confusion about logic volume

[iambluegary]

i have question about logic volume:
i know command:
lvchange -p r /dev/vg01/lvol1 is to change lvol1 to read-only

however,my question is what can i do to affirm that the volume could be written now ,and when it change to read-only ,how can i affirm the change has been done.

of course ,i know i can check the attribution of the volume,i just wanna know other ways to do it.

[Clemens van Everdingen]

Hi,

How about when you set the lvol to read-only and try then to write a file in the lvol.

If possible it's not read only, and if not possible it's read-only.

C.

[John Carr_2]

Hi

touch testfile
ls testfile

if its there your NOT read only , the touch should fail if read only.

John.

[U.SivaKumar_2]

hi,
we can use lvchange command with following options for changing permissions.
-r - readonly
-w - read-write
To check whether this works , simple way is to
create a file in the filesystem of the logical
volume in which you assigned permission,
I an not sure about the logic how it works, but i think that some bits will get changed for that logical volume's device file(eg./dev/vg02/lvol1), when you change permission.

regards,
U.SivaKumar