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DotJun

File Duplication Consistency

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1 minute ago, Jaga said:

Because MetaData is always 3x duplicated for safety.  You can't ever have a Pool without some type of duplication.

This doesn't wake a drive up after it has spun down right?

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That may depend on your automatic balancing settings.  If you have it set to run once every 24 hours, it should not poll the drives to balance (or to check duplication).  If there's no activity on the pool drives, then it shouldn't be reading them outside of whatever schedule you have set and they should continue to sleep soundly.

I can't say mine is the definitive word on this however - just logical speculation.  Christopher and Alex know far better how Metadata duplication checking works, and when it runs.

Are yours waking up with duplication off and no drive activity happening?  That can also be Scanner waking them up (if it's installed) since it likes to poll SMART regularly.

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3 minutes ago, Jaga said:

That may depend on your automatic balancing settings.  If you have it set to run once every 24 hours, it should not poll the drives to balance (or to check duplication).  If there's no activity on the pool drives, then it shouldn't be reading them outside of whatever schedule you have set and they should continue to sleep soundly.

I can't say mine is the definitive word on this however - just logical speculation.  Christopher and Alex know far better how Metadata duplication checking works, and when it runs.

Are yours waking up with duplication off and no drive activity happening?  That can also be Scanner waking them up (if it's installed) since it likes to poll SMART regularly.

Yes my drives keep waking up often and I am trying to track down the culprit.

I do have scanner, but I thought that it doesn't poll SMART if the drive is asleep?

Duplication checks are controlled by balancing?

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2 minutes ago, DotJun said:

Yes my drives keep waking up often and I am trying to track down the culprit.

I do have scanner, but I thought that it doesn't poll SMART if the drive is asleep?

Scanner will poll SMART on all connected drives on a pretty high frequency, unless you restrict it with a schedule and/or turn off it's ability to wake a drive to poll it.  I highly suspect it is Scanner that's waking the drives, and not DrivePool.

I'm unsure of duplication checks on Metadata, or when they are scheduled on a pool without duplication set otherwise.  I don't think it's the culprit here.

Try disabling "Wake up to scan" in Scanner general settings, and restrict it to a work window (mine is 5am to 11am).  Then change the S.M.A.R.T. settings and check "Do not query if the disk has spun down".  I additionally throttle queries to once every hour (60 minutes), just personal preference.

 

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7 minutes ago, Jaga said:

Scanner will poll SMART on all connected drives on a pretty high frequency, unless you restrict it with a schedule and/or turn off it's ability to wake a drive to poll it.  I highly suspect it is Scanner that's waking the drives, and not DrivePool.

I'm unsure of duplication checks on Metadata, or when they are scheduled on a pool without duplication set otherwise.  I don't think it's the culprit here.

Try disabling "Wake up to scan" in Scanner general settings, and restrict it to a work window (mine is 5am to 11am).  Then change the S.M.A.R.T. settings and check "Do not query if the disk has spun down".  I additionally throttle queries to once every hour (60 minutes), just personal preference.

 

Ok I've changed my settings to match what you suggest. Thank you for your help.

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