master - conf: add a comment about obsolete .cache file

[Peter Rajnoha]

Gitweb:        http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=35ebc5d343e2e01b7...
Commit:        35ebc5d343e2e01b719ce15c801d522a36e54ac4
Parent:        07e4ac7b00f680ad88aa0ff4c835ea2b27eab44b
Author:        Peter Rajnoha 
AuthorDate:    Mon Jul 16 10:43:04 2012 +0200
Committer:     Peter Rajnoha 
CommitterDate: Mon Jul 16 10:43:04 2012 +0200

conf: add a comment about obsolete .cache file

---
 doc/example.conf.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/doc/example.conf.in b/doc/example.conf.in
index fbb9271..a085014 100644
--- a/doc/example.conf.in
+++ b/doc/example.conf.in
@@ -86,6 +86,9 @@ devices {
     # 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+    # N.B. This type of caching is obsolete and existing .cache
+    # file is removed if the list of devices is obtained from
+    # udev by setting the obtain_device_list_from_udev to 1.
     cache_dir = "@DEFAULT_SYS_DIR@/@DEFAULT_CACHE_SUBDIR@"
     cache_file_prefix = ""