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Background parity initialization

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Hello eveybody

It's my first time with Raid 50 

I've created a Raid 50 using 10 X 300G SAS HDD on DL 380 G10 with p408 controller. I found there is a message which says: 

Background parity initialization is in progress : 10% and ... . 

- Can I turn server off during this procedure and start it in another time? Or it should be complete before eveyting?

- Is it a ONE TIME process or it will repeat with any drive replacement ?

- If the answer of second question is YES, does it take a long while or cause any performance issue? I read that DELL servers don't show us new drive space before background parity initialization done . What about HPE servers? 

I thought a parity initialization with new arraived disks without any data will be complete in a few seconds! How long does it take ?


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