Liviu> Please let me know if in this situation detailed below, there Liviu> are chances of restoring the RAID 10 array and how I can do it Liviu> safely. Thank you! It depends. Do you have either of the two missing disks (/dev/sdc and /dev/sdd) available at all? Have you tried doing a badblocks recovery of either of those disks onto a replacement disk and then trying to re-assemble your array? What happens if you do: mdadm --assemble --scan or instead mdadm --assemble md99 /dev/sd[abcdef]1 Can you post the output message(s) you get when you try this? I'm not an export on how the 0.90 version of the metadata mirrors data across pairs, and then stripes across the pairs. But if you've lost both halves of a pair, then you're probably out of luck. Have you looked at the raid wiki as well? There's a bunch of good advice there. https://raid.wiki.kernel.org/index.php/Linux_Raid Good luck! And post more details of your system as well. Liviu> Liviu Petcu Liviu> # mdadm --examine /dev/sd[abcdef]2 Liviu> /dev/sda2: Liviu> Magic : a92b4efc Liviu> Version : 0.90.00 Liviu> UUID : df4ee56a:547f33ee:32bb33b1:ae294b6e Liviu> Creation Time : Fri Aug 14 12:11:48 2015 Liviu> Raid Level : raid10 Liviu> Used Dev Size : 1945124864 (1855.02 GiB 1991.81 GB) Liviu> Array Size : 5835374592 (5565.05 GiB 5975.42 GB) Liviu> Raid Devices : 6 Liviu> Total Devices : 6 Liviu> Preferred Minor : 1 Liviu> Update Time : Thu Sep 19 21:05:15 2019 Liviu> State : active Liviu> Active Devices : 4 Liviu> Working Devices : 4 Liviu> Failed Devices : 2 Liviu> Spare Devices : 0 Liviu> Checksum : e528c455 - correct Liviu> Events : 271498 Liviu> Layout : offset=2 Liviu> Chunk Size : 256K Liviu> Number Major Minor RaidDevice State Liviu> this 5 8 2 5 active sync /dev/sda2 Liviu> 0 0 8 18 0 active sync /dev/sdb2 Liviu> 1 1 0 0 1 faulty removed Liviu> 2 2 0 0 2 faulty removed Liviu> 3 3 8 66 3 active sync /dev/sde2 Liviu> 4 4 8 82 4 active sync /dev/sdf2 Liviu> 5 5 8 2 5 active sync /dev/sda2 Liviu> /dev/sdb2: Liviu> Magic : a92b4efc Liviu> Version : 0.90.00 Liviu> UUID : df4ee56a:547f33ee:32bb33b1:ae294b6e Liviu> Creation Time : Fri Aug 14 12:11:48 2015 Liviu> Raid Level : raid10 Liviu> Used Dev Size : 1945124864 (1855.02 GiB 1991.81 GB) Liviu> Array Size : 5835374592 (5565.05 GiB 5975.42 GB) Liviu> Raid Devices : 6 Liviu> Total Devices : 6 Liviu> Preferred Minor : 1 Liviu> Update Time : Thu Sep 19 21:05:15 2019 Liviu> State : active Liviu> Active Devices : 4 Liviu> Working Devices : 4 Liviu> Failed Devices : 2 Liviu> Spare Devices : 0 Liviu> Checksum : e528c45b - correct Liviu> Events : 271498 Liviu> Layout : offset=2 Liviu> Chunk Size : 256K Liviu> Number Major Minor RaidDevice State Liviu> this 0 8 18 0 active sync /dev/sdb2 Liviu> 0 0 8 18 0 active sync /dev/sdb2 Liviu> 1 1 0 0 1 faulty removed Liviu> 2 2 0 0 2 faulty removed Liviu> 3 3 8 66 3 active sync /dev/sde2 Liviu> 4 4 8 82 4 active sync /dev/sdf2 Liviu> 5 5 8 2 5 active sync /dev/sda2 Liviu> /dev/sde2: Liviu> Magic : a92b4efc Liviu> Version : 0.90.00 Liviu> UUID : df4ee56a:547f33ee:32bb33b1:ae294b6e Liviu> Creation Time : Fri Aug 14 12:11:48 2015 Liviu> Raid Level : raid10 Liviu> Used Dev Size : 1945124864 (1855.02 GiB 1991.81 GB) Liviu> Array Size : 5835374592 (5565.05 GiB 5975.42 GB) Liviu> Raid Devices : 6 Liviu> Total Devices : 6 Liviu> Preferred Minor : 1 Liviu> Update Time : Thu Sep 19 21:05:16 2019 Liviu> State : clean Liviu> Active Devices : 4 Liviu> Working Devices : 4 Liviu> Failed Devices : 2 Liviu> Spare Devices : 0 Liviu> Checksum : e52ce91f - correct Liviu> Events : 271499 Liviu> Layout : offset=2 Liviu> Chunk Size : 256K Liviu> Number Major Minor RaidDevice State Liviu> this 3 8 66 3 active sync /dev/sde2 Liviu> 0 0 8 18 0 active sync /dev/sdb2 Liviu> 1 1 0 0 1 faulty removed Liviu> 2 2 0 0 2 faulty removed Liviu> 3 3 8 66 3 active sync /dev/sde2 Liviu> 4 4 8 82 4 active sync /dev/sdf2 Liviu> 5 5 8 2 5 active sync /dev/sda2 Liviu> /dev/sdf2: Liviu> Magic : a92b4efc Liviu> Version : 0.90.00 Liviu> UUID : df4ee56a:547f33ee:32bb33b1:ae294b6e Liviu> Creation Time : Fri Aug 14 12:11:48 2015 Liviu> Raid Level : raid10 Liviu> Used Dev Size : 1945124864 (1855.02 GiB 1991.81 GB) Liviu> Array Size : 5835374592 (5565.05 GiB 5975.42 GB) Liviu> Raid Devices : 6 Liviu> Total Devices : 6 Liviu> Preferred Minor : 1 Liviu> Update Time : Thu Sep 19 21:05:16 2019 Liviu> State : clean Liviu> Active Devices : 4 Liviu> Working Devices : 4 Liviu> Failed Devices : 2 Liviu> Spare Devices : 0 Liviu> Checksum : e52ce931 - correct Liviu> Events : 271499 Liviu> Layout : offset=2 Liviu> Chunk Size : 256K Liviu> Number Major Minor RaidDevice State Liviu> this 4 8 82 4 active sync /dev/sdf2 Liviu> 0 0 8 18 0 active sync /dev/sdb2 Liviu> 1 1 0 0 1 faulty removed Liviu> 2 2 0 0 2 faulty removed Liviu> 3 3 8 66 3 active sync /dev/sde2 Liviu> 4 4 8 82 4 active sync /dev/sdf2 Liviu> 5 5 8 2 5 active sync /dev/sda2
