Hi Steve,
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 console message 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 30 seconds 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 serving the data on that shelf, it will panic.
Best regards, Filip
On 4/24/12, Jeff Cleverley jeff.cleverley@avagotech.com wrote:
Steve,
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.
Jeff
On Tue, Apr 24, 2012 at 9:58 AM, Stephen Stocke stephen.stocke@iconsultci.com 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 is:
CNTRL-A/0a -> AT-FCX-A -> CNTRL-A/0b And 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?
Thanks Steve
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