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New PC Posted by Wren on Apr 27 2012, 2:58:46 pm PSA: Ensure your forum email address is valid Posted by MikeDB on Apr 09 2012, 8:43:16 am Recipe's Posted by MikeDB on Feb 28 2012, 12:54:29 am My PC is now ancient Posted by rovingcowboy on Feb 27 2012, 8:29:26 am Hey all Posted by rovingcowboy on Feb 27 2012, 8:35:12 am |
A highly resilient raid solution!
By Red Squirrel
Create a 6 drive raid 5 array called /dev/md0 with chunk size of 16384: (typically, bigger chunk sizes are better for bigger files, default is 512)
mdadm --create --level=5 --chunk=16384--raid-devices=6 /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg
Assemble raid array that is not in the config file:
mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg
Create config file:
mdadm --detail --scan > /etc/mdadm.conf
Add new disk and grow raid array:
mdadm --add /dev/md0 /dev/sdh mdadm --grow /dev/md0 --raid-devices=7
Mark drive as failed, and remove from array. (this can be good if you want to replace a drive even though it has not failed)
mdadm --fail /dev/md0 /dev/sdg mdadm --remove /dev/md0 /dev/sdg
Stop array: (must ensure the file system is dismounted first)
mdadm --stop /dev/md0
Start array:
mdadm --run /dev/md0
Get details on an array:
mdadm --detail /dev/md0
Monitor all arrays: (to get emails of failures and such)
mdadm --monitor --scan --mail=[email address] --delay=1800 &
View rebuild speed limit:
sysctl dev.raid.speed_limit_max
Modify rebuild speed limit:
sysctl -w dev.raid.speed_limit_max=value
Increase performance before a rebuild operation:
mdadm --grow --bitmap=internal /dev/md0
Once rebuild is done:
mdadm --grow --bitmap=none /dev/md0
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