RAID6 recover problem

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I have a 10 disk raid6 with internal write intent bitmap here (softraid, build and managed via mdadm). For whatever reason one of the 3 promise SATA 300 TX controllers went offline and took 4 of these 10 disks with it. After reboot the array was assembled with 8 out of 10 disks - sda2 and sdb2 missing. When I tried to re-add sda2 sdc - which is one of the "active" disks - reported a read error on sector 54631. Ok - seems I have a problem.

I stopped all activities at this point to ask here what I can do to reassemble the array with a minimum loss of data.

Except the offline disks sda2 and sdb2 all other disks report 19 dirty chunks (mdadm -X). The offline disks report 7 dirty chunks.

If one needs any further data - just ask.

Hoping for assistance
Ralf Müller



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