We have an old Intel-server that doesnt have RAID-controller, so i use
software mirroring on userdata-disk.
I have two equal hd an status says "In sync and 100% mirroring".

I never dare to test by removing one disk to see if this work and i hope e
never is going to check this before a new hw-box is in place with RAID.

So how reliable is this software mirroring and how much does such
mirroring slow down disk perfomance?

Server is running NW6.5 SP5 and DATA: is on NSS.
I have all Post SP5-patches
Best regard,
Ronny Simonsen
Narvik - Norway

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