[CentOS] Mirroring Hard Drive
kerplop at sbcglobal.net
Tue Aug 12 16:27:08 UTC 2008
> Paul R. Ganci wrote:
>> Matt wrote:
>>>> why not just put it in the machine and make it a raid1
>>>> then, if the first one dies, you just use the second one :D
>>> How do you do that?
>> Detailed step by step instructions easily modified for CentOS:
>> I haven't tried this myself ... yet but plan on it in the next few
> I haven't tried it either...yet... but there is also a version of the
> HOWTO for Fedora 8, which might require less interpolation.
> Thanks for the URL
I should have had the common decency to report that I *did* try this
howto and *was* successful. There were a couple things that caused some
1. I read somewhere that it's safest to resize the filesystems on the
existing drive before doing anything else, to allow for a 4K superblock
beginning on a 64k boundary at the end of the partition. I did that.
(Straightforward instructions at
2. In part 2, page 7, there is a step "Next replace LABEL=/boot with
/dev/md0 and LABEL=/ with /dev/md2 in /etc/mtab" that I kinda
questioned. It was my understanding that /etc/mtab is maintained by the
mount command. (From man mount: "The programs mount and umount maintain
a list of currently mounted file systems in the file /etc/mtab".)
This makes the command on page 9, "cp -dpRx / /mnt/md2" *appear* to be
copying md2 to itself. Confusion aside, the command has the desired result.
Aside from those 2 points, it went very smoothly.
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