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  • 1.  /dev/dac01 device

    Posted Wed September 09, 2009 08:40 AM

    Originally posted by: SystemAdmin


    Hi,

    I see /dev/dac0, /dev/dac1 devices on my AIX system.

    what are these devices?

    Does these devices appear only with DS arrays attached ?

    Thanks !
    #AIX-Forum


  • 2.  Re: /dev/dac01 device

    Posted Wed September 09, 2009 09:40 AM

    Originally posted by: jvk


    They represent two DS controllers when using RDAC. You'll see also a dar device which represents your DS box and sure it contains both dacs if all is fine. Something like this:

    lsattr -El dar0
    act_controller dac0,dac1 Active Controllers
    all_controller dac0,dac1 Available Controllers

    Forget dars and dacs with MPIO.
    #AIX-Forum


  • 3.  Re: /dev/dac01 device

    Posted Wed September 09, 2009 09:56 AM

    Originally posted by: jvk


    Need to correct myself that instead of DS I should use DS4k. dacs/dars are not present when using DS5k, DS6k, DS8k and other storage boxes.
    #AIX-Forum


  • 4.  Re: /dev/dac01 device

    Posted Wed September 09, 2009 09:43 AM

    Originally posted by: SystemAdmin


    Yes these appear if you have SAN/DS4k/FASt storage connected to the AIX box.

    r/
    R
    #AIX-Forum


  • 5.  Re: /dev/dac01 device

    Posted Wed September 09, 2009 03:02 PM

    Originally posted by: SystemAdmin


    Thank you, this helps.

    Will all the AIX hosts which has inband FC LUNs from DS4K will have these /dev/dac devices?

    Are there any known issues if I open this device and issue any commands?

    One of the utilities which issues IOCTL interfaces opened this device and invoked IOCTLs which caused my production host to hang.
    #AIX-Forum


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