Gordon McLellan wrote:
Les,
That's pretty much my problem. I was hoping to kill two birds with
one stone here. First order of business is to replace the single
drive with a raid array. Second order was to replace a single iscsi
server with duo of machines. If one machine had some sort of
non-recoverable problem, the other could pick-up the torch and carry
on, even if that means I need to "flip a switch" to make it happen.
My solution for semi-critical stuff (i.e. a few minutes of downtime
won't cost the 6 figures it would take to prevent it) has been to use
RAID1 in a chassis with hot-swap carriers and keep a spare chassis
handy. That way the common case of a disk failure doesn't even cause a
slowdown and you can rebuild at an off-peak time without shutting down
and in the much less likely case of a motherboard failure you yank the
drives, put them in the other box and reboot. But, that means you are
probably limited to 6 disks total with half used as mirrors and you
still need backups for software or site disasters.
The next step up from this would be DRBD to keep hot copies on the spare
machine but I've always gotten away with one spare chassis for several
active servers (and sometime using it for testing other things too...).
You do need to know about the NIC hardware address in
/etc/sysconfig/ifcfg-eth? when swapping disks around, though.
--
Les Mikesell
[EMAIL PROTECTED]
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