Disk Replication over the Network

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To: sunmanagers@sunmanagers.org
Date: Tue, 28 Oct 2003 15:47:11 +1300

Hi Managers.

We currently have two V880's running in seperate Datacentres as our
primary/DR machines. Both these machines run Universe Databases, about 15G
worth of data all up. The two machines are about 20km away from each other
and have a 100MB/s link between them. Currently we rcp the data across
during the night. This means that if we lose our Primary machine at 4:50pm,
we're down a whole day of data. I'd like to move to a system that means we
can have the DR machine updated far more frequently, realtime would be the
best outcome however I don't know how obtainable that is.

Universe stores all it's data as flat files so I looked at splitting a disk
off from the mirror ( 3 way mirror) and rsyncing that data across to the dr
machine then plugging the disk back in. However this would take too long as
we have some 700M files that change quite regulary. Rsync takes quite a
while to go over these and simply doesn't make changes to the file on the DR
machine, it builds another 700M file then moves it over the top. Universe
has it's own replication however it's expensive and there are certain types
of Universe files it won't replicate.

Ultimately I'd like a solution that's cheap, reliable and quick, however
after a bit of digging I can't see very many other options out there. Any
help would be greatly appreciated :) I'll summarise after.

Kind regards

Tony Jenness
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