break solaris mirror Post: 302208745

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Operating Systems Solaris break solaris mirror Post 302208745 by Perderabo on Tuesday 24th of June 2008 10:01:54 PM

06-24-2008

Administrator Emeritus

Here is my procedure...it is a little bit clunky, but it works.

You should have the openboot variable "boot-device" set to something like
"disk0 disk1". You control which side you are booting from by explicitly
mentioning in the boot command at the ok prompt. Assuming that
disk0 c1t0d0
disk1 c1t1d0
is my root fs mirror...

Boot to single user mode from the installation CD.
ok boot -s cdrom

fsck root to ensure that everthing is ok and that you have the layout right
# fsck /dev/rdsk/c1t0d0

Then mount it
# mount /dev/dsk/c1t0d0 /a

Now, the only time that I use this procedure is when the root filesystem has been damaged to the point of not booting. So this is where I would fix it. But I am only fixing one side of the mirror. This is why I must now break the mirror. So assuming that I fixed the problem....

Edit /a/etc/system and remove the line that contains
rootdev

Edit /a/etc/vfstab and change
/dev/md/dsk/d0 /dev/md/rdsk/d0 / ufs ...
to
/dev/dsk/c1t0d0s0 /dev/rdsk/c1t0d0s0 / ufs ...

Then
cd /
umount /a
and get back to ok prompt (I just hit a break, but you may not be using a serial connection)

Boot into single user mode from the disk you just edited...
ok boot -s disk0

# metaclear -f -r d0
# init 0
ok boot disk0

And you should come up on one side of the mirror.

I have used this and it works for me. But it is a dangerous procedure. I
also doubt that my procedure is optimal. So proceed at your own risk. And again, I do this only on unbootable systems (or a test system to reherse).

There may be other slices still mirrored and I leave them that way. Once the box comes up, I then remirror root with the standard procedure.

Perderabo

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LEARN ABOUT OSX

installboot

installboot(1M) 														   installboot(1M)

NAME

       installboot - install bootblocks in a disk partition

SYNOPSIS

       installboot bootblk raw-disk-device

       The boot(1M) program, ufsboot, is loaded from disk by the bootblock program which resides in the boot area of a disk partition.

       The  ufs  boot objects are platform-dependent, and reside in the /usr/platform/platform-name/lib/fs/ufs directory. The platform name can be
       found using the -i option of uname(1).

       The installboot utility is a SPARC only program. It is not supported on the  architecture.  users should use installgrub(1M) instead.

       bootblk	       The name of the bootblock code.

       raw-disk-device The name of the disk device onto which the bootblock code is to be installed; it must be a character device which is  read-
		       able and writable. Naming conventions for a SCSI or IPI drive are c?t?d?s? and c?d?s? for an IDE drive.

       Example 1: Installing UFS Boot Block

       To install a ufs boot block on slice 0 of target 0 on controller 1 of the platform where the command is being run, use:

	      example# installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk 
		   /dev/rdsk/c1t0d0s0

       /usr/platform/platform-name/lib/fs/ufs

	   directory where ufs boot objects reside.

       /platform/platform-name/ufsboot

	   second level program to boot from a disk or CD

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

       od(1), uname(1), boot(1M), init(1M), kadb(1M), kernel(1M), monitor(1M), reboot(1M), rpc.bootparamd(1M), init.d(4), attributes(5)

WARNINGS

       The installboot utility fails if the bootblk or openfirmware files do not exist or if the raw disk device is not a character device.

								    11 Apr 2005 						   installboot(1M)