mirroring the boot slice (slice 8) on x86

Hi there

I am about to mirror a Solaris 10 x86 box (SunFire X4100) onto a secondary disk using svm (current system is one disk). My question is this, on X86 boxes there is a slice 8 defined as boot partition (and also a slice 9, dunno what its used for tho). Do I need to mirror this boot slice as well ?..or does the boot partition need to be on the first disk only, or indeed by mirroring onto a metadisk i suppose I am keeping it on the first disk as the metadevice is the only disk .......aaaargh im confused

any help would be greatly aprreciated

cheers
Gary