get a lot of responses on this, so consider my comments 
just part of the chorus.  If I understand SSO correctly, only the tape 
drives are shared, not the robot.  The robot is controlled by a single 
server which handles all tape mounts/unmounts.  In addition, this server 
also coordinates access to the tape drives.  It does this by running the 
'vmd' process (on a Unix system) in  'device allocation' (DA) mode.

-- Tony Guzzi
Solutions Engineer, AssuredRestore team
Storability, Inc.
118 Turnpike Road
Southborough, MA 01772

www.storabilility.com
The Leading Provider of Automated Storage Assurance for the Enterprise




veritas-bu-request AT mailman.eng.auburn DOT edu
Sent by: veritas-bu-admin AT mailman.eng.auburn DOT edu
05/31/2001 01:06 PM
Please respond to veritas-bu

 
        To:     veritas-bu AT mailman.eng.auburn DOT edu
        cc: 
        Subject:        Does SSO Use SCSI Reserve/Release?
Message: 5
Date: Thu, 31 May 2001 09:55:36 -0700
To: veritas-bu AT mailman.eng.auburn DOT edu
From: "W. Curtis Preston" <curtis AT backupcentral DOT com>
Subject: [Veritas-bu] Does SSO Use SCSI Reserve/Release?

I'm getting conflicting information from a couple of different sources, 
and 
I KNOW that someone out there knows the real answer.

How does SSO (for NetBackup & BE if possible) managed contention for the 
robot? It would seem that this could be done in one of two ways:

1. It uses the SCSI Reserve command when it starts to use the arm.

        <...... text deleted.    -AJG ......>

---
W. Curtis Preston
Principal Consultant for Storage Designs, your storage experts
Webmaster: http://www.backupcentral.com Phone: 760 631 7991



<Prev in Thread] Current Thread [Next in Thread>