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Full Discussion: RAID5 multi disk failure
Top Forums UNIX for Advanced & Expert Users RAID5 multi disk failure Post 302593073 by chebarbudo on Wednesday 25th of January 2012 02:18:31 PM
Old 01-25-2012
OK, thanks to your pieces of advice, I went a little further :
I can tell that two of my 4 disks are removed from the array.
Code:
# mdadm --examine /dev/sda10 | grep 'Update Time'
    Update Time : Sun Jun  5 16:00:41 2011
# mdadm --examine /dev/sdb10 | grep 'Update Time'
    Update Time : Mon Jan 23 12:05:02 2012
# mdadm --examine /dev/sdc10 | grep 'Update Time'
    Update Time : Fri Jan 20 23:16:43 2012
# mdadm --examine /dev/sdd10 | grep 'Update Time'
    Update Time : Mon Jan 23 12:05:02 2012

One failed in june 2011, the second one failed 5 days ago.
I thought that RAID5 would turn read only as soon as one disk fails.
Does anyone knows more?
Please let's not discuss how crazy it is to have let my RAID5 run with one disk removed during 6 month. I didn't know what SMART was before now (belive me I'm reading the manual).

For more information, here is the status of the array
Code:
# mdadm --examine /dev/sdb10 | tail -6
this     1       8       26        1      active sync   /dev/sdb10

   0     0       0        0        0      removed
   1     1       8       26        1      active sync   /dev/sdb10
   2     2       0        0        2      faulty removed
   3     3       8       58        3      active sync   /dev/sdd10

Is there any chance I can resync 2 disks out of 4?

Any help will be appreciated.
 

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