Re: RDAC Configuration Question

From: Jason delaFuente (jason.delafuente_at_GBE.COM)
Date: 02/24/05

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    Date:         Thu, 24 Feb 2005 11:12:24 -0600
To: aix-l@Princeton.EDU

    Correct, you should only have one dar0. If the system configured itself
    with 2 dars when cfgmgr was run then there is probably some underlying
    issue that needs to be addressed.

    We ran into the same thing, 2 dars, a while back. In our case the
    system was seeing to many ports (zoning issue) on the fastt and in
    another case we had some old sdd software that was causing an issue.

    Jason de la Fuente

    >>> tibor@TIBOR.ORG 02/24/05 10:46AM >>>
    I've got a 570 running AIX 5.3 with two fibre HBAs connected to a
    Fastt700. I've got a volume group with two raid 5 arrays that I'm
    striping over, with each array having a different controller
    preference.
    However, it doesn't look like it's configured right to me with respect
    to
    the dar devices.

    I've got dar0 and dar1; each is configured to have only one active
    controller--dar0 has dac0, and dar1 has dac1:

    root@aixdb2-2:~# lsattr -El dar0
    act_controller dac0 Active Controllers False
    aen_freq 600 Polled AEN frequency in seconds True
    all_controller dac0 Available Controllers False
    autorecovery no Autorecover after failure is corrected True
    balance_freq 600 Dynamic Load Balancing frequency in seconds True
    cache_size 0 Cache size for both controllers False
    fast_write_ok no Fast Write available False
    held_in_reset none Held-in-reset controller True
    hlthchk_freq 600 Health check frequency in seconds True
    load_balancing no Dynamic Load Balancing True
    switch_retries 5 Number of times to retry failed switches True

    I spent some time doing Google searches, and from what I've seen I need
    to
    have a single dar0 configured with both dac0 and dac1 as active
    controllers in order to have redundancy between controllers (ie, that
    should allow me to pull one fibre cable without any problems). Is
    this
    correct?

    To fix this, I'm guessing I need to do something like the following:

    chdev -l dar1 -a act_controller=""
    chdev -l dar0 -a act_controller="dac0,dac1"
    rmdev -d -l dar1

    Is that about right? If so, can I do it while the volume group on the
    SAN
    is active, or should I unmount everything there and varyoff the volume
    group?

    Thanks,
    Mike

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