>First of all, if the data is mostly static, rsync might work faster.

Any operation that stats the individual files - even to just look at
timestamps - takes about two weeks. Therefore it is hard for me to see
rsync as a viable solution, even though the data is mostly
static. About 400,000 files change between weekly backups.

>I take it sdc and sdd using SATA don't influence each other?

Correct.

>However you will endure a rebuild on md0 when you re-add the disk, but
>given everything is mounted read-only, you should not practically be
>doing anything

If the rebuild operation is a no-op, then that sounds like a great
idea. If the rebuild operation requires scanning over all data in both
drives, I think that's going to be at least as expensive as the
current 10 hour process.

Thanks for the suggestions so far.

Cheers,
Jeff

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