Re: Poor raid 1 performance?

> Thanks. These were the sorts of descriptions that led me to hope that
> raid 1 would lead to improved read performance. Eg, one site says that
> "Read performance is faster than a single disk; (if the array controller
> is capable of performing simultaneous reads from both devices of a
> mirrored pair)."

Again, author probably meant a "random read access" performance, more
typical for multiuser systems (servers). It does not apply for a sequential
read performance, typical in situation when you load a huge executable or a
data file.

> This is why I was then suspecting that the motherboard implementations
> are poor. On the other hand, it might be just that the test was more
> reflective of sequential than random read performance.

Probably both in most cases.

> Can anyone suggest a raid 1 array that has improved performance?

Are you talking about "sequential read performance"? No, I don't know any
RAID1 product with that characteristic. But you can RAID0 instead (I know,
there is no redundancy), that definetely improves that type of performance
you are looking for. But improvement might not be too great. And you would
have to rely on backup for data protection (Unless you go RAID 10, but I
don't think it is an option you seriusly consider). Recent motherboards with
ICH7R look quite good. You can RAID5 and RAID10 on them.


.

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