Re: Which Disks can fail?

On 21/06/2011 11:45, NeilBrown wrote:

On Tue, 21 Jun 2011 11:24:20 +0100 Jonathan Tripathy[off-list ref]
wrote:

quoted

Hi Everyone,

Use md's "single process" RAID10 with the standard near layout (which is
apperently the same as RAID1+0 in industry), which 2 drives could fail
without loosing the array?

This is what I have:

Number   Major   Minor   RaidDevice State
         0       8        5        0      active sync   /dev/sda5
         1       8       21        1      active sync   /dev/sdb5
         2       8       37        2      active sync   /dev/sdc5
         3       8       53        3      active sync   /dev/sdd5

Thanks
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Run

    man 4 md

  search for "RAID10"

  read what you find, and if it doesn't make sense, ask again.
  If it does make sense, post your answer and feel free to ask for
  confirmation.


NeilBrown

Sorry, it still doesn't make much sense to me I'm afraid.

In fact, it's confused me more - since I'm using "near", does that means that the "copy" (I'm using near=2) of a given trunk may lie on the same disk, leading to *no redundancy*??

Thanks