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  • Front to Back TOR Switches

    Out of interest what are people doing with Front -> Back TOR Switches in a Hot/Cold Aisle DC? Do you just install as normal or are people using sleeve's or (Insert other solution here)?
    James Chillman

  • #2
    Cable wise always found putting them at the back easier for cables and avoids loosing a U to pass the cables through
    Simon Gunton
    The views expressed in the above post are mine alone and not necessarily those of anyone else

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    • #3
      Originally posted by SimonGtn View Post
      Cable wise always found putting them at the back easier for cables and avoids loosing a U to pass the cables through
      That's kind of James' point - a front to back cooled switch mounted in reverse in a rack is drawing in air from the hot aisle and exhausting it into he cold aisle!
      GoDaddy are abusing WHC with shill advertising

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      • #4
        Originally posted by Ed-Freethought View Post
        That's kind of James' point - a front to back cooled switch mounted in reverse in a rack is drawing in air from the hot aisle and exhausting it into he cold aisle!
        So buy a back to front cooled model instead? .
        Chris Burton Astutium Ltd AS29527 Company#08183381 VAT#GB-145054825
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        • #5
          Originally posted by BurtyB View Post
          So buy a back to front cooled model instead? .
          I prefer side-to-side - then you screw up all the airflow!
          GoDaddy are abusing WHC with shill advertising

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          • #6
            Originally posted by BurtyB View Post
            So buy a back to front cooled model instead? .
            Not all models of kit are made With a Back to front option unfortunatly!
            James Chillman

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            • #7
              Most TOR switches are only ear mount and half depth at most and side to side and so doesn't matter if mounted back to front or front to back
              Simon Gunton
              The views expressed in the above post are mine alone and not necessarily those of anyone else

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              • #8
                Originally posted by SimonGtn View Post
                Cable wise always found putting them at the back easier for cables and avoids loosing a U to pass the cables through
                If your're cabling them differently at the back than at the front, you're doing it wrong ...
                Rob Golding Astutium Ltd AS#29527 Company#08183381 Phone#020 3475 2555
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                • #9
                  Well at the front you either need to try and get the cables down the sides of the rack which in 600mm cabs is nearly impossible and so have to go through a 1u brush bar etc
                  Simon Gunton
                  The views expressed in the above post are mine alone and not necessarily those of anyone else

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                  • #10
                    If you're not doing it the same front & rear, you're doing it wrong on one of them ...
                    Rob Golding Astutium Ltd AS#29527 Company#08183381 Phone#020 3475 2555
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                    • #11
                      We mount switches at the back - after all that's where the server Ethernet ports are?

                      If the fans are to be an issue we just pop the lid and reverse them. Job done. In a CACS install you'll have the switch just circulating the hot aisle air, which isn't an issue anyway as most switches are happy to tolerate modest temperatures. You just have to keep a close eye on things, which you should be doing anyway in the DC.
                      Jonathan Halewood

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                      • #12
                        Interesting approach (not seen that trick used switches before)

                        But then aren't you sucking from the servers exhaust?

                        In truth, the switches are probably more tolerant of the heat than a server case as they're a fixed design.

                        The hottest hot aisle I've experienced was touching on 42C so still within the realms of 'ok'

                        We put ours at the front, but a lot (most) installations have them at the rear.
                        Gary Coates - ServerHouse Ltd
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                        • #13
                          Originally posted by VN-Jonathan View Post
                          If the fans are to be an issue we just pop the lid and reverse them. Job done.
                          I've seen this done before with Brocade Fibre Channel switches and it ended badly; the internal airflow design relied on negative pressure to pull air over some components which when the fans were reversed caused serious overheating issues!

                          Where possible we use switches with the correct direction fan trays, if not we simply mount in the front and cable front-> back.
                          Adam Gent
                          Cadence Networks Ltd - cadence.net.uk
                          Cloud Servers | Connectivity | Reliable Web Hosting

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                          • #14
                            While its far from ideal, not had any issues with C2960/G and C3560/3750G/x TOR facing the "wrong way around". That said our hot aisle is around 27 peak and certainly nothing like 42. We also have roof ran trays running too and the switch being almost touching these doesn't hurt of course.
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                            • #15
                              My original point was why are you putting them at the front of the rack anyway? As like others have said ethernet ports are at the back? Also is a massive pain when tracing cables to switch ports etc to make sure you have the right one etc
                              Simon Gunton
                              The views expressed in the above post are mine alone and not necessarily those of anyone else

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