[SOLVED] RAID not persisting after reboot

jjstinger72 · 04-29-2014, 11:23 PM

I'm at my wits end. I've rebuilt this RAID a half a dozen times. I create it. i format it. i wait 2 hrs for it to sync. i mount a directory to it. i add files. i add it to /etc/fstab (by device, by UUID, i've even tried by LABEL, all 'work'). i test performance with dd... i reboot, and it all goes away. What am i missing?? as an aside, when i rebuild the RAID, it warns that they look like their part of a raid already. fdisk shows no partition. mdstat is empty. no sign of md0 or md0p1 anywhere

this is a continuation of this thread
http://www.linuxquestions.org/questi...78#post5160478

Code:

mdadm -v --create /dev/md0 --level=raid10 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1

mkfs.ext4 -v -m .1 -b 4096 -E stride=256,stripe-width=512 /dev/md0p1

watch cat /proc/mdstat

any thoughts would be appreciated!! Thanks guys/gals!

smallpond · 04-30-2014, 11:54 AM

Did you have an mdadm.conf file? The kernel will only only automatically assemble raid sets if the md code is built-in, otherwise the array is assembled by init scripts. To add your array to the file do:

Code:

mdadm --detail --scan >> /etc/mdadm/mdadm.conf

jjstinger72 · 04-30-2014, 09:00 PM

sweet... thank you so much. I was mdadm stuff into /etc/mdadm.conf by mistake. works like a dream now!!!