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  #21 (permalink)  
Old November 13, 2012, 08:04 PM
altereDad's Avatar
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Let alone, when you have a failure the system and RAID parity changes and your system will suffer in speed until you get a new drive re-initialized.
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  #22 (permalink)  
Old November 14, 2012, 04:28 AM
Join Date: Nov 2012
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Originally Posted by JD View Post
Nope, nothing you can do but wait it out. It'll go "faster" if you stop trying to access it.

As Bluebyte and myself are saying though, you should really re-consider RAID5 at such a size in a non-enterprise environment. You're using consumer hard drives that are prone to failure and 1 drive loss means you're going to have to suffer through this whole initialize process all over again.
Ok, i'll! My RAID controller don't make raid6, witch is too bad!

I set the priority to 100% on the initialization and now it will take 4 days.

With a RAID10 i'd still get 12Tb. I'll think about it.

Thx a lot guys for all the tips!

Last edited by oliver_ssa; November 14, 2012 at 04:36 AM.
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  #23 (permalink)  
Old November 14, 2012, 06:46 PM
grinder's Avatar
Join Date: Mar 2007
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Originally Posted by JD View Post
This looks like the low-end LSI cards, it likely does not have hardware XOR ("RAID Engine") so RAID5 is always going to have terrible write speeds. It also lacks any onboard cache as well. This is a HBA product rather than a ROC product.

I would suggest doing RAID10 instead and just suck up some of the storage loss. You'll get the performance at least. Otherwise, look into buying a proper RAID controller.

My only other thought, was the array fully initialized? That should take a couple days at your capacity.
nailed it

1) Cache-less raid5 runs very very poorly, minimum 256MB memory on the controller for decent RAID5 performance, 512MB if you can afford it.
2) if you are not using enterprise class SATA/SAS drives you risk severe data corruption over time, I hope you are backing up.
3) JD's advise is solid... you will get the best overall mileage on that controller if you revert to a RAID10 setup instead of a RAID5 setup. And yes any array runs like ass unless it's fully initialized.

I would also have the RAID Web Console run regular consistency checks to preemptively find bad blocks in your drives and move the data blocks around accordingly.
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