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LUN crash?

Posted on 2011-02-15
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can LUN crash just like a server can? what is the DR best practice for LUNs?
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Question by:anushahanna
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robocat earned 250 total points
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A LUN can become corrupted due to hard- or software errors, and the data on it unusable.

The SAN storage system can crash which leaves the LUN unaccessible. If the disk storage gets damaged, the LUN may be lost.

Best practice: SAN mirroring for protection against outages of the storage system. Regular SAN backups or snapshots for protection against logical errors.

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by:anushahanna
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i guess the hard errors can't be recovered - can the soft ones?
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by:robocat
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It's very difficult to recover even from soft errors. As a LUN is a logical hard disk, one could try to use a hard disk recovery tool on the host that is using the LUN.

Best is to use snapshotting to be able to roll back to a state from before the errors, if the SAN supports snapshots.
 
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by:andyalder
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The controllers in the SAN can crash, nobody offers 100% uptime, 99.999% is a pretty common figure you'll see.
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by:anushahanna
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OK- 99.999% means that technology is so stable, only 1 in 1000 LUN implementations could be expected to fail, for whatever reason?

>>The controllers in the SAN can crash
that is the hard crash, right? what causes soft crash?
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by:andyalder
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99.999% reliability means it'll work for 99.999% of the time, commonly known as five nines - http://en.wikipedia.org/wiki/Five_nines

Soft crashes are down to your server corrupting the filesystem on the LUN normally, the most common one we see at EE is someone having two servers accessing the same LUN when they don't have any clustering software installed.
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by:anushahanna
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thanks for the guidance...
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