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Restoring files form old HDD using rsync this process can be used to restore cpanel serves.

If your old HDD is /dev/hdb3 then mount using the follwing command

mount /dev/hdb3 /old

Run rysnc to copy the files needed as per your requirements.

rsync is a file transfer program capable of efficient remote update via a fast differencing algorithm.

Usage: rsync [OPTION]... SRC [SRC]... DEST

  or   rsync [OPTION]... SRC [SRC]... [USER@]HOST:DEST
  or   rsync [OPTION]... SRC [SRC]... [USER@]HOST::DEST
  or   rsync [OPTION]... SRC [SRC]... rsync://[USER@]HOST[:PORT]/DEST
  or   rsync [OPTION]... [USER@]HOST:SRC [DEST]
  or   rsync [OPTION]... [USER@]HOST::SRC [DEST]
  or   rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]

Options

-v, --verbose               increase verbosity
-r, --recursive             recurse into directories
-p, --perms                 preserve permissions
-l, --links                 copy symlinks as symlinks
-o, --owner                 preserve owner (super-user only)
-g, --group                 preserve group
-D                          same as --devices --specials
-t, --times                 preserve modification times
-H, --hard-links            preserve hard links

rsync -vrplogDtH /old/usr/local/apache/conf /usr/local/apache
rsync -vrplogDtH /old/var/named /var
rsync -vrplogDtH /old/home/* /home
rsync -vrplogDtH /old/usr/local/cpanel /usr/local
rsync -vrplogDtH /old/var/lib/mysql /var/lib
rsync -vrplogDtH /old/var/cpanel /var
rsync -vrplogDtH /old/usr/share/ssl /usr/share
rsync -vrplogDtH /old/var/ssl /var
rsync -vrplogDtH /old/usr/local/cpanel/3rdparty/mailman /usr/local/cpanel/3rdparty
rsync -vrplogDtH /old/var/log/bandwidth /var/log
rsync -vrplogDtH /old/usr/local/frontpage /usr/local
rsync -vrplogDtH /old/var/spool/cron /var/spool
rsync -vrplogDtH /old/root/.my.cnf /root
rsync -vrplogDtH /old/etc/httpd/conf/httpd.conf /etc/httpd/conf
rsync -vrplogDtH /old/etc/sysconfig/network /etc/sysconfig

step 2

cd /old/etc

rsync -vrplogDtH secondarymx domainalias valiases vfilters exim* proftpd* pure-ftpd* passwd* group* *domain* *named* wwwacct.conf cpupdate.conf quota.conf shadow* *rndc* ips* ipaddrpool* ssl hosts /etc

step 3

/scripts/upcp; /scripts/updatenow; /scripts/sysup; /scripts/fixeverything; /scripts/exim4

Reference http://forum.ev1servers.net/