Help finding a Unix friendly RAID 1 backup Post: 302522986

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Special Forums Hardware Filesystems, Disks and Memory Help finding a Unix friendly RAID 1 backup Post 302522986 by Corona688 on Tuesday 17th of May 2011 12:09:13 PM

05-17-2011

Registered User

Glad it worked for you.

I needed to do some more research into rsync, I hadn't used it lately, but understand it a bit better now.

If you want to synchronize the contents of the two drives, I'd stick to just updating the /home/ partition, that seems to be where all the changing data is kept:

Plug in the USB drive, and run fdisk -l to see what it shows up as. Your internal disk showed up as sda, so I suspect the external will show up as sdb, but best not to assume.
Mount the external drive's home directory onto /mnt/external. To do this, mkdir -p /mnt/external ; mount /dev/sdb6 /mnt/external.
Use rsync to copy new files to the drive. rsync --dry-run -r -a -H /home/ /mnt/external
Optionally, if you want, use rsync to delete files from /mnt/external that no longer exist in /home/ rsync --dry-run -r --delete -a -H /home/ /mnt/external
umount /mnt/external && sync wait for it to finish and then it will be safe for you to remove the USB drive, if you want to.

Note how I'm doing

Code:

rsync ... /path/ /path2

Having the exact right number of slashes is crucial.

Also, for the record, the various flags I'm giving it have these meanings:

Code:

-r    Recursively, so it checks folders in folders in folders
--dry-run    Only says what it's copying or deleting and doesn't actually do it!
                  Remove when you're confident it's copying what you want where you want.
--delete      Removes files not found in the source from the destination
-a               Preserves many things like ownership and timestamps
-H              Preserves hard links.  May not be necessary, and may improve performance to leave out.

Last edited by Corona688; 05-17-2011 at 01:14 PM..

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db2bak

DB2BAK(8)						      System Manager's Manual							 DB2BAK(8)

NAME

       db2bak - Directory Server script for making a backup of the database

SYNOPSIS

       db2bak [archivedir] [-Z serverID] [-q] [-h]

DESCRIPTION

       Creates a backup of the database.  This script can be executed while the server is running or stopped.

OPTIONS

       A summary of options is included below:

       archivedir
	      The full path to the directory to store the backup.

       -Z Server Identifier
	      The server ID of the Directory Server instance.  If there is only one instance on the system, this option can be skipped.

       -q
	      Quiet mode.  Reduces output of task.

       -h
	      Display the usage.

EXAMPLE

       db2bak -Z instance2

	      Makes a backup of the entire database for 'instance2', and stores it in the default server instance backup directory.

       db2bak /LDAP/backups/20130305

	      Creates a backup of the database and stores it in specified location.

DIAGNOSTICS

       Exit status is zero if no errors occur.	Errors result in a non-zero exit status and a diagnostic message being written to standard error.

AUTHOR

       db2bak was written by the 389 Project.

REPORTING BUGS

       Report bugs to http://bugzilla.redhat.com.

COPYRIGHT

       Copyright (C) 2013 Red Hat, Inc.

								    Mar 5, 2013 							 DB2BAK(8)