Solaris

i tried by giving boot -ar. It started with following details:
1.boot device: /pci@1f,0/pci@1,1/scsi@2/disk@0,0:a
2.enter file name [kernel/unix]: I gave return as i am not sure.
3.enter default directory for modules[/platform/sunw;ultrsparc-IIi-c Engine/kernel /platform/sun4u/kernel /kernel /usr/kernel: I gave return as i am not sure.
4.enter system file [etc/system]: i select etc.
5.Warning: unknown command 'hostname' on line 16 of etc.
6. Warning: unknown command 'hostfinal' on line 17 of etc.
7.The /etc/path-to-inst on your system does not exist or empty.
8 do you want to rebuild this file [n]? i select y.
9. root file system type [ufs]: i select ufs.
10.enter physical name of root devicesame as shown in line no.1 ): i gave return.
11. /dev/rdsk/c0t0d0s0: unexpected inconsistency run fsck manually
12. fsck -F ufs /dev/rdsk/c0t0d0s0 command i gave.
13. it ask to remove path_to_inst : given yes.
after completion of fsck with 'file system was modified'
14.exit csh .
15.ask to 'type control -d to proceed with normal startup or give root password for system maintenance.
15. after root password i checked /etc and do not find path-to-inst.
after shutdown when reboot the same
can not open /etc/path_to_inst.
come to ok prompt after termination.

what can i do now?

boot again with "boot -ar", if that doesn't work you will need to boot in single user mode from a CD/DVD or the network and fsck the root filesystem, then boot again with "boot -ar"

The "enter physical name of root device" is the tricky part of this procedure. Something like "/pseudo/md@0:0,0,blk" might have been the right response if the root volume is mirrored. Some other string would be needed if veritas vm was being used but I have no idea what it would be. If the root voume was mirrored, I would be afraid the the mirror might now be out of sync, so I would probably break the mirror and if I get the box rebooted, remirror. I recently posted my procedure to break a mirror, but I have never done it in conjunction with rebuilding path_to_inst.

Thank u. I have solved the problem with your advice and others views.