Messages in this thread | | | Date | Wed, 26 Aug 2009 09:11:03 -0500 | From | Chris Adams <> | Subject | Re: [patch] document flash/RAID dangers |
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Once upon a time, Alan Cox <alan@lxorguk.ukuu.org.uk> said: > > The issues being raised here are not specific to extX, MD RAID, or Linux > > at all; they are problems with non-"enterprise-class" RAID setups. > > There's a reason enterprise-class RAID costs a lot more money than the > > card you can pick up at Fry's. > > And you will still need backups ;)
Yep. RAID (of any class) != fail safe.
> A long time ago I worked on a fault tolerant news server with dual > alphaserver boxes and a shared disk array. A power system failure took > out both the alpha boxes and the disk controllers and all the disks.
Hey, that's not funny! I'm typing this on a dual AlphaServer cluster with a shared disk array (with dual battery backup even), and we had a power failure at the NOC yesterday (that then tripped a breaker, although it was between the generator and the UPS, so nothing went down).
No matter how redundant you make things, a "no single point of failure" setup still can fail, often in "interesting" ways that nobody anticipated.
-- Chris Adams <cmadams@hiwaay.net> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble.
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