Re: Software RAID5 with 2.6.0-test

[Måns Rullgård]

Andre Tomt <andre@xxxxxxxx> writes:

>> When I tried it, I was running 2.6.0-test4.  The RAID5 was 4 120 GB
>> Seagate disks on a Highpoint controller.
>
> <snip>
>
>> The other thing that I don't like, is the performance of the RAID
>> array.  The disks individually give ~40 MB/s read speed, but the array
>> only measures 25 MB/s.  I was of the impression, that RAID5 would give
>> read speeds at least equal to the underlying disks.  Is this
>> incorrect?
>
> Was this a 4 port or 2 port HPT controller? Keep in mind, two disks on
> the same IDE channel severely degrades performance, *especially* with
> RAID.

It's a four port SATA controller.  I'd never even think about placing
two disks on the same cable.

-- 
Måns Rullgård
mru@xxxxxxxxxxxx
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