[clug] OT: newbie RAID question

Carlo Hamalainen carlo.hamalainen at gmail.com
Thu Jun 3 18:42:28 MDT 2010

On Fri, Jun 4, 2010 at 10:29 AM, Michael Cohen <scudette at gmail.com> wrote:
> Yes they will. In a 3 disk RAID5 one disk is used for parity and two
> for data. The parity is usually rotated through the disks. They will
> see half the data for the blocks that dont have parity. Even with
> parity if one of the other disks is all 0 they will see the data
> (because parity of one block with data and one block with 0 is the
> data again - simple xor operation).

Thanks for confirming.

> Usually if you are a big enough organization you can just tell them
> they can not have the disk back. Im not sure for smaller organization
> you would have that negotiating power.

We're a tiny organisation inside the 2nd largest employer in
Queensland - does that count? :)

Carlo Hamalainen

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