Hello.
Howdy! :)
Well, this can be a pretty deep topic for a monday morning :-)
Well, monday evening for some of us ;)
In my experience, the approach and solution for "remote mirroring"
really depends on two things:
1. are you doing disaster recovery, versus mirroring diversity?
I'm not actually sure, i'm currently mirroring from the one disk
device to the other over the network to cater for hardware failures,
and ''software'' failures ( such as a kernel panic and such ) the idea
was to have an 'offline' machine that would have a full copy of the
data. Although how usefull that would be in the real world is still to
be decided, however currently i've got it clipped into a few other
bits like Heartbeat and such, so it'll do a full failover and move,
but i'm probably going to remove that due to the 'extra layer of
complexity creating more complex problems'
so I suppose that'd put me into the 'disaster recovery' class.
2. how far apart are the mirrored devices?
about 15cm-20cm ( via crossover on seperate interfaces, not network
osmosis ) ( v20z's btw. )
Without answering those questions first, you will risk a suboptimal
solution.
Anything i missed?
Patrick
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