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Full Discussion: LUNS in AIX
Operating Systems AIX LUNS in AIX Post 302429209 by shockneck on Sunday 13th of June 2010 12:40:26 PM
Old 06-13-2010
The RDAC driver creates several devices for a DS4k subsystem. For every controler connected to an FC adapter you have one dac device. Then there is one dar device that represents the complete array with all the LUNs (including active and inactive paths).
First check that with one DS4K you have one dar and two dacs only. Second look into the long error message (errpt -a). As there seems to be a problem from each of your DS4K controllers and the problem survived a reboot the cause may lay behind the AIX server (e.g. cabling, switch, LUN configuration).
 

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DAR_SLAVE(1)						      General Commands Manual						      DAR_SLAVE(1)

NAME
dar_slave - disk archive slave for remote access to a dar archive SYNOPSIS
dar_slave [options] [<path>/]source dar_slave -h dar_slave -V DESCRIPTION
dar_slave reads an archive and listens for dar orders on standard input, sending asked parts of the archive on standard output. Source is the basename of the archive to read. By default, dar_slave uses standard input and output to communicate with a dar process, which may be running on the local host or on a remote host. It is possible to change the behavior of dar_slave to use named pipe instead of standard input and output OPTIONS
-h Displays help usage. -V Displays version information. -i <filename> reads the orders from the named file instead of standard input. In most cases the filename will be a named pipe. -o <filename> sends the data to the named file <filename> instead of standard output. In most cases the filename will be a named pipe. -E <string> string is a command to be launched between slices. See dar(1) man page (same option) for more information. -Q Do not display any message on stderr when not launched from a terminal (for example when launched from an at job or crontab). Remains that any question to the user will be assumed a 'no' answer, which most of the time will abort the program. -j when virtual memory is exhausted, as user to make room before trying to continue. By default, when memory is exhausted dar aborts. -; <num> Defines the minimum number of digits to use for archive slice numbers. See the same option in dar man page for more details. EXIT CODES
dar_slaves exists with the same codes as dar does, see dar(1) man page. SIGNALS
Any signal sent to dar_slave will abort the program immediately, there is no way to have a proper termination before the end of the process SEE ALSO
dar(1), dar_xform(1), dar_manager(1), dar_cp(1) KNOWN BUGS
None actually. AUTHOR
http://dar.linux.free.fr/ Denis Corbin France Europe 3rd Berkeley Distribution March 3rd, 2012 DAR_SLAVE(1)
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