RAID 1

[GeraldCC]

Hi guy's,
Is raid 1 safe to use in Ubuntu/Kubuntu?
I am reading the Ubuntu Server Administration (8.04 LTS)
Raid 1 appears to be recommended in this tome, but trying it in PCLinuxos 
2010.07 has given a lot of heart ache. If one removes the second drive in the 
array, then powers up again the system still runs BUT shutting down again and 
re-inserting drive 2 and trying to add it to the raid array I need to reformat 
the first drive to add the second and also format the second drive...So loosibg 
everything.
This does not seem to be the case in Ubuntu?
But is it OK and safe to use raid 1?
Gerald