Re: [linux-lvm] pvs complains of missing PVs that are not missing

[Joe Harvell <joe.harvell@tekcomms.com>]

Le 09/10/2013 17:09, matthew patton a �crit :
> clear LVM's cache (or just disable it in lvm.conf), rescan pv, vg, lv. make sure udev is creating the necessary hooks.
>
I'm not sure how to disable the cache.  Here are my relevant settings in 
/etc/lvm/lvm.conf:

     # If set, the cache of block device nodes with all associated symlinks
     # will be constructed out of the existing udev database content.
     # This avoids using and opening any inapplicable non-block devices or
     # subdirectories found in the device directory. This setting is applied
     # to udev-managed device directory only, other directories will be 
scanned
     # fully. LVM2 needs to be compiled with udev support for this 
setting to
     # take effect. N.B. Any device node or symlink not managed by udev in
     # udev directory will be ignored with this setting on.
     obtain_device_list_from_udev = 1


     # The results of the filtering are cached on disk to avoid
     # rescanning dud devices (which can take a very long time).
     # By default this cache is stored in the /etc/lvm/cache directory
     # in a file called '.cache'.
     # It is safe to delete the contents: the tools regenerate it.
     # (The old setting 'cache' is still respected if neither of
     # these new ones is present.)
     # N.B. If obtain_device_list_from_udev is set to 1 the list of
     # devices is instead obtained from udev and any existing .cache
     # file is removed.
     cache_dir = "/etc/lvm/cache"
     cache_file_prefix = ""

     # You can turn off writing this cache file by setting this to 0.
     write_cache_state = 1


And as expected based on my setting for obtain_device_list_from_udev, 
there is no /etc/lvm/cache directorypresent:

joey@akita ~ $ sudo nano -w /etc/lvm/lvm.conf
Mot de passe :
joey@akita ~ $ ls -al /etc/lvm/
total 68
drwxr-xr-x  5 root root  4096  7 oct.  14:12 .
drwxr-xr-x 74 root root  4096  9 oct.  11:21 ..
drwx------  2 root root  4096  8 oct.  22:21 archive
drwx------  2 root root  4096  8 oct.  22:21 backup
-rw-r--r--  1 root root 45697  9 oct.  17:27 lvm.conf
drwxr-xr-x  2 root root  4096  8 oct.  19:24 profile