"Help finding a Unix friendly RAID 1 backup"

Post #302522986 by Corona688 on Tuesday 17th of May 2011 12:09:13 PM

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:
  1. 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.
  2. Mount the external drive's home directory onto /mnt/external. To do this, mkdir -p /mnt/external ; mount /dev/sdb6 /mnt/external.
  3. Use rsync to copy new files to the drive. rsync --dry-run -r -a -H /home/ /mnt/external
  4. 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
  5. 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
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:
-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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