One of the links show a solution by replacing disk(s) with errors, after that the system start to work fine.
So we recommend you to check your controller health and to check the storage disks, then to run file system repair tool to fix your FS if it contain any issue.
Please check this KB: http://kb.open-e.com/File-system-repair_138.html

Also please be sure that your controller Firmware is updated to the latest firmware available at your controller website.