And where would this backup which you need come from ? You need a backup file of some sort to be able to restore !

If you don't have a backup file you need to reconstruct it by listing the masked LUN's on each and every host (you need to do this on each host) and somehow find out to which FA each HBA is zoned to.

If you have the wwpn's of the HBA's (you can look this up in the switch configs), and the symdev numbers each host had access to you can create a script to fill the vcmd again.

symmask -sid -wwn -dir 4A -p 0 add devs symdev1,symdev2,symdev3,symdev4

symmask -sid -wwn -dir 13A -p 0 add devs symdev1,symdev2,symdev3,symdev4

so if I have a 200 hosts connected. It wld take days to rebuild the database.

well can we recover it from SFS. Since VCMDB is a part of SFS and SFS is  protected via 2-way mirr.

what do you mean by looking up in the switch config. Can you plz elaborate on it.

What are you trying to do ?

I am just thinking of a   scenario where my VCMDB is corrupted. so I need to restore it. but I dont have backup for it. 

create a script and keep multiple versions.

Do what Dynamox suggested.

What I do is create a scheduled task on a Windows with SE on it and run the script below on a daily basis. Then I backup the directory that the VCMDB backup is saved to for even more protection.

*** Begin Script ***

REM Backup of VCMDB

@echo off

echo Backing up VCMDB ...

cd "C:\Program Files\EMC\SYMCLI\bin"

symmaskdb -sid XXX backup -file C:\SAN_Scripts\VCMDB\vcmdb_backup.txt -nop

echo Renaming file to inlcude date stamp

FOR /F "TOKENS=1* DELIMS= " %%A IN ('DATE/T') DO SET CDATE=%%B
For /f "tokens=2-4 delims=/ " %%a in ('date /t') do (set date=%%a%%b%%c)

ren C:\SAN_Scripts\VCMDB\vcmdb_backup.txt "%date%_vcmdb_backup.txt"

echo VCMDB backup complete

exit

*** End Script ***

Run this script for every sym in your infrastructure.