On 2017-03-31, Martin Gregorie wrote:
>Looks good. I was never sysadmin for Guardian so never got involved with
>its disk management. I take it you didn't have a connection between the
>sites or not a lot of bandwidth, or IIRC you could have simply declared
>that pairs of disks on the two machines mirrored each other?

This isn't as easy as it might at first appear.

With a decent software RAID controller, it's not too hard to persuade
it that a networked remote device is just another disc onto which it
should be mirroring writers.

However, the remote disc will inevitably take longer to complete those
writes than the local one. So your local system becomes constrained by
the speed of the link. You can queue writes locally and send them over
the link as bandwidth allows, but then you don't have a current mirror
any more.

These days I'd be inclined to use ZFS snapshots every (arbitrary
interval), with incremental send.

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