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Drives are very cheap these days. Would it be worth it to increase the group size from 2 to 3. I found 1TB drives for $60. I feel as if the array is very vulnerable to failure in a 2 group setup since drive failures are tightly correlated and it would be worth adding another drive to each RAID 10 group for the added redundancy (all 3 drives per group have to fail). Am I better off going this route, or sticking to a 2 drive per group setup. What would be considered "best practice".

Basically:

1TB
1TB

1TB
1TB

1TB
1TB

-vs-

1TB
1TB
1TB

1TB
1TB
1TB

I like RAID 10 setups due to their simplicity.

oooooo3333
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2 Answers2

3

If you're looking to be able to withstand double-drive failures to any disks in the array (not possible with two-member-per-mirror RAID 10s), you may want to consider RAID 6 instead.

As for what is "best practice" I'll say that you almost never see a triple mirror anywhere.

MDMarra
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1

"Triple mirroring" is what you're speaking of.

The ability to execute this is a function of your RAID controller setup and/or software capabilities.

sysadmin1138
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ewwhite
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