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List: toasters
Subject: Re: Maximum Total End-to-End Distance for SAS Copper?
From: Philbert Rupkins <philbertrupkins () gmail ! com>
Date: 2014-12-02 17:18:57
Message-ID: CAFXFsqQ=KRqgxRMr9Zdor=1sxqrwuhrEtuWSyF9Tkn+ULem1jg () mail ! gmail ! com
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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
> >>
> >>
> >>
> >> _______________________________________________
> >> Toasters mailing list
> >> Toasters@teaparty.net
> >> http://www.teaparty.net/mailman/listinfo/toasters
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Toasters mailing list
> >> Toasters@teaparty.net
> >> http://www.teaparty.net/mailman/listinfo/toasters
> >>
> >
> >
> > _______________________________________________
> > Toasters mailing list
> > Toasters@teaparty.net
> > http://www.teaparty.net/mailman/listinfo/toasters
> >
>
> _______________________________________________
> Toasters mailing list
> Toasters@teaparty.net
> http://www.teaparty.net/mailman/listinfo/toasters
>
[Attachment #5 (text/html)]
<div dir="ltr">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).<div><br>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.</div><div><div><br></div></div><div class="gmail_extra"><br><div \
class="gmail_quote">On Tue, Dec 2, 2014 at 2:27 AM, Borzenkov, Andrei <span \
dir="ltr"><<a href="mailto:andrei.borzenkov@ts.fujitsu.com" \
target="_blank">andrei.borzenkov@ts.fujitsu.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">X66007A-R6 - Cable,SAS,Cntlr-Shelf/Shelf-Shelf,QSFP,50m \
(straight from HWU)<br> <div class="HOEnZb"><div class="h5"><br>
-----Original Message-----<br>
From: <a href="mailto:toasters-bounces@teaparty.net">toasters-bounces@teaparty.net</a> \
[mailto:<a href="mailto:toasters-bounces@teaparty.net">toasters-bounces@teaparty.net</a>] \
On Behalf Of Momonth<br>
Sent: Tuesday, December 02, 2014 11:08 AM<br>
To: Philbert Rupkins<br>
Cc: <a href="mailto:toasters@teaparty.net">toasters@teaparty.net</a><br>
Subject: Re: Maximum Total End-to-End Distance for SAS Copper?<br>
<br>
I think the longest SAS cable is 30m, i've seen that on HWU when I investigated \
this topic.<br> <br>
Vladimir<br>
<br>
On Mon, Dec 1, 2014 at 6:56 PM, Philbert Rupkins <<a \
href="mailto:philbertrupkins@gmail.com">philbertrupkins@gmail.com</a>> wrote:<br> \
> It is a FAS3240 running ONTAP 8.1.3 - 7-Mode. All DS4243 shelves in the<br> \
> stack.<br> ><br>
> Are those end-to-end maximums (controller to last shelf in stack)<br>
> you're listing or point-to-point (controller-to-first-shelf and/or \
shelf-to-shelf)?<br> > We're in trouble if 10m is the end-to-end maximum.<br>
><br>
> I checked HWU and didnt find anything information regarding end-to-end<br>
> maximums.<br>
><br>
><br>
><br>
> On Mon, Dec 1, 2014 at 10:57 AM, isaac.gonzalez<br>
> <<a href="mailto:isaac.gonzalez@claranet.es">isaac.gonzalez@claranet.es</a>><br>
> wrote:<br>
>><br>
>> 10 - 20 m copper<br>
>> 30 - 50 m optical<br>
>> It depends on the controller and the OnTap version.<br>
>> You can have a look in Netapp Hardware Universe.<br>
>><br>
>> Isaac<br>
>><br>
>><br>
>><br>
>> On 01/12/14 17:49, Philbert Rupkins wrote:<br>
>><br>
>> Hello,<br>
>><br>
>> Does anybody know if there is a maximum end-to-end/point-to-point<br>
>> distance for SAS copper cables in a stack?<br>
>><br>
>><br>
>> The Universal SAS Cabling Guide provides the following maximum<br>
>> distances for SAS optical but makes no mention of a maximum distance for SAS \
copper.<br> >><br>
>> If you are using SAS optical multimode breakout cables, the following<br>
>> parameters apply:<br>
>><br>
>> • The point-to-point (QSFP-to-QSFP) path of any multimode cable<br>
>> cannot exceed 150 meters for OM4 and 100 meters for OM3.<br>
>><br>
>> • The total end-to-end path (sum of point-to-point paths from the<br>
>> controller to the last shelf) cannot exceed 510 meters.<br>
>><br>
>> Just wondering if there is also a maximum for SAS copper.<br>
>><br>
>> Thanks,<br>
>> Phil<br>
>><br>
>><br>
>><br>
>> _______________________________________________<br>
>> Toasters mailing list<br>
>> <a href="mailto:Toasters@teaparty.net">Toasters@teaparty.net</a><br>
>> <a href="http://www.teaparty.net/mailman/listinfo/toasters" \
target="_blank">http://www.teaparty.net/mailman/listinfo/toasters</a><br> \
>><br> >><br>
>><br>
>><br>
>> _______________________________________________<br>
>> Toasters mailing list<br>
>> <a href="mailto:Toasters@teaparty.net">Toasters@teaparty.net</a><br>
>> <a href="http://www.teaparty.net/mailman/listinfo/toasters" \
target="_blank">http://www.teaparty.net/mailman/listinfo/toasters</a><br> \
>><br> ><br>
><br>
> _______________________________________________<br>
> Toasters mailing list<br>
> <a href="mailto:Toasters@teaparty.net">Toasters@teaparty.net</a><br>
> <a href="http://www.teaparty.net/mailman/listinfo/toasters" \
target="_blank">http://www.teaparty.net/mailman/listinfo/toasters</a><br> ><br>
<br>
_______________________________________________<br>
Toasters mailing list<br>
<a href="mailto:Toasters@teaparty.net">Toasters@teaparty.net</a><br>
<a href="http://www.teaparty.net/mailman/listinfo/toasters" \
target="_blank">http://www.teaparty.net/mailman/listinfo/toasters</a><br> \
</div></div></blockquote></div><br></div></div>
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