RAID -- disk replacement ?

Storage experts typically recommend homogenous RAID
arrays (same size, RPM, cache, manufacturer, etc),
but this is not always possible on OLDER servers.

I assume it is OK to replace one of the failing
drives in my Dell Poweredge 2650 PERC4 with a same
size, RPM, bigger cache, and different manufacturer ?
Who is Participating?
Paul MacDonaldDirector, Information SystemsCommented:
I wouldn't expect any problems with what you're talking about, the caveat being your array will only perform as well as its least-capable member.
Dirk MareSystems Engineer (Acting IT Manager)Commented:
I agree with all your points, but I have found and their are people/experts that do agree with me. Using different makes or different models disks for RAID arrays do have advantages.

Reason, if you have 12 or more discs of the same make/model/firmware. If for instance the manufacturer has a problem with firmware or chip that all your drives are at risk of failure having different models/makes reduces this risk.

Greg HejlPrincipal ConsultantCommented:
With the older arrays it is important that the drives match specs.  Dell was pretty particular about using Dell certified drives in those days.

I would get the info from the old drive and search on ebay for the exact specs.  you may also have luck with
Different manufacturer is OK if they're all Dell branded, it's a pain that Dell don't give them all the same spare part number like HP do.

Rather a pain that Dell's support site gives gobbledygook part numbers too, sometimes we phone Dell, give them the tag number and ask them for a list of alternate part numbers rather than relying on Google.
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