Originally Posted by Ken.F
Verify is a bit for bit verification of every file in the pool. I have 10 data drives with 30 TB on them so I guess 14 hours isn't too bad. I only do those once a month so it's not that inconvenient. An update will check for changes in the pool and will calculate parity just for the files that changed since the last update. That doesn't take very long unless you move a lot of data between updates. I have updates scheduled every night so it's usually pretty fast.
Ahhh ok. I'm trying out snapraid right now and it's pretty dang fast as far as the parity calcs go but the sync command that I run might be the same as the update command that you run. I'm not sure if snapraid has a verify/validate command so I guess we can't really compare them.