Re: [Networker] Tape SANs and dedicated HBAs

Hi there,

On my experience, we had a customer that run the storage and the tapes on
the same HBA's (EMC Symm and ADIC) for 2 years and it gived me a lot of
problems, unsafe romoval of device, nw reporting tapes on drivers when there
weren't any, etc, even with NW 7.x. Once we installed new HBA's for the
tapes, the problems went away. 

____________________________
Bruno Madeira 
Consultant

TERASYSTEM 
Regus Torres de Lisboa
Rua Tomás da Fonseca, Torre G
1600-209 Lisboa - PORTUGAL
Phone: (+ 351) 21 723 07 28
Fax: (+351) 21 723 06 75 
b.madeira AT terasystem DOT pt
www.terasystem.pt 
 

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU] 
On
Behalf Of Paul Esson
Sent: terça-feira, 10 de Agosto de 2004 11:02
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Tape SANs and dedicated HBAs

Folks,
 
I would like to know from fellow subscribers how many folks are using
dedicated HBAs for tape versus shared HBAs for disk and tape in SAN
environments.  I am being told by a major library vendor that despite having
dual HBAs in hosts for redundant disk access, I need to install additional
HBAs to access their libraries.  They are suggesting two main
issues:
 

*       Conflicting requirements in HBA set-up for disk and tape
*       Potential conflict with multipathing/failover software

My proposal would not present multiple paths to a tape drive and my
understanding of the failover software we are proposing to use is that it is
disk specific and would not failover all I/O from one HBA to the other.
 
All comments appreciated.
 

Paul Esson
Senior Support Engineer
Redstor Limited

Direct:         +44 (0) 1224 595381
Mobile:         +44 (0) 7766 906514
E-Mail:         paul.esson AT redstor DOT com
Web:            www.redstor.com

REDSTOR LIMITED
Torridon House
73-75 Regent Quay
Aberdeen
UK
AB11 5AR

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