The raid1 mirror has 2 disks; c1t0d0 and c1t1d0

Let me state a few facts just to ensure that you've got the principles here. Post back any questions on these points. It's important that you understand this.

1. Your box has an integrated RAID controller (but regard it as a separate card).

2. You interrogate/configure this controller using the raidctl command which can see all disks; mirrored or not.

3. If you create a mirror (using raidctl), one of the disks disappears as far as the O/S is concerned. The RAID controller simply presents one disk to the O/S and takes care of the mirror copy to the other disk. Therefore, the other (hidden) disk is NOT visible to the format command (unless you unmirror it).

Therefore what you posted tells me that there are 2 disks in the mirror. The OPTIMAL means that it is healthy.

There is a third disk in the system (c1t3d0) which is not mirrored and just simply passed through to the O/S.

Therefore the format command sees c1t0d0 (the RAID1 mirror; really 2 disks) and the third disk (c1t3d0).

Sorry if you already knew that but just to be sure that you know what you're looking at.

Run

Code:

# mount

to see if any slice of c1t3d0 is in use.

You can also select this disk in the format command and print it's vtoc to see if it's even sliced (partitioned). Maybe there's nothing on this disk.

Why do you think that you should contemplate breaking the mirror in order to patch? Just take a backup (perhaps to c1t3d0 if it's not in use).

There's plenty of knowledge and help available on this forum. Just post your questions.

Hope that helps.