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Old 05-08-2014, 05:30 AM   #1
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Debian - Raid6 - Boot with unknown partition table

i hope someone can help. I have a Debian Wheezy with 3 Softwareraids. md0=root, md1=swap and md2 for Data. Filesystem is ext4 Disks are 3TB.

I shrinked the Raids from 7 to 6 disks, all looks good. State was clean. Than i reboot the system and run into grub rescue mode. After searching i saw that the md0 which is for the root filesystem could mounted and sda was missing. i reassembled sda and reboot. But the problem still exists. I boot the Debian-Installer from USB and run into the Rescuemode. There i find out that the partitiontable couldnt read. I tried another boot sequence and could boot from one disk into (initframs). All 3 Raids seems clean but dmsg shows unknown partitiontable and ext4 bad geometry block count exeeds size of device.
I tried efs2check /dev/md0, got lot of errors which i all accept and let rewrited.
thats the actual stand (sorry for my english)
Need help
Old 05-08-2014, 09:47 AM   #2
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Could you post the output of:

cat /proc/mdstat
parted /dev/sda print
Old 05-09-2014, 10:12 AM   #3
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thanks for reply.
Meanwhile i will reinstall the system. Backup starts tonight. But the answer of your questions:
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md2 : active raid6 sdg4[6] sda4[0] sdf4[5] sde4[4] sdd4[3] sdc4[2] sdb4[1]
14625774080 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7] [UUUUUUU]

md1 : active raid6 sdg3[6] sda3[0] sdf3[5] sde3[4] sdd3[3] sdc3[2] sdb3[1]
9756160 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7] [UUUUUUU]

md0 : active raid6 sdg2[6] sda2[0] sdf2[5] sde2[4] sdd2[3] sdc2[2] sdb2[1]
14635520 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7] [UUUUUUU]
parted /dev/sda print
Model: ATA ST3000DM001-9YN1 (scsi)
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number Start End Size File system Name Flags
1 1049kB 99,6MB 98,6MB bios bios_grub
2 99,6MB 3100MB 3000MB root raid
3 3100MB 5099MB 2000MB swap raid
4 5099MB 3001GB 2995GB node02 raid


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