>Read it again. :o) Both the external XFS journal (logdev=/dev/drbd1)
>AND the data partition (/dev/drbd0) are DRBD mirrored. It would be
>silly to have only one or the other saved in a DR scenario.
ok, i see it.
> That seems dangerous for a long-distance connection. I wonder if there
> is any way to 'snapshot' at points where you know you are in sync to a
> 2nd remote copy or alternate updates between two so one would always be
> in a known-good state?
>
This is interesting. The online-checksum based sync is something I did not
know existed. This should let you have a long distance link and only have
to transfer block-level changes. You still need to read the whole disk but
a block-by-block read on a modern raid array should get you well over
100MB/s and likely much more. That could give you a full sync of a TB in
hours instead of weeks over a WAN link.
async mode should also help you keep the remote device fairly up-to-date as
well.
I had looked at drdb long ago and have not considered if for other things
for a long time. I am currently using iscsi to share some volumes on a gfs
cluster, looks like drdb is a much more performant option.
nice.
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