Thanks everybody.  I was wondering if there is a maximum end-to-end (controller to last shelf in stack) distance that applies to a stack built w/all copper cables.  For example, a stack consisting of 6 shelves connected with 5 meter cables would have an end-to-end distance of 30 meters.   I was curious because the Universal SAS Cabling Guide lists the maximum end-to-end distances for optical cables (not for copper).

We currently have a total of 12m of passive SAS copper between our controller and the last shelf in the stack.   While I'm still not sure if there is an end-to-end maximum that applies to passive copper, I think we are in good shape given there are passive copper cable lengths of up to 5 meters.


On Tue, Dec 2, 2014 at 2:27 AM, Borzenkov, Andrei <andrei.borzenkov@ts.fujitsu.com> wrote:
X66007A-R6 - Cable,SAS,Cntlr-Shelf/Shelf-Shelf,QSFP,50m (straight from HWU)

-----Original Message-----
From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Momonth
Sent: Tuesday, December 02, 2014 11:08 AM
To: Philbert Rupkins
Cc: toasters@teaparty.net
Subject: Re: Maximum Total End-to-End Distance for SAS Copper?

I think the longest SAS cable is 30m, i've seen that on HWU when I investigated this topic.

Vladimir

On Mon, Dec 1, 2014 at 6:56 PM, Philbert Rupkins <philbertrupkins@gmail.com> wrote:
> It is a FAS3240 running ONTAP 8.1.3 - 7-Mode.   All DS4243 shelves in the
> stack.
>
> Are those end-to-end maximums (controller to last shelf in stack)
> you're listing or point-to-point (controller-to-first-shelf and/or shelf-to-shelf)?
> We're in trouble if 10m is the end-to-end maximum.
>
> I checked HWU and didnt find anything information regarding end-to-end
> maximums.
>
>
>
> On Mon, Dec 1, 2014 at 10:57 AM, isaac.gonzalez
> <isaac.gonzalez@claranet.es>
> wrote:
>>
>> 10 - 20 m copper
>> 30 - 50 m optical
>> It depends on the controller and the OnTap version.
>> You can have a look in Netapp Hardware Universe.
>>
>> Isaac
>>
>>
>>
>> On 01/12/14 17:49, Philbert Rupkins wrote:
>>
>> Hello,
>>
>> Does anybody know if there is a maximum end-to-end/point-to-point
>> distance for SAS copper cables in a stack?
>>
>>
>> The Universal SAS Cabling Guide provides the following maximum
>> distances for SAS optical but makes no mention of a maximum distance for SAS copper.
>>
>> If you are using SAS optical multimode breakout cables, the following
>> parameters apply:
>>
>> • The point-to-point (QSFP-to-QSFP) path of any multimode cable
>> cannot exceed 150 meters for OM4 and 100 meters for OM3.
>>
>> • The total end-to-end path (sum of point-to-point paths from the
>> controller to the last shelf) cannot exceed 510 meters.
>>
>> Just wondering if there is also a maximum for SAS copper.
>>
>> Thanks,
>> Phil
>>
>>
>>
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