filip.sneppe at gmail
Apr 24, 2012, 1:39 PM
Post #3 of 3
Yes this type of recabling should work without any problems provided you always
leave one path for each controller to the shelves. Prepare to get a
about the failed redundancy when you pull one cable. This may also trigger
an ASUP depending on how the relevant option is set.
Hint: use the "storage show disk -p" command to check your multipathing
before, during and after your changes. You should give the filer about
after a change before it will typically start to use newly added paths.
The problem with your current cabling setup is that, while it is technically
a redundant cabling solution, a failure of one of your shelf modules will result
in one controller being unable to see the shelf. If this controller is
data on that shelf, it will panic.
On 4/24/12, Jeff Cleverley <jeff.cleverley [at] avagotech> wrote:
> I don't have a 2020 and don't know if it has any special quirks, but
> swapping your B cables live should not be an issue. Both heads will
> still have access to the shelf via the A ports. I've done this type
> of swap on 6000 series boxes on several occasions when I've had
> cabling issues.
> On Tue, Apr 24, 2012 at 9:58 AM, Stephen Stocke
> <stephen.stocke [at] iconsultci> wrote:
>> Hello Toasters
>> I have a FAS2020 Active/Active system with one DS14MK2-AT shelf attached.
>> This weekend I intend to hot-add an additional DS14MK2-AT shelf. However,
>> I believe the existing loop is cabled incorrectly. I'm hoping someone on
>> this list can give me some pointers to confirm whether the cabling can be
>> corrected without taking the filers offline. I really want to fix the
>> cabling before I attempt to hot-add the new shelf. The current cabling
>> CNTRL-A/0a -> AT-FCX-A -> CNTRL-A/0b
>> CNTRL-B/0a -> AT-FCX-B -> CNTRL-B/0b
>> According to the FAS2020 installation flyer, the end of each loop path
>> should terminate with the opposite controller's 0b port (not the same
>> controller as above). Is it possible/advisable to disconnect the cable
>> from both controllers' 0b port and swap them over to get to the correct
>> setup? So long as I don't lose one of the AT-FCX modules during the
>> switchover it seems like it would be okay.
>> I'm going to open a case with support but I was hoping some of the experts
>> on this list might have some thoughts/recommendations/horror stories you
>> can share?
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> Jeff Cleverley
> Unix Systems Administrator
> 4380 Ziegler Road
> Fort Collins, Colorado 80525
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