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Fix default preferred_names filter to use /dev/mapper/mpath devices.

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If these devices exist, we should be using them for multipath rather than any
underlying device names.
Reference: http://kbase.redhat.com/faq/FAQ_96_11196.shtma
bz195685
This commit is contained in:
Dave Wysochanski 2008-02-04 20:26:14 +00:00
parent f2f1da1831
commit 57b2c9d339
2 changed files with 9 additions and 3 deletions
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6
doc/example.conf
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@ -23,9 +23,11 @@ devices {
# same block device and the tools need to display a name for device, # same block device and the tools need to display a name for device,
# all the pathnames are matched against each item in the following # all the pathnames are matched against each item in the following
# list of regular expressions in turn and the first match is used. # list of regular expressions in turn and the first match is used.
preferred_names = [ ] # If device-mapper multipath is used, we should always use the mpath
# devices rather than the underlying paths.
preferred_names = [ "^/dev/mapper/mpath" ]
# preferred_names = [ "^/dev/mpath/", "^/dev/[hs]d" ] # preferred_names = [ "^/dev/mapper/mpath", "^/dev/[hs]d" ]
# A filter that tells LVM2 to only use a restricted set of devices. # A filter that tells LVM2 to only use a restricted set of devices.
# The filter consists of an array of regular expressions. These # The filter consists of an array of regular expressions. These

6
man/lvm.conf.5
View File

@ -84,7 +84,10 @@ Defaults to "/dev".
\fBpreferred_names\fP \(em List of patterns compared in turn against \fBpreferred_names\fP \(em List of patterns compared in turn against
all the pathnames referencing the same device in in the scanned directories. all the pathnames referencing the same device in in the scanned directories.
The pathname that matches the earliest pattern in the list is the The pathname that matches the earliest pattern in the list is the
one used in any output. one used in any output. As an example, if device mapper multipathing
is used, the following will select multipath device names:
.br
\fBdevices { preferred_names = [ "^/dev/mapper/mpath" ] }\fP
.IP .IP
\fBfilter\fP \(em List of patterns to apply to devices found by a scan. \fBfilter\fP \(em List of patterns to apply to devices found by a scan.
Patterns are regular expressions delimited by any character and preceded Patterns are regular expressions delimited by any character and preceded
@ -98,6 +101,7 @@ in /dev), if any name matches any \fBa\fP pattern, the
device is accepted; otherwise if any name matches any \fBr\fP device is accepted; otherwise if any name matches any \fBr\fP
pattern it is rejected; otherwise it is accepted. pattern it is rejected; otherwise it is accepted.
As an example, to ignore /dev/cdrom you could use: As an example, to ignore /dev/cdrom you could use:
.br
\fBdevices { filter=["r|cdrom|"] }\fP \fBdevices { filter=["r|cdrom|"] }\fP
.IP .IP
\fBcache_dir\fP \(em Persistent filter cache file directory. \fBcache_dir\fP \(em Persistent filter cache file directory.