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conf: comment out devices/preferred_names and filter setting

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This avoids creating void matchers which have no effect anyway and
they just use resources. Also, it makes lvm dumpconfig --type diff
to mark these settings properly as not being different from defaults
(where by default, devices/preferred_names as well as devices/filter
are void).

Also, add a few comments about builtin rules used to select device
alias in case preferred_names is not defined or it doesn't match
any of device aliases.
This commit is contained in:
Peter Rajnoha 2014-07-08 10:22:59 +02:00
parent f6001465ef
commit f76879ba44
1 changed files with 21 additions and 2 deletions
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23
conf/example.conf.in
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@ -53,11 +53,30 @@ devices {
# same block device and the tools need to display a name for device,
# all the pathnames are matched against each item in the following
# list of regular expressions in turn and the first match is used.
preferred_names = [ ]
# By default no preferred names are defined.
# preferred_names = [ ]
# Try to avoid using undescriptive /dev/dm-N names, if present.
# preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
# In case no prefererred name matches or if preferred_names are not
# defined at all, builtin rules are used to determine the preference.
#
# The first builtin rule checks path prefixes and it gives preference
# based on this ordering (where "dev" depends on devices/dev setting):
# /dev/mapper > /dev/disk > /dev/dm-* > /dev/block
#
# If the ordering above cannot be applied, the path with fewer slashes
# gets preference then.
#
# If the number of slashes is the same, a symlink gets preference.
#
# Finally, if all the rules mentioned above are not applicable,
# lexicographical order is used over paths and the smallest one
# of all gets preference.
# 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
@ -84,7 +103,7 @@ devices {
# lvmetad is used" comment that is attached to global/use_lvmetad setting.
# By default we accept every block device:
filter = [ "a/.*/" ]
# filter = [ "a/.*/" ]
# Exclude the cdrom drive
# filter = [ "r|/dev/cdrom|" ]