On 11/2/2011 11:18 PM, Sanjana wrote:
[root@bladelinux01 ~]# mount /dev/loop0 /mnt/ mount: /dev/loop0 already mounted or /mnt/ busy [root@bladelinux01 ~]# mount /dev/loop1 /mnt/ mount: /dev/loop1 already mounted or /mnt/ busy But if I remove the dm device created and try to mount the underlying block-device, I can mount both the device which took part in mirroring and I can access the data in both the disk. [root@bladelinux01 ~]# dmsetup remove raid1 [root@bladelinux01 ~]# mount /dev/loop0 /mnt/ [root@bladelinux01 ~]# ls -l /mnt/ total 51 drwx------. 2 root root 12288 Nov 2 22:32 lost+found -rw-------. 1 root root 37417 Nov 2 22:38 messages [root@bladelinux01 ~]# umount /mnt/ [root@bladelinux01 ~]# mount /dev/loop1 /mnt/ [root@bladelinux01 ~]# ls -l /mnt/ total 51 drwx------. 2 root root 12288 Nov 2 22:32 lost+found -rw-------. 1 root root 37417 Nov 2 22:38 messages Why is this behavior. any explanation, please....
Simple; the loop devices are still open by device-mapper, so mount is telling you they are busy. Just because the raid device has zero opens does not mean that it closes the underlying devices.
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