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post #4321 of 4322 Old Today, 12:36 AM
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Originally Posted by Ken.F View Post
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.
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post #4322 of 4322 Old Today, 12:56 AM
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Originally Posted by DotJun View Post
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.
Snapraid sync is the same as FlexRAID update. Snapraid scrub -p 100 is the same as FlexRAID verify (both products can also do partial array verifies). Snapraid diff is the same as FlexRAID quick-validate. Snapraid has no analog to FlexRAID validate. Also note that the speed reports are not comparable, you may get a reading of 20MBps in FlexRAID and 500MBps in snapraid, when in reality they are both processing exactly the same data and will finish at the same time. FlexRAID essentially reports the weakest link, while Snapraid sums up the totals across all drives being read/written. The FlexRAID method is a little more "sane" as far as a relevant number goes because it's equally valid no matter how many drives are in the array. The snapraid number is artificially inflated by simply adding new drives, even when the resulting process ends up taking longer than it did with fewer drives.

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