jeff.cleverley at avagotech
May 8, 2012, 8:45 AM
Post #3 of 3
Is this really a problem even in the multi-path HA cabling
configuration? I know I've done this with FC ports on multiple
occasions. We've had the optics fail on both onboard ports and HBAs.
Instead of leaving them with a single path while we waited for parts
and a maintenance window, we just plugged them into a spare port.
Everything failed over just fine. Once we got the parts replaced, we
put the cable back and everything was happy.
If worst comes to worst I'll do a non-symmetric cabling configuration
and clean it up whenever we get a downtime window.
On Mon, May 7, 2012 at 4:59 PM, Gelb, Scott
<sgelb [at] insightinvestments> wrote:
> Changing source ports (SAS or FC initiators) without taking the node
> down is dangerous and can cause a system panic and WAFL inconsistency
> (then downtime to wafliron/wafl_check). During a flush to disk there
> may not be enough time to update the disk identity which has the port in
> use... if you get lucky and catch it between CPs it works.
> The supported method is to take the node down to maintenance
> mode...recable, then check connections (sasadmin expander_map, sasadmin
> shelf, storage show disk -p, etc.). You can do this with a cf takeover
> then boot the down node to maintenance mode, confirm all is working,
> then reboot and cf giveback.
> Since there may some issues after moving ports around outside of
> maintenance mode with the node serving data, I would open a case and
> confirm next steps... likely will be to recable in maintenance mode.
> -----Original Message-----
> From: toasters-bounces [at] teaparty
> [mailto:toasters-bounces [at] teaparty] On Behalf Of Jeff Cleverley
> Sent: Monday, May 07, 2012 3:40 PM
> To: toasters [at] teaparty
> Subject: SAS port swap.
> I have a SAS stack (plus other FC ds14s) in a FAS60xx cluster running
> 188.8.131.52. It has 2 quad port SAS HBAs per filer. The stack currently
> uses ports 6a and 7d on each filer.
> I need to add a couple more stacks. To make the cabling consistent I
> would like to move the current 7d connection to port 7a. When I moved
> the cable from 7d to 7a on one of the heads, it never brought the port
> online and never saw the disks on that port. I tried the storage enable
> adapter 7a but it still showed it was offline. I ran various sysconfig,
> storage show, disk show, etc, type commands to get the system to go find
> the disks on the new path. Nothing seemed to help.
> I waited 5 minutes after doing this just in case there was some type of
> discovery lag, but they never showed up. When I plugged back into 7d,
> everything is fine.
> I thought moving to a new port should work. Is there something else I'm
> missing to make this work?
> Jeff Cleverley
> Unix Systems Administrator
> 4380 Ziegler Road
> Fort Collins, Colorado 80525
> Toasters mailing list
> Toasters [at] teaparty
Unix Systems Administrator
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