On Mon, August 29, 2011 10:46, James B. Byrne wrote:
Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only. Error: /dev/sr0: unrecognised disk label
I discover that this is caused by a piece of OEM software that is embedded in ROM in the LG DVD-RW drive that was 'formerly' installed on this system. This device has been replaced.
However, I am still concerned about what the rest of this message means and its implications:
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
I have tried using partprobe and /sbin/blockdev -rereadpt /dev/sda and both report that the device /dev/sda/ is busy. Is this an artifact of using of SATA style disks or has something changed between CentOS-5.6 and CentOS-6.0 that specifically relates to this problem? On 5.6 I can create new lvms, mount and use them without a reboot. On 6.0 I cannot, for the moment at least, discover how this is done.