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Spin up/Spin Down

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Can someone point me to a good explaination to disk spinning up/down.  Is this just for reading the disk not copying to the array?

Can someone point me to a good explaination to disk spinning up/down.  Is this just for reading the disk not copying to the array?

Disks spin down after a period of inactivity.  (you can select the period)

Disks spin up when accessed for the data on them, or when written to.

 

There exist spin-up-groups as some disk controllers will pause/suspend all activity on a given disk while others in the same group are spinning up.  This will cause a pause in music/movies being played when a disk in the same disk controller group is spinning up.    For that reason, to make these "pauses" in the music less of a bother, unRAID can spin up all in a given group at the same time when any in the group are accessed.  (trading power efficiency for usability)

 

Most IDE disk controllers paired the master/slave channels as a group.  Some SATA controllers have no grouping needed, others do.  unRAID attempts to set these for you based on the underlying devices.

 

It is as simple as that.

 

 

 

 

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