[NCLUG] sw raid, recovery after install

[Michael Milligan]

> 
> Yes, it's normal - it's building the initial version of the checksum
> data on the third drive.

It's actually syncing the parity stripes for garbage (unused by the file
system) blocks across ALL the drives which is a waste of time when
you've just done a mkfs on the array.

The parity "checksum" doesn't live on just one drive with RAID5, it's
striped across all the drives according to the stripe size and the
layout, which defaults to left-symmetric.  Google is your friend.

Regards,
Mike