EVA Continuous Access with TruCluster

From: Todd Acheson (acheson_at_ohio.edu)
Date: 05/18/05

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    Date: Wed, 18 May 2005 17:06:54 -0400
To: tru64-unix-managers@ornl.gov

    Hi,

    We had our EVA5K crash for unknown causes about 2 weeks ago and sustained
    24 hours of downtime. This raised the issue of how we could build more
    redundancy into our storage stack.

    There is Continuous Access (CA), and as I understand it there would not be
    seamless failover. You would mount the LUNs from the active EVA and if
    that unit failed, you would have to manually remap all filesets to the LUNs
    presented from the backup EVA.

    I was pointed to HP MetroClusters as a way to seamlessly have EVA failover,
    but in looking at the HP website, Metroclusters only appear to work with
    HP-UX. Can anyone validate this??

    If CA is indeed only a manual failover for TruClusters then perhaps I
    should just go back to LSM and use it to maintain consistency between 2
    EVAs. I used to use LSM prior to TruClusters but am a little concerned
    because we have on the order of 20 ADVFS domains with some that are very
    busy. Not sure if LSM would introduce any performance penalties.

    Todd Acheson
    Ohio University

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