Comments on: With computers, bleep happens. (Part 2) A.K.A When the RAID fails. http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/ The thoughts of an Aspie on Technology, Politics, and Everything. - The Answer isn't always 42. Fri, 10 Feb 2012 12:18:11 +0000 http://wordpress.org/?v=2.1.3 By: Ryvaken http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-24 Ryvaken Wed, 28 Mar 2007 19:47:56 +0000 http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-24 I don't understand what 1+0 and 0+1 do. I don't mean what the difference between those two are, I mean I don't get them at all I don’t understand what 1+0 and 0+1 do. I don’t mean what the difference between those two are, I mean I don’t get them at all

]]> By: Josh the Aspie http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-25 Josh the Aspie Wed, 28 Mar 2007 19:59:32 +0000 http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-25 Ah. Well I'm not sure I understand the difference in the end result, but the main difference is in the order in which the drives are grouped.<br /> <br /> In 0+1 you create 2 striped drive from two other drives each. In other words you take 4 drives, and make 2 larger drives from those 4, using striping. You then take those two larger drives, and have them mirror each-other. So that when you write to the new 4 disk mega-drive, you write the same data to each cluster of 2 striped drives. These striped drives then alternate which disk they write the data too.<br /> <br /> Let's say that I have 4 disk drives. Let's call them A, B, C, and D.<br /> <br /> I put A&B together as a striped drive, and call it x and C&D together as a striped drive and call it y.<br /> <br /> Now I make sure that y and y mirror each other.<br /> <br /> 1+0 is the opposite order.<br /> <br /> You take A&B and mirror them, calling that mirror drive x. You take C&D and Mirror them as well, calling that mirror drive y.<br /> <br /> Then you stripe x and y.<br /> <br /> Does that help at all? Ah. Well I’m not sure I understand the difference in the end result, but the main difference is in the order in which the drives are grouped.

In 0+1 you create 2 striped drive from two other drives each. In other words you take 4 drives, and make 2 larger drives from those 4, using striping. You then take those two larger drives, and have them mirror each-other. So that when you write to the new 4 disk mega-drive, you write the same data to each cluster of 2 striped drives. These striped drives then alternate which disk they write the data too.

Let’s say that I have 4 disk drives. Let’s call them A, B, C, and D.

I put A&B together as a striped drive, and call it x and C&D together as a striped drive and call it y.

Now I make sure that y and y mirror each other.

1+0 is the opposite order.

You take A&B and mirror them, calling that mirror drive x. You take C&D and Mirror them as well, calling that mirror drive y.

Then you stripe x and y.

Does that help at all?

]]> By: Ryvaken http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-26 Ryvaken Wed, 28 Mar 2007 20:06:06 +0000 http://blog.joshtheaspie.com/2007/03/27/with-computers-bleep-happens-part-2-aka-when-the-raid-fails/#comment-26 OoooOOOooo. OoooOOOooo.

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