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Re: cciss vs IDE (was: lvm with raid)

On Fri, 2 Jul 2004 16:22, Michael Loftis <mloftis@modwest.com> wrote:
> > If you have a hot-spare disk in the machine then you can have it take the
> > place of a disk that dies while the machine is running and then replace
> > the  defective hardware during a scheduled maintenance time.
> Except that in my experience a dead IDE drive takes the whole system with
> it even with MD RAID, the system just locks up.  (yes even on say three
> 'independent' channels).

That hasn't been my experience, maybe I haven't had a drive die in th right 
way.  All the disk failures I have experienced have had read errors be the 
only symptom.

It's expected that a drive electronics failure will take out any other drives 
on the same cable.  If a drive starts drawing excessive current then it can 
cause the entire system to hang (lack of power for the CPU and other 
devices), but I wouldn't imagine that to be common.

Maybe you encountered a bug in the device driver or the hardware?  In either 
case it would be interesting to repeat the test and file bug reports if it 
appears to be kernel code.

> YMMV of course...I've kind of thought about doing another experiment here
> lately I've got a handful of older drives at home that I've thought about
> trying failure scenarios (c'mon, don't tell me you're not the least bit
> interested in taking a ball peen hammer to a drive in a running system!!!)

Good idea!  Go for it!

Please make sure you have a camera that is capable of at least 2Mp on hand to 
put pictures of this on your web site!

http://www.coker.com.au/selinux/   My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/  Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/    Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/  My home page

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