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Old 12-04-2007, 02:37 AM
"Paul Schulz"
Default Questions about swapping in hardware (disaster recovery) solution..

Greetings all!

I have an interesting server problem..

We (at work) are installing a new server and at the same time
preparing backup hardware should something go wrong.. The plan is to
do nightly backups to a disk in such a way that should something go
wrong we can then swap in replacement hardware and/or disk, and take
off from where the backup was done.

So.. I trying to create a Ubuntu-server system which is portable
across identical hardware, but where serial-numbers/MAC addresses will
have changed.

It is almost there, with just a couple of snags..
- grub and fstab need to refer to device names rather than UUID's (easy to fix).
- 'udev' wants to keep network device names around (looks easy to fix)
- sysklogd does not start up properly, which causes logins to stop
working (interesting to debug).
Restarting sysklogd allows logins to occur.. but I get the following error:

syslogd: unknown priority name "exec"

It's the last one I need to get to the bottom of (hence my question),
but other than this.. the idea, as a concept works quite well for us
(details below).

Does anyone have any suggestions?
[Hardware is DELL 1950 1U servers with 2x 72GB SAS drives (non-RAID)]


-- Disaster recovery methodology --

Two servers (S1,S2, geographically separated),
with two disks in each (diskA, diskB and diskC, diskD) + a couple of
spare identical drives.

Main server:
- S1-diskA, S2-diskC are Ubuntu-server installs
- S1-diskA is the main server disk (sda)
- On S1, diskB is a copy of diskA - 'dd' is used initially, then
regular rsync to maintain the copy.
(Initial dd is also done to diskD to setup partitioning.)

Backup server:
- S2-diskC is a basic install, but is used to regularly copy
S1-diskB to S2-diskD
across the network.
- S2-diskD can be swapped for a spare drive to keep rolling system backups.

- Should the disk (diskA) fail in S1, then diskB can be swapped in
and system rebooted.
- Should hardware in S1 fail, S2 can be moved in with diskA and
system rebooted.

- These operations can be tested independently on S2 hardware.

ubuntu-server mailing list
More info: https://wiki.ubuntu.com/ServerTeam

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