I had an annoying issue between VxVM and the usage of CLARiiON snaps on
a Solaris host. The Solaris host was running VxVM 4.1 (MP something or
other). During the troubleshooting we coincidently upgraded our CX array
to FLARE 26 which introduced the ALUA functionality. After much
troubleshooting and getting nowhere with both EMC and VERITAS, I decided
to test the ALUA functionality, primarily because my read of the feature
suggested that it MIGHT affect my problem, for the better. Lo and behold
my issue with snaps completely disappeared when I enabled ALUA. I
discussed this extensively with VERITAS and EMC, but neither was willing
to admit that this "solved" my problem. The VERITAS tech told me that
regardless of whether it worked or not, they would not "officially"
support ALUA until some patch level of VxVM 5.0. I'm not sure if this
support has been officially released as we are still running 4.1/MPx.
That being said, I have two hosts configured with ALUA, running Solaris
10 and VxVM and I've not had any problems attributable to feature.



From: Romeo Theriault [mailto:romeotheria...@gmail.com] 
Sent: Monday, January 26, 2009 10:12 PM
To: veritas-vx@mailman.eng.auburn.edu
Subject: [Veritas-vx] ALUA support in vxdmp on Solaris Sparc?


Hello, I'm running VxVM 4.1 with vxdmp on a Solaris 9 sparc box. This
box is used to connect to a SAN. We will be making a change to the SAN
that suggests that the client DMP software uses ALUA (Asymmetric logical
unit access) if it is supported. After quite a bit of searching I'm
unable to verify if vxdmp in vxvm 4.1 (or any version for that matter)
supports ALUA. Does anyone know if it supports it and better yet where I
might be able to find some documentation on configuring/using it?

r...@melon> pkginfo -l VRTSvxvm
      NAME:  VERITAS Volume Manager, Binaries
  CATEGORY:  system
      ARCH:  sparc
   VERSION:  4.1,REV=02.17.2005.21.28
   BASEDIR:  /
    VENDOR:  VERITAS Software
      DESC:  Virtual Disk Subsystem
    PSTAMP:  VERITAS-4.1_p3.1:2005-10-24
  INSTDATE:  Jul 03 2006 14:25
   HOTLINE:  800-342-0652
     EMAIL:  supp...@veritas.com
    STATUS:  completely installed
     FILES:      827 installed pathnames
                  26 shared pathnames
                  18 linked files
                  98 directories
                 412 executables
              294475 blocks used (approx)

Many thanks,

Romeo Theriault
System Administrator
Information Technology Services

Veritas-vx maillist  -  Veritas-vx@mailman.eng.auburn.edu

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