At Wed, 9 Jun 2010 16:50:53 -0700 CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> Hi,
>
> I've used mdadm for years now to manage software raids.
>
> The task of using fdisk to first create partitions on a spare drive
> sitting on a shelf (raid 0 were my 1st of 2 drives failed) is kind of
> bugging me now.
>
> After using fdisk to create the same partition layout on the new drive
> as is on the existing drive and then using mdadm to finish every thing
> up is a little tedious.
>
> Any one have an idea how to have a sort of hot plug were I just swap
> out the drive and it rebuilds?
sfdisk is your friend (from man sfdisk):
-d Dump the partitions of a device in a format useful as input to
sfdisk. For example,
% sfdisk -d /dev/hda > hda.out
% sfdisk /dev/hda < hda.out
will correct the bad last extended partition that the OS/2 fdisk
creates.
So:
1) plug in replacement disk.
2) partition it:
# sfdisk -d /dev/sdX | sfdisk /dev/sdY
Where /dev/sdX is an existing disk and /dev/sdY is the replacement disk
3) add the partition(s) to the array(s):
# mdadm /dev/mdI ... -a /dev/sdYI
# mdadm /dev/mdJ ... -a /dev/sdYJ
# mdadm /dev/mdK ... -a /dev/sdYK
# mdadm /dev/mdL ... -a /dev/sdYL
No reason not to put all of the above in a script...
>
>
> - aurf
> _______________________________________________
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> http://lists.centos.org/mailman/listinfo/centos
>
>
--
Robert Heller -- Get the Deepwoods Software FireFox Toolbar!
Deepwoods Software -- Linux Installation and Administration
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heller@xxxxxxxxxxxx -- Contract Programming: C/C++, Tcl/Tk
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