[SunHELP] Do you need to break the mirror when replacing a bad hard drive ?

[sunhelp at sunhelp.org]

The box has not been reboot since Feb this year.

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Hello Administrators,

We have RADI 1 (mirror) set up by DiskSuite on the boot disk.  There is a
hardware error on the alternate disk and Metastat shows :

d2: Submirror of d0
    State: Needs maintenance
    Invoke: metareplace d0 c0t1d0s0 <new device>

Metadb -i :
       flags           first blk       block count
     a m  p  luo        16              1034            /dev/dsk/c0t0d0s3
     a    p  luo        1050            1034            /dev/dsk/c0t0d0s3
     a    p  luo        2084            1034            /dev/dsk/c0t0d0s3
      W   p  l          16              1034            /dev/dsk/c0t1d0s3
      W   p  l          1050            1034            /dev/dsk/c0t1d0s3
      W   p  l          2084            1034            /dev/dsk/c0t1d0s3

There are only 2 slices and the other slice (swap partition) is fine.

Before replacing the problem hard disk which requires a reboot (as these
are internal disks) do you need to break the mirror first ?  Or, just shut
down the system, replace the hard disk, boot, partition and recreate the
metadb on the new drive and synchronise the mirror ?

Much appreciated.

Yingha.