Mailing List Archive: Netapp: toasters

Wiring question

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peta.spies at gmail

Dec 4, 2008, 4:50 AM

Post #1 of 3 (1379 views)
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Wiring question

Hi all,

Thanks for your responses to my earlier question about swapping small
disks for larger ones. Looks like we're going to have to get the mice
in the comms room to pedal faster...

Anyway, another query entirely. I've just found that one of my
netapps is really poorly wired - it's a 3040C with two SATA shelves on
one loop, and most of the wiring has IN and OUT ports swapped from the
way it should be, aside from one example where it's the right way
around. The netapp head can see the shelves though, so it's clearly
not too much of a problem.

I now want to add two more shelves to the loop. Is it worth recabling
the whole thing so it's done correctly, bearing in mind that vol0
lives on the affected SATA shelves and there is production stuff on
the other loop (FCAL shelves), I'm guessing the filer won't like it if
vol0 goes away? Someone here suggested that the incorrect wiring may
be affecting performance. Or does it make no difference and I can
just add the new shelves with the wiring inthe same backwards manner?

Peta

bacardicoke at gmail

Dec 4, 2008, 6:40 AM

Post #2 of 3 (1250 views)
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Re: Wiring question [In reply to]

Hey Peta,

On Thu, Dec 4, 2008 at 1:50 PM, Peta Spies <peta.spies [at] gmail> wrote:
>
> I now want to add two more shelves to the loop. Is it worth recabling
> the whole thing so it's done correctly, bearing in mind that vol0
> lives on the affected SATA shelves and there is production stuff on
> the other loop (FCAL shelves), I'm guessing the filer won't like it if
> vol0 goes away? Someone here suggested that the incorrect wiring may
> be affecting performance. Or does it make no difference and I can
> just add the new shelves with the wiring inthe same backwards manner?

I don't have any experience on the incorrect wiring, I tend to wire
NetApp's correctly :-)

When you should decide to recable, bear in mind that:

1) Any loss of connectivity with 2 or more disks without the
possibility to use spares to rebuild, will result in a Multiple Disks
Missing PANIC.
2) You will most likely have to reboot when you are done for the filer
to map ESH, shelf and disks correctly, so why not power down, recable
and power up again?

Greets,

Nils

--
Simple guidelines to happiness:
Work like you don't need the money,
Love like your heart has never been broken and
Dance like no one can see you.

Dennis.Go at netapp

Dec 4, 2008, 6:58 AM

Post #3 of 3 (1243 views)
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RE: Wiring question [In reply to]

Hello,

Can anyone tell me how I can remove myself from the toasters mailing
list?

Thanks,
Dennis

-----Original Message-----
From: Peta Spies [mailto:peta.spies [at] gmail]
Sent: Thursday, December 04, 2008 7:51 AM
To: toasters [at] mathworks
Subject: Wiring question

Hi all,

Thanks for your responses to my earlier question about swapping small
disks for larger ones. Looks like we're going to have to get the mice
in the comms room to pedal faster...

Anyway, another query entirely. I've just found that one of my netapps
is really poorly wired - it's a 3040C with two SATA shelves on one loop,
and most of the wiring has IN and OUT ports swapped from the way it
should be, aside from one example where it's the right way around. The
netapp head can see the shelves though, so it's clearly not too much of
a problem.

I now want to add two more shelves to the loop. Is it worth recabling
the whole thing so it's done correctly, bearing in mind that vol0 lives
on the affected SATA shelves and there is production stuff on the other
loop (FCAL shelves), I'm guessing the filer won't like it if vol0 goes
away? Someone here suggested that the incorrect wiring may be affecting
performance. Or does it make no difference and I can just add the new
shelves with the wiring inthe same backwards manner?

Peta

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