Christopher Chan wrote:
Sorry, I did not read your mail through properly. Not mounted on the
secondary, okay. Anyway, quite a fair bit off complexity there in making
sure the network block device does not get mounted by both boxes at the
same time.
Is it really worth the complexity when you can have both servers online
running off their own disks for the mail queue without having to worry
about the other guy? If the primary is so badly whatever that a queue on
mirrored disks cannot be brought back online with a simple reboot, what
chances are there that the network block device won't be a victim of the
whatever and mess up the queue so that the secondary cannot use it?
That's generally my reasoning in thinking that simple raid1 mirrors on
the primary with swappable disks and a spare powered-off chassis are
probably more robust. You do need someone on-site capable of swapping
the disks if you have a motherboard/power supply failure but with
server-class equipment and a good UPS those are pretty rare. You also
need additional backups, since an operator or software error could take
out your online filesystem including the mirrored side.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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