After lot of errors and data losses have replaced all the disks.
Currently I have no problems, but I am not sure what was happened earlier errors. Is it any test command (from ssh or web interface) which can I put to push the NAS to the detail test all of their hardware?
Thank you for any replies.
See the section on Creating a Diagnostic File for Analysis in the http://download.intel.com/support/motherboards/server/ss4000-e/sb/ss4000etroubleshootingguide.pdf SS4000-E Troubleshooting Guide.