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effect of change of mpd preferred path settings


 
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Operating Systems Solaris effect of change of mpd preferred path settings
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Old 07-23-2009
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?

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