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Thanks to @frostschutz's comment the issue appears to be due to /sys being mounted as readonly (ro). This was evident through this command: $ cat /proc/mounts |grep sys sysfs /sys sysfs ro,seclabel,relatime 0 0 none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0 This appears to be an issue with docker. I found this issue titled: sysfs goes into ...


Yes, this is normal. When you first create the array the parity blocks have to be calculated and written, which is what you are seeing. If you know that the drives are already filled with zeros, then you can use the --assume-clean switch to direct mdadm to skip the initial resync. If the drives aren't actually filled with zeros, then performing a parity ...

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