# A filter that tells LVM2 to only use a restricted set of devices.
    # The filter consists of an array of regular expressions.  These
    # expressions can be delimited by a character of your choice, and
    # prefixed with either an 'a' (for accept) or 'r' (for reject).
    # The first expression found to match a device name determines if
    # the device will be accepted or rejected (ignored).  Devices that
    # don't match any patterns are accepted.

    # Be careful if there there are symbolic links or multiple filesystem
    # entries for the same device as each name is checked separately against
    # the list of patterns.  The effect is that if any name matches any 'a'
    # pattern, the device is accepted; otherwise if any name matches any 'r'
    # pattern it is rejected; otherwise it is accepted.

    # Remember to run vgscan after you change this parameter to ensure
    # that the cache file gets regenerated (see below).

    # Include only disks hda,hdc,hdd
    filter = [ "a|/dev/hd[acd]|", "r|.*|" ]

    # 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 file is hidden in the /etc/lvm directory.
    # It is safe to delete this file: the tools regenerate it.
    cache = "/etc/lvm/.cache"

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

    # Only scan hda and hdb
    filter = [ "a|/dev/hd[ab]|", "r|.*|" ]