Error:
When you try to open volume groups page from open filer, either its hang or take too long to open and at the same time you see bellow error log ..
Jan 12 09:07:44 filer2 kernel: end_request: I/O error, dev fd0, sector 0
Jan 12 09:07:44 filer2 kernel: Buffer I/O error on device fd0, logical block 0
Solution [...]