On 03/20/2014 02:12 AM, Jeff Allison wrote:
The gist of my question is what kind of resync speed should I expect? I have a HP N54L Microserver running centos 6.5. In this box I have a 3x2TB disk raid 5 array, which I am in the process of extending to a 4x2TB raid 5 array. I've added the new disk --> mdadm --add /dev/md0 /dev/sdb And grown the array --> mdadm --grow /dev/md0 --raid-devices=4 Now the problem the resync speed is v slow, it refuses to rise above 5MB, in general it sits at 4M.
Per second?
from looking at glances it would appear that writing to the new disk is the bottle neck, /dev/sdb is the new disk. Disk I/O In/s Out/s md0 0 0 sda1 0 0 sda2 0 1K sdb1 3.92M 0 sdc1 24.2M 54.7M sdd1 11.2M 54.7M sde1 16.3M 54.7M
Could you please send output of 'iostat -xm 1'? Also, do you anything in 'top' that takes 100% CPU?
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