Re: RDAC Configuration Question

From: Hans-Dieter Kutz (hdkutz_at_HDKUTZ.DE)
Date: 02/24/05

  • Next message: Jason delaFuente: "Re: RDAC Configuration Question" 
    Date:         Thu, 24 Feb 2005 18:10:27 +0100
To: aix-l@Princeton.EDU

    On Thu, Feb 24, 2005 at 07:46:34AM -0900, Mike Tibor wrote:
    > 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
    Nope!
    That wouldn't do the task.
    You had to remove your complete Fiber-Environment with:
    <snip>
    for i in `lsdev -Cc disk|grep Array|awk '{print $1'}`
    do
            rmdev -dl $i
    done
    rmdev -dl dar0
    rmdev -dl dar1
    rmdev -dl dac0
    rmdev -dl dac1
    rmdev -dl fcnet0
    rmdev -dl fcnet1
    rmdev -Rdl fcs0
    rmdev -Rdl fcs1
    <snip>

    Then run cfgmgr -v .
    Your disks will then be available.
    fget_config -Av
    will show your Environment after the change.
    That's Fastt!
    Cheers,
    ku

    >
    > 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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