Hi, I have been testing my system and had expected to be able to use the "lvchange -pr" and "lvchange -prw" options to enable/disable the write access to a logical volume. It seems that although "lvs" reports the read/write status according to the most recent command, this does not reflect the true read/write access to the logical volume. It seems that you have to perform a "lvchange -an" then "lvchange -ay" to apply the read/write access rights to the logical volume. You can see an example below... This doesn't make sense and it doesn't match the man page for the lvchange command. Can anyone shed light on this ? Thanks, Roger NewWombat:~# uname -a Linux NewWombat 2.6.16.20.rwl1 #1 Fri Jun 9 15:23:04 BST 2006 i686 GNU/Linux NewWombat:~# lvm --version No such command. Try 'help'. NewWombat:~# lvs --version LVM version: 2.02.06 (2006-05-12) Library version: 1.02.07 (2006-05-11) Driver version: 4.5.0 NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -ri-a- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# dd if=/dev/zero of=/dev/clientstore/backupimage bs=64K count=1 dd: writing `/dev/clientstore/backupimage': Operation not permitted 1+0 records in 0+0 records out 0 bytes transferred in 0.015371 seconds (0 bytes/sec) NewWombat:~# lvchange -prw /dev/clientstore/backupimage Logical volume "backupimage" changed NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -wi-a- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# dd if=/dev/zero of=/dev/clientstore/backupimage bs=64K count=1 dd: writing `/dev/clientstore/backupimage': Operation not permitted 1+0 records in 0+0 records out 0 bytes transferred in 0.004415 seconds (0 bytes/sec) NewWombat:~# lvchange -an /dev/clientstore/backupimage NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -wi--- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# lvchange -ay /dev/clientstore/backupimage NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -wi-a- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# dd if=/dev/zero of=/dev/clientstore/backupimage bs=64K count=1 1+0 records in 1+0 records out 65536 bytes transferred in 0.000942 seconds (69568756 bytes/sec) NewWombat:~# lvchange -pr /dev/clientstore/backupimage Logical volume "backupimage" changed NewWombat:~# dd if=/dev/zero of=/dev/clientstore/backupimage bs=64K count=1 1+0 records in 1+0 records out 65536 bytes transferred in 0.000962 seconds (68118616 bytes/sec) NewWombat:~# lvchange -an /dev/clientstore/backupimage NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -ri--- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# lvchange -ay /dev/clientstore/backupimage NewWombat:~# lvs LV VG Attr LSize Origin Snap% Move Log Copy% backupimage clientstore -ri-a- 60.00G root clientstore -wi-ao 5.00G userdisk clientstore -wi-ao 60.00G NewWombat:~# dd if=/dev/zero of=/dev/clientstore/backupimage bs=64K count=1 dd: writing `/dev/clientstore/backupimage': Operation not permitted 1+0 records in 0+0 records out 0 bytes transferred in 0.004422 seconds (0 bytes/sec) NewWombat:~# _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/