SCSI reserve should be effective
regardless of how NetBackup is configured. My understanding is that if an
initiator has issued a SCSI reserve command to a drive, no other initiator can
mess with the drive until a SCSI release is issued or the drive is reset.
We had this issue with drives rewinding way back in the 3.4 days, and enabling
SCSI reserve cured the problem.
As long as NetBackup on the media server
running the backup issues the SCSI reserve, no other server should be able to
cause a rewind.
Jack L. Forester, Jr.
UNIX Systems Administrator, Stf
Lockheed Martin Information Technology
(304) 625-3946
From: Rosenkoetter,
Gabriel [mailto:Gabriel.Rosenkoetter AT radian DOT biz]
Sent: Wednesday, September 24,
2008 12:13 PM
To: Forester, Jack L; BeDour,
Wayne
Cc:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] SSO
between HP-UX and Windows
SCSI reserve only applies on the host in question. NetBackup
has a fancy scheme constructed for SSO that checks other known media servers'
SCSI reserves, but the protocol itself doesn't allow for shared access.
That means that any host that's not configured properly as a
media server but does see the drives and any process on any host that is
configured properly but isn't NetBackup can screw with drives other hosts are
using.
--
gabriel rosenkoetter
Radian Group Inc, Unix/Linux/VMware Sysadmin / Backup & Recovery
gabriel.rosenkoetter AT radian DOT biz, 215 231 1556
From: Forester,
Jack L [mailto:jack.l.forester AT lmco DOT com]
Sent: Wednesday, September 24,
2008 12:11 PM
To: Rosenkoetter, Gabriel; BeDour,
Wayne
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] SSO
between HP-UX and Windows
If the drive is SCSI reserved by another
host, how can EMS probing a drive cause it to
rewind? Now maybe if EMS on the server
that’s using the device probes the device on the server as it’s
using it, that could cause problems.
Jack L. Forester, Jr.
UNIX Systems Administrator, Stf
Lockheed Martin Information Technology
(304) 625-3946
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu]
On Behalf Of Rosenkoetter, Gabriel
Sent: Wednesday, September 24,
2008 11:48 AM
To: BeDour, Wayne
Cc:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] SSO
between HP-UX and Windows
Unless I'm mistaken, you do still need to deactivate EMS monitoring of stape devices on HP-UX, because it'll
probe devices that are SCSI-reserved by other hosts through a rewind device,
causing the tape to rewind under an active backup.
(But maybe that's less broken under 11iv3? I'm not sure, I
haven't tried recently.)
--
gabriel rosenkoetter
Radian Group Inc, Unix/Linux/VMware Sysadmin / Backup & Recovery
gabriel.rosenkoetter AT radian DOT biz, 215 231 1556
From: Martin
Ruslan [mailto:mit.martin AT gmail DOT com]
Sent: Tuesday, September 23, 2008
10:49 PM
To: BeDour, Wayne
Cc:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] SSO
between HP-UX and Windows
No problem at all..
just using the wizard, it's the recommended way according to the manual guide.
Regards,
mTz
On Tue, Sep 16, 2008 at 1:46 AM, BeDour, Wayne <WBedour AT lear DOT com>
wrote:
Our
environment, HP-UX 11-31 with a SureStore 20/700 tape library, one master /
media server running NetBackup 6.5.2 backing up mainly HP servers with a few
Sun and Windows boxes thrown in. We would like to configure one Windows
SAN media server, use SSO to share two tape drives with our HP Master on the
20/700. We are not currently using SSO and my only exposure so far is the
manual. Anyone like to share suggestions or what to look out for in
setting this up?
Thanks
in advance….
Wayne
BeDour
Unix
System Administrator
PH:
313-593-9876
Internet:
wbedour AT lear DOT com
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