06-30-2012
Folks, according to DM Multipath - DM Multipath Configuration and Administration
https://docs.google.com/viewer?url=h...path-en-US.pdf, page 17
"Any devices of form /dev/dm-n are for internal use only and should never be used"
The manual suggest using /dev/mapper devices in LVM/Multipath setup on RHEL6
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
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LEARN ABOUT SUNOS
ttysrch
ttysrch(4) File Formats ttysrch(4)
NAME
ttysrch - directory search list for ttyname
DESCRIPTION
ttysrch is an optional file that is used by the ttyname library routine. This file contains the names of directories in /dev that contain
terminal and terminal-related device files. The purpose of this file is to improve the performance of ttyname by indicating which subdirec-
tories in /dev contain terminal-related device files and should be searched first. These subdirectory names must appear on separate lines
and must begin with /dev. Those path names that do not begin with /dev will be ignored and a warning will be sent to the console. Blank
lines (lines containing only white space) and lines beginning with the comment character "#" will be ignored. For each file listed (except
for the special entry /dev), ttyname will recursively search through subdirectories looking for a match. If /dev appears in the ttysrch
file, the /dev directory itself will be searched but there will not be a recursive search through its subdirectories.
When ttyname searches through the device files, it tries to find a file whose major/minor device number, file system identifier, and inode
number match that of the file descriptor it was given as an argument. If a match is not found, it will settle for a match of just
major/minor device and file system identifier, if one can be found. However, if the file descriptor is associated with a cloned device,
this algorithm does not work efficiently because the inode number of the device file associated with a clonable device will never match
the inode number of the file descriptor that was returned by the open of that clonable device. To help with these situations, entries can
be put into the /etc/ttysrch file to improve performance when cloned devices are used as terminals on a system (for example, for remote
login). However, this is only useful if the minor devices related to a cloned device are put into a subdirectory. (It is important to note
that device files need not exist for cloned devices and if that is the case, ttyname will eventually fail.) An optional second field is
used in the /etc/ttysrch file to indicate the matching criteria. This field is separated by white space (any combination of blanks or
tabs). The letter M means major/minor device number, F means file system identifier, and I means inode number. If this field is not speci-
fied for an entry, the default is MFI which means try to match on all three. For cloned devices the field should be MF, which indicates
that it is not necessary to match on the inode number.
Without the /etc/ttysrch file, ttyname will search the /dev directory by first looking in the directories /dev/term, /dev/pts, and /dev/xt.
If a system has terminal devices installed in directories other than these, it may help performance if the ttysrch file is created and con-
tains that list of directories.
EXAMPLES
Example 1: A sample display of /etc/ttysrch command.
A sample /etc/ttysrch file follows:
/dev/term MFI
/dev/pts MFI
/dev/xt MFI
/dev/slan MF
This file tells ttyname that it should first search through those directories listed and that when searching through the /dev/slan direc-
tory, if a file is encountered whose major/minor devices and file system identifier match that of the file descriptor argument to ttyname,
this device name should be considered a match.
FILES
/etc/ttysrch
SEE ALSO
ttyname(3C)
SunOS 5.10 23 Feb 1994 ttysrch(4)