From: Adam Flinton 

Geo. wrote:

>>I also have a software raid 1 server and it's a DOG -- very much slower
>
> than
>
>>the same machine not mirrored.  (it's scsi with decently fast drives, but
>>certainly not the latest and greatest.)  Lots of memory can help here
>>though....
>
>
> I've never had an issue with mirroring slowing a machine compared to a
> single drive setup except at boot when the drives are synced. My mail
> servers used to be mirrored until I moved to hardware RAID5 on both. I
> didn't move because I wanted RAID5 either btw, I just wanted the disk speed
> (faster than single disks) and I had the spare boxes sitting idle.
>
>

I have. If you mirror a swap file it can slow stuff right down.

Adam

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