Can I ghost a Unix Box ? with another Post: 7288

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Top Forums UNIX for Dummies Questions & Answers Can I ghost a Unix Box ? with another Post 7288 by loadc on Monday 24th of September 2001 10:54:36 AM

09-24-2001

Registered User

ghost...no/dd...yes!!

Okay-

This is an old thread, so hopefully this helps SOMEONE...

well, ghosting is not a totally foreign concept to unix, it's just a bit "different". In unix, you have some options of doing this, take a tape backup to a device via "tar", and untar to the new disk, this implies that you have a running system on the new box. Or, this is my favorite, pull the drive out of the system you want to ghost "to", put it into the other system, now you have the option of doing *fsdumps of the slices of the "from" disk to the new disk, or, if they are IDENTICAL disks (VERY IMPORTANT!!!, do NOT do this between non-identical disks, as the disk labels go and everything in a brute force dd, you can finesse this and take just the tracks outside of the label, etc.), use the "dd" command to do an exact copy of one disk to the other. This can be dangerous, I watched someone wipeout his entire system, by "dd"-ing a blank disk to his running system, lesson here is: make sure you get the input and output devices straight. And you will be dealing with devices at this level, not filesystems, so you are writing to and from device files, not copying file systems. So keep in mind how much damage can be done to your system by doing this wrong.

Hope this helps someone,

loadc

loadc

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mkqdisk

mkqdisk(8)						      Quorum Disk Management							mkqdisk(8)

NAME

       mkqdisk - Cluster Quorum Disk Utility

WARNING

       Use of this command can cause the cluster to malfunction.

SYNOPSIS

       mkqdisk [-?|-h] | [-L] | [-f label] [-c device  -l label] [-d [-d ...]]

DESCRIPTION

       The mkqdisk command is used to create a new quorum disk or display existing quorum disks accessible from a given cluster node.

OPTIONS

       -c device -l label
	      Initialize  a new cluster quorum disk.  This will destroy all data on the given device.  If a cluster is currently using that device
	      as a quorum disk, the entire cluster will malfunction.  Do not run this on an active cluster  when  qdiskd  is  running.	 Only  one
	      device  on  the  SAN should ever have the given label; using multiple different devices is currently not supported (it is expected a
	      RAID array is used for quorum disk redundancy).  The label can be any textual string up to 127 characters - and is therefore  enough
	      space to hold a UUID created with uuidgen(1).

       -f label
	      Find the cluster quorum disk with the given label and display information about it.

       -L     Display information on all accessible cluster quorum disks.

       -d     Increase debugging level.  Specify multiple times for more information.  Currently, specifying more than twice has no effect.

SEE ALSO

       qdisk(5), qdiskd(8), uuidgen(1)

								     July 2006								mkqdisk(8)