Hacksaw wrote:
I have a Linux system with 2 identical disks for the OS portion. The
goal is to have them essentially mirrored, but not continuously. I want
to be able to rsync them on occasion.
I need this disk to be bootable on a moments notice, in case the main
one dies.
The layout of the current boot disk is a partition for /boot which is
ext3, and then the rest as a LVM set, of essentially one large partition.
My first thought is to create the second disk pretty much as the first
was created, do the rsyncs, and make some script that will maintain the
configuration files which mention the physical disks.
I have to admit that it's unclear what they all are.
In fact, I'd prefer something clever with disk labels.
In the best of all possible worlds, the system would recognize the
bootable partitions, and fail over to the backup one if there was a
problem with the main one.
I would appreciate some advice here. I need this machine to go live in a
few days, as the server it's replacing is close to just falling over
after more than 6 years of active service, all honor to it.
Some people like using LVM for system/OS disks - I don't. So I would
ditch the LVM and use software raid1. I don't understand why you
wouldn't want the disks to be constantly in sync. What if they're out of
sync when a disk dies? However, you could break and rebuild the mirror
at your whim when using sw raid.
--Toby
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