effect of change of mpd preferred path settings Post: 302336961

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Operating Systems Solaris effect of change of mpd preferred path settings Post 302336961 by sundar3350 on Thursday 23rd of July 2009 07:25:20 AM

07-23-2009

Registered User

effect of change of mpd preferred path settings

Hello All,

In the output of the command "mpdcontrol -no xlist", I found that, some of the preferred paths are marked as "err". You can see the output below:

Code:

# mpdcontrol -noxlist
Unit Dev# MPD_ID/Policy   DeviceName      FC_AL DevMajMin IOcnt State
==============================================================
   0    0 mpd0            c16t0d0             - 32,1920   10150 opn enb prf
        1 prefer          c18t0d0             - 32,2160       0 opn enb
--------------------------------------------------------------------------------
   1    0 mpd1            c16t0d1             - 32,2400     424 opn enb
        1 prefer          c18t0d1             - 32,3072   51714 opn enb prf
--------------------------------------------------------------------------------
   2    0 mpd2            c16t0d2             - 32,2408    1888 opn enb prf
        1 prefer          c18t0d2             - 32,3080       0 opn enb
--------------------------------------------------------------------------------
   3    0 mpd3            c16t0d3             - 32,2416     247 opn enb
        1 prefer          c18t0d3             - 32,3088   29714 opn enb prf
--------------------------------------------------------------------------------
   4    0 mpd4            c16t0d10            - 32,2472   44936 opn enb prf
        1 prefer          c18t0d10            - 32,3144       0 opn enb
--------------------------------------------------------------------------------
   5    0 mpd5            c17t1d0             - 32,2048      56 err
        1 prefer          c19t1d0             - 32,2288   87250 opn enb prf
--------------------------------------------------------------------------------
   6    0 mpd6            c17t1d1             - 32,2904   41400 err prf
        1 prefer          c19t1d1             - 32,3576   11942 opn enb
--------------------------------------------------------------------------------
   7    0 mpd7            c17t1d2             - 32,2912      56 err
        1 prefer          c19t1d2             - 32,3584    1832 opn enb prf
--------------------------------------------------------------------------------
   8    0 mpd8            c17t1d3             - 32,2920   29409 err prf
        1 prefer          c19t1d3             - 32,3592   68081 opn enb
--------------------------------------------------------------------------------
   9    0 mpd9            c17t1d10            - 32,2976     295 err
        1 prefer          c19t1d10            - 32,3648   44936 opn enb prf
--------------------------------------------------------------------------------

In this output we can see that some of the preferred paths were set to "err". So, those preferred paths were later changed to point to the normal disks.

Will changing of these settings result in any slowdown of the system?

sundar3350

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set_cdscp_preferred_clearinghouse

set cdscp preferred clearinghouse(1m)									     set cdscp preferred clearinghouse(1m)

NAME

       set  cdscp  preferred  clearinghouse - Specifies a preferred clearinghouse to use for satisfying read requests that result from CDS control
       program commands

SYNOPSIS

       cdscp set cdscp preferred clearinghouse [clearinghouse-name]

ARGUMENTS

       The full name of the preferred clearinghouse.  If you omit this argument, the command causes CDS to revert to the default, which is to  use
       any clearinghouse.

DESCRIPTION

       The  set cdscp preferred clearinghouse command specifies a preferred clearinghouse to use for satisfying read requests that result from CDS
       control program commands.  You cannot specify a preferred clearinghouse for making modifications, because these	requests  always  use  the
       master  replica.   You  must  use  this command within the CDS control program.	Exiting from the CDS control program removes the preferred
       clearinghouse setting.  You must reset the preferred clearinghouse each time you enter the CDS control program.

   Permissions Required
       None

NOTE

       This command is replaced at Revision 1.1 by the dcecp command and may not be provided in future releases of DCE.

EXAMPLE

       The following command specifies /.:/Paris_CH as the preferred clearinghouse: $ cdscp cdscp> set cdscp preferred clearinghouse /.:/Paris_CH

RELATED INFORMATION

       Command: show cdscp preferred clearinghouse(1m)

													     set cdscp preferred clearinghouse(1m)