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re[2]: XFS and net devices, any pros or cons ?

To: Blizbor (IMA) <tb670725@xxxxxx>, <linux-xfs@xxxxxxxxxxx>
Subject: re[2]: XFS and net devices, any pros or cons ?
From: Greg Freemyer <freemyer@xxxxxxxxxxxxxxxxx>
Date: Fri, 16 Aug 2002 11:04:52 -0400
Organization: The NorcrossGroup
Sender: owner-linux-xfs@xxxxxxxxxxx
 >>  This what I'm building isn't shared SCSI.
 >>  I'm believe that shared SCSI couldn't survive some kind of crashes.


I just want to clarify that a shared scsi solution can be made no-SPOF and thus 
is at least as reliable as a drbd based solution.

The real issue is cost, not reliability.  

To do a no SPOF shared scsi solution, you have to build 2 separate shared scsi 
buses each with a set of data drives, then mirror the data between the 2 
different buses.  Another key component is to use external bus terminators, 
never internal.

I have never setup this kind of solution under Linux, but it is one of the very 
few no SPOF solutions officially supported in Compaq UNIX TruClusters.

Greg Freemyer
Internet Engineer
Deployment and Integration Specialist
Compaq ASE - Tru64 v4, v5
Compaq Master ASE - SAN Architect
The Norcross Group

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