Hello, I updated the firmware op the raid controller to the last version (6.34) but this doesn't help. I have seen that I didn't read carefully your last comment and was not looking in the correct library. I have then changed the file /lib/udev/rules.d/58-scsi-sgr_symlink.rules I commented first the line ENV{SCSI_IDENT_SERIAL}=="?*", ENV{DEVTYPE}=="disk", SYMLINK+="disk/by-id/scsi-S$env{SCSI_VENDOR}_$env{SCSI_MODEL}_$env{SCSI_IDENT_SERIAL}" and rebooted the system but some error messages were still present I commented then also the next line: ENV{SCSI_IDENT_SERIAL}=="?*", ENV{DEVTYPE}=="partition", SYMLINK+="disk/by-id/scsi-S$env{SCSI_VENDOR}_$env{SCSI_MODEL}_$env{SCSI_IDENT_SERIAL}-part%n" After reboot the error messages have disappear. One question: are there some drawback with these settings? Many thanks in advance Philippe