Re: many ide drives, raid0/raid5

["Dr. David Alan Gilbert" <gilbertd@treblig.org>]

* Florian Reitmeir (squat@riot.org) wrote:
> Hi,
> 
> i'm using on the machine kernel 2.6.0-test6-mm1 and 15 IDE
> Drives. Everything worked fine (uptime about 30 days) > I used, some
> raid5's, below some raid0's and on top evms.

> 
> heres "cat /proc/mdstat" so its more clear
> 
> ============ cut 
> Personalities : [raid0] [raid5]
> md4 : active raid5 hdp[2] hdo[1] hdn[0]
>       120627072 blocks level 5, 32k chunk, algorithm 2 [4/3] [UUU_]

This isn't too unusual; if as you say the drives are fine then I'd agree
it is probably a controller issue.  I've got a RAID that does this
regularly and you normally find in the log somewhere an IDE error of
some type (typically it dropping out of DMA due to a busy or it not
responding).

I've given up using multiple IDE PCI cards for this - they only just
work, and occasionally you'll get a glitch like this.  I've tried
a mixture of Promise and HPT cards.  In the end I gave up and got
a 3ware IDE RAID card which is working fine (you could just use it
as a large multichannel IDE card and run soft raid if you want I think).

Dave
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