Solaris 10 won't boot. Entering System Maintenance Mode.... mount -m -o remount,rw /

After installing system related patches, system won't boot to multi-user mode. Its stopped in single-user mode (System Maintenance Mode). The root filesystem (/) flagged as Read-Only filesystem. Fsck doesn't work. Even with fsck from booting from cdrom. The problem persist. Later on found that "mount -m -o remount,rw /" fixed the problem.

Following is the system console log during recovery:
ok> boot -s
Rebooting with command: boot -s
SunOS Release 5.10 Version Generic_118833-36 64-bit
Copyright 1983-2006 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
Hardware watchdog enabled

svc.configd: smf(5) database integrity check of:
/etc/svc/repository.db
failed. The database might be damaged or a media error might have
prevented it from being verified. Additional information useful to
your service provider is in:
/etc/svc/volatile/db_errors
The system will not be able to boot until you have restored a working
database. svc.startd(1M) will provide a sulogin(1M) prompt for recovery
purposes. The command:
/lib/svc/bin/restore_repository
can be run to restore a backup version of your repository. See
http://sun.com/msg/SMF-8000-MY for more information.
Requesting System Maintenance Mode
svc.configd exited with status 102 (database initialization failure)

Root password for system maintenance (control-d to bypass):
single-user privilege assigned to /dev/console.
Entering System Maintenance Mode

Apr 30 09:05:31 su: 'su root' succeeded for root on /dev/console
Sun Microsystems Inc. SunOS 5.10 Generic January 2005
Sourcing //.profile-EIS.....
root@ #

As descibed above, the system won't start. It need the working database to be restored.
root@ # /lib/svc/bin/restore_repository
No luck. System complaining that the root filesystem ( / ) is in Read-Only mode. Its need to be fix before proceed.
root@ # mount -m -o remount,rw /
Now the root filesystem become writeable, and we can start recovery.
root@ # /lib/svc/bin/restore_repository
Succeeded, then proceed restart the server with boot in normal mode.

Note:
Option on mount -m -o remount,rw
-m: Mount the file system without making an entry in /etc/mnttab.

-o remount,rw : Remount a file system with a new set of read-write options