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CPU usage rate of FC Switch rises with 3PAR OS 3.3.1 MU1 & FC Switch (FOS v7.4.2a)

  • 1.  CPU usage rate of FC Switch rises with 3PAR OS 3.3.1 MU1 & FC Switch (FOS v7.4.2a)

    Posted 01-19-2018 01:24 AM

    I am using HPE 3PAR (3.3.1 MU1) and Brocade 6510 (FOS v7.4.2a).
    If you connect 3PAR to 6510, login to the switch and check with the top command, you can see that the CPU utilization of 6510 is rising.

    ------------------------------------------------------------------------
    top - 15:17:30 up 57 days,  3:12,  1 user,  load average: 1.59, 1.16, 0.95
    Tasks:  84 total,   3 running,  81 sleeping,   0 stopped,   0 zombie
    Cpu(s): 30.7%us, 31.1%sy,  0.0%ni, 17.1%id,  0.0%wa,  3.7%hi, 17.4%si,  0.0%st
    Mem:   1024012k total,   608512k used,   415500k free,    28492k buffers
    Swap:        0k total,        0k used,        0k free,   337876k cached

      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
     1215 0         15   0  119m 8976 6292 S 62.5  0.9   7144:23 msd0
     1208 0          6 -10  104m  10m 8040 S 11.4  1.1   1713:20 fabricd0
     1203 0         16   0  125m  15m 7068 S  3.3  1.5 422:01.54 mdd0
    24639 6000      16   0  2816 1300 1040 R  2.6  0.1   0:06.21 top
     1251 0         16   0 88432 8452 5168 S  1.3  0.8 143:56.06 trafd0
        2 0         34  19     0    0    0 R  0.3  0.0  14:30.33 ksoftirqd/0
     1118 0         16   0  113m 8064 5852 S  0.3  0.8  31:20.68 emd0
     1209 0         16   0 89492 8020 5168 S  0.3  0.8  12:44.80 fcpd0
    22920 0         16   0 39964 6804 5660 S  0.3  0.7   0:15.93 sshd
        1 0         16   0  1696  592  524 S  0.0  0.1   0:05.90 init
    ------------------------------------------------------------------------

    Every few minutes the CPU usage of the msd0 process rise by several tens of seconds and then settling down.

    By the way, disconnecting 3PAR and Brocade 6510 reduce CPU usage.


    Is there a way to solve this situation?

    Thank you

     


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  • 2.  Re: CPU usage rate of FC Switch rises with 3PAR OS 3.3.1 MU1 & FC Switch (FOS v7.4.2a)

    Posted 01-22-2018 08:50 AM
    From what I know, 3par arrays can do quite a number of interesting things in SAN, including NPIV for a seamless port-to-port failover and Target Driven Zones. I think these features might require interaction with msd and therefore the array controllers periodically poll the switches to discover any possible changes. If you don't use any of these features, you might need to ask your HPE support guys if it is possible to turn off the polling.
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