Re: Migrating to a RAID 1 setup (hardware RAID)

On Sun, 23 Apr 2006 21:03:40 -0400, John-Paul Stewart <jpstewart@xxxxxxxxxxxxxxxx> wrote:


AZ Nomad wrote:
On Sun, 23 Apr 2006 13:41:58 -0400, John-Paul Stewart <jpstewart@xxxxxxxxxxxxxxxx> wrote:



Doug.Baggett@xxxxxxxxx wrote:

I have a Slackware 10.2 system (but this question really apples to any
distribution).

I picked up a used 3ware 7500-4LP RAID card and would like to use it
with my current LINUX system which is currently configured on a 30GB
drive.

What is the proper way to migrate the system?


The easiest is to buy two identical disks for your RAID-1 array, create
the array using 3ware's configuration methods, and then copy your
existing stuff over to the array using 'cp -a' or 'tar' or 'rsync' or
whatever method you prefer. Then edit /etc/lilo.conf (or grub's
configuration file, if that's what you use) to point to the array and
re-run LILO. Shutdown, remove the old hard drive, and then boot from
the new array.


Have you ever actually tried that? You do NOT use the file system to
mirror a drive!

I didn't say to use the filesystem to mirror it. I said to "create the
array" and "then copy your existing stuff over" (instead of having to
re-install everything).


'cp -a', 'tar', 'rsync' all use the file system. They will all create
nonidentical mirrors which will be destroyed the first time the
raid s/w or h/w writes the same sectors from the nonidentical first
drive.
.

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