Prep work - Backup the entire system :

Flar , ufsdump , networker , etc

I find flar the fastest as it will give you an option for complete recovery in the event of a total abort

a good practice is to copy your /etc/system file somewhere save , I would also grab the metastat -p , metastat ,  metadb  and eeprom , outputs and keep them off the machine

metastat -p |mailx -s "meta db for target x"  me@company

repeat for any metasets !

and while we are at it .. grab the /etc/lvm directory too!

Verify Quorum flag in /etc/system
set md:mirrored_root_flag=1

backup metadb's

metadb
        flags           first blk       block count
     a m  p  luo        16              8192            /dev/dsk/c1t0d0s3
     a    p  luo        8208            8192            /dev/dsk/c1t0d0s3
     a    p  luo        16              8192            /dev/dsk/c1t0d0s4
     a    p  luo        8208            8192            /dev/dsk/c1t0d0s4
     a    p  luo        16              8192            /dev/dsk/c1t1d0s4
     a    p  luo        8208            8192            /dev/dsk/c1t1d0s4

  dd if=/dev/rdsk/c1t0d0s3 of=/<path>/metadb.c1t0d0s3 bs=2048k
  dd if=/dev/rdsk/c1t0d0s4 of=/<path>/metadb.c1t0d0s4 bs=2048k
  dd if=/dev/rdsk/c1t1d0s3 of=/<path>/metadb.c1t1d0s3 bs=2048k

 DETACH ROOT MIRROR DISK

Check which is the root meta device: df –k /
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/md/dsk/d10      66419890 8134395 57621297    13%   /

# metastat -p d10

a grab the second copy 

                    
# metadetach d10 d12
d10: submirror d12 is detached

verify with a metastat command the detach successful 

remove disk from metadb

# metadb -d /dev/dsk/c1t1d0s7

You are now ready to patch , i find localcopy to work best as Solaris 10 had some issues wth patching accross nfs!

 Patching is Successful

resilver the submirror

 # metattach d10 d12
 Add disk back into metadb

# metadb -a -c3 /dev/dsk/c1t1d0s7

resilver will take a while , you can monitor in the usual way

DISASTER - Patching has Failed , total recal required

(you need to back out the patches patchrm them one by one)

Boot using corrupt/patched environment. If the patched environment is not bootable, boot using net , cdrom.
now mount the basic device file from the old mirror disk and replace the rootdev entry in the /etc/system file (remember to edit the correct etc/system file)

vi system
details are from your saved eeprom outputs!

The details of below can be seen in step 3 output (add whatever 100,blk comes after the disk id)
example :
rootdev:/pseudo/md@0:0,100,blk
change to:
rootdev:/ssm@0,0/pci@18,600000/scsi@2/disk@1,0:a,100,blk
 

revert your vfstab back to pre svm 

Replace disk entries of / with the new disk (comment out the original and make a copy with the following)

/dev/md/dsk/d10  /dev/md/rdsk/d10 /       ufs     1       no      logging
change to
/dev/dsk/c1t1d0s0  /dev/rdsk/c1t1d0s0 /       ufs     1       no      logging

lockfs -fa;sync;sync;reboot 

now boot from your mirror disk

 if there are any remaning metadevices remove them

system will now be in a svm less pre patch state

rebuild the svm state from scratch using the now new boot disk as the primary mirror drive

  Recover Metadb from backup

if  all copies of the metadb have a problem, use dd to restore the dd backup.

Example:

dd if= /opt/sun/sdsbackup/metadb.c0t0d0s7.dd of=/dev/rdsk/c0t0d0s7 bs=2048k