If you look at the top of the file you'll see:
/*
* Mirror one arena partition onto another.
* Be careful to copy only new data.
*/
Now if you combine this with some of the information from venti(8):
The data log is logically split into sections called arenas,
typically sized for easy offline backup (e.g., 500MB). A
data log may comprise many disks, each storing one or more
arenas. Such disks are called arena partitions. Arena par-
titions are filled in the order given in the configuration.
My best guess is that this is an incremental backup tool, where you give it a
source and destination arena partition and the code looks at both, figures out
the deltas, then copies over only what is needed. The venti code is a bit
inscrutable and I'm no venti guy so take this with a grain of salt.
------------------------------------------
9fans: 9fans
Permalink:
https://9fans.topicbox.com/groups/9fans/Tca0eb0fbb2404e31-M193f031acea0a531d106af6c
Delivery options: https://9fans.topicbox.com/groups/9fans/subscription
