SUMMARY: Volume Manager and T3

From: Callum Hughes (Callum.Hughes@sis.securicor.co.uk)
Date: Tue May 07 2002 - 05:49:43 EDT


Hi everyone!

First of all, many thanks to the following people for their informative and
useful responses:

Rob Forsey
Darren Moulding
Tony Walsh
Eric Shafto
Wayne McCormick
Darren Dunham
Deborah Crocker
Charlie Giannetto
Christopher Ciborowski
Joe Serra
Doug Otto
Mailing List (???)
Vipin Sharma

I'll briefly summarize the two main points people made:

1) Volume Manager is only presented with LUN's and as a result, is not able
to see an individual disk failure in a RAID 5 configuration. My concern
however stemmed from the results of tests we performed on a RAID 0
configuration whereby the entire LUN did fail (as you would expect) when a
single disk failed. However, with the RAID 5 configuration, the T3 brings in
the hot spare and begins rebuilding the LUN automatically and completely
transparently as far as VM is concerned. The only concern voiced was that
there may be an impact on performance.

2) The T3's can be configured as "partnered pairs" which enables you to use
the VM DMP feature. I don't know enough about T3's but this sounds very much
like multi-pathing on Clariion arrays. I might be completely wrong about
that one though so I'd recommend checking up on that if not sure!

Just to see this all for myself, I pulled a disk from one of the T3's in a
RAID 5 configuration and yes, VM chugged away merrily whilst the T3 brought
in the hot spare and started building on that. VM was indeed completely
oblivious to the "failure" and no problems encountered.

So I was quite a happy bunny really!

*Boing*

Callum A. Hughes
Unix Systems Engineer
e: callum.hughes@sis.securicor.co.uk

**********************************************************************
The information contained in this e-mail message is intended
only for the individuals named above. If you are not the
intended recipient, you should be aware that any
dissemination, distribution, forwarding or other duplication
of this communication is strictly prohibited. The views
expressed in this e-mail are those of the individual author
and not necessarily those of
Securicor Information Systems Limited.
Prior to taking any action based upon this e-mail message
you should seek appropriate confirmation of its authenticity.
If you have received this e-mail in error, please immediately
notify the sender by using the e-mail reply facility.
**********************************************************************

_____________________________________________________________________
This message has been checked for all known viruses on behalf of Securicor Information Systems by the MessageLabs. For further information visit http://www.messagelabs.com or Email: mailsweeper.info@sis.securicor.co.uk
_______________________________________________
sunmanagers mailing list
sunmanagers@sunmanagers.org
http://www.sunmanagers.org/mailman/listinfo/sunmanagers



This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 23:24:17 EDT