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Joseph
 Post subject: NL CPG, RAID 6?
PostPosted: Mon Jan 12, 2015 5:03 pm 

Joined: Sun Feb 02, 2014 6:34 pm
Posts: 4
Guys, does anyone advise reasoning behind this best practice?

Best practice: NL CPGs should be of the RAID 6 type by default.
The “set size” (data to parity ratio) can be changed from the default value of 8 (6+2) if the system configuration supports it. RAID 5 is not recommended with NL disks.
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Schmoog
 Post subject: Re: NL CPG, RAID 6?
PostPosted: Mon Jan 12, 2015 5:44 pm 

Joined: Wed Oct 30, 2013 2:30 pm
Posts: 242
Rebuild time with the nl drives is very long. Think hours at best, days in some cases, so you want the additional protection in case of multiple failures in a short period of time
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afidel
 Post subject: Re: NL CPG, RAID 6?
PostPosted: Mon Jan 12, 2015 11:01 pm 

Joined: Tue May 07, 2013 1:45 pm
Posts: 216
BER is also several orders of magnitude worse on NL so you have to worry about URE during rebuild.
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Joseph
 Post subject: Re: NL CPG, RAID 6?
PostPosted: Wed Jan 14, 2015 6:01 pm 

Joined: Sun Feb 02, 2014 6:34 pm
Posts: 4
Thanks for clarification guys!
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