I have a 12 disk raid6 array that I can no longer assemble. When I
booted I got dumped into the dracut recovery shell and manually
assembling the array yielded...
# mdadm --assemble /dev/md2 /dev/dm-3 /dev/sd[e-lu-x]1
md/raid:md2: device sde1 operational as raid disk 0
md/raid:md2: device sdx1 operational as raid disk 11
md/raid:md2: device sdw1 operational as raid disk 10
md/raid:md2: device sdv1 operational as raid disk 9
md/raid:md2: device sdu1 operational as raid disk 8
md/raid:md2: device sdl1 operational as raid disk 7
md/raid:md2: device sdk1 operational as raid disk 6
md/raid:md2: device sdj1 operational as raid disk 5
md/raid:md2: device sdi1 operational as raid disk 4
md/raid:md2: device sdh1 operational as raid disk 3
md/raid:md2: device sdg1 operational as raid disk 2
md/raid:md2: device sdf1 operational as raid disk 1
md/raid:md2: raid level 6 active with 12 out of 12 devices, algorithm 2
md/raid:md2: Cannot get enough stripes due to memory pressure. Recovery
failed.
md/raid:md2: failed to run raid set.
md: pers->run() failed ...
md: md2 stopped.
RUN_ARRAY /dev/md2: Input/output error
The journal is on LVM volume /dev/dm-3 and is 2GB. It's sitting on a
raid10 of 4 SSDs.
The system has 16GB of RAM and 8GB of swap. Memory looks good:
# free
total used free shared buff/cache
available
Mem: 16327416 242296 15930344 1216 154776 15821820
Swap: 8388604 0 8388604
The prior shutdown could have been unclean for the array. The shutdown
process got stuck and I eventually had to use the reset button.
I have a second (8 drive) raid6 array on this host that has a 2GB
journal and it won't assemble either.
Kernel: 4.13.10-100.fc25.x86_64
What can I do? Do I need more RAM?
--Larkin
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