From: Nichols, Scott BGI SDC (Scott.Nichols@barclaysglobal.com)
Date: Mon Aug 04 2003 - 15:45:29 EDT
If your storage array is setup to hand out fault tolerant LUN's then it
would be unnecessary to use Veritas for raid type LUN's. There are other
very good reasons to use a Volume manager:
1) Creating large LUN's on the Storage device and using VXVM to
slice it up to smaller LUN's for smaller filesystems needed. We use 2G
LUN's for sybase servers. If we have a 200G sybase server we would slice
200G from the Storage array then use VXVM to slice that down to 2G raw
devices for sybase. Creating 100 2G LUN's on the Array would effect
performance from the Array perspective. This would also help if you have
LUN count limits on your storage array.
2) VXVM gives you more portability. Assigning LUN names rather than
device names helps tremendously in the situation where you want to move
LUN's to a different host. Let's say you have a sybase server fail and you
want to take advantage of the SAN to move the sybase LUN's from Host A to
Host B. All you have to do is export from Host A then import to Host B.
SVM with soft partitioning will accomplish the same task, but you are stuck
dealing with "D" numbers rather than meaningful names. This isn't a big
deal in a small environment, but becomes quite a hassle when dealing with a
large environment.
Message: 5
Date: 04 Aug 2003 12:43:45 -0400
From: Vic Engle <sunmanager@summerseas.com>
Subject: SAN Storage best practice
To: sunmanagers@sunmanagers.org
Message-ID: <1060015425.20788.14.camel@mir.dcri.duke.edu>
Content-Type: text/plain
Good Afternoon,
We are in the beginning stages of deploying a SAN for our Solaris,
Windows and Linux environment. We currently use all direct attached
storage on our Suns and we use veritas vm to build fault tolerant
volumes from the direct attached storage.
When we implement the SAN we will be able to present luns to the Sun
boxes which are already fault tolerant in the SAN array. In this case is
it still advisable to use veritas vm for additional fault tolerance or
would that be overkill? Just wanted to get a feel for what most people
do.
Thanks,
Vic Engle
Unix Support
Duke Clinical Research
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