Arista DCS-7050TX-64-F - eBay US

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NablaSquaredG

Destroyer of Mellanox switches
Aug 17, 2020
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That is a pretty funny comment because anyone installing a rack of regular Front-of-Rack to Rear-of-Rack (cold isle to hot isle) servers will look at F-to-R as a data center standard for edge infrastructure. For example:
You guys have weird datacenters. In all datacenters I've been, the switches were mounted on the backside. In the picture you're showing there's a huge open gap between the switches, making it unsuitable for cold-aisle hot-aisle operation
 
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ano

Well-Known Member
Nov 7, 2022
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we have 0 gaps between switches, and run R mount with R airflow, both on "everything cooled" DC and hot/cold isle.

Switches are deep enough not to need trays usually, some arista needs them "needs".

damn I hate the people running reverse mount, but F flow switches pulling hot air into cold isle, its a huuuuuge problem.
 
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NablaSquaredG

Destroyer of Mellanox switches
Aug 17, 2020
1,434
878
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we have 0 gaps between switches, and run R mount with R airflow, both on "everything cooled" DC and hot/cold isle.
1701948408006.png

You somehow need to seal where you run cables from back to front

damn I hate the people running reverse mount, but F flow switches pulling hot air into cold isle, its a huuuuuge problem.
Yeah that's dumb. Don't do that in hot/cold aisle topologies...
 
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nickwalt

Member
Oct 4, 2023
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Brisbane
That particular data center didn't have cold or hot isle containment and sealing every gap was not standard practice. However, ensuring front-to-rear airflow was enforced and luckily most of our access switches exhausted through the switchports. Interestingly, the Juniper and Cisco switches were the models that most often shipped with what I called a non-data center SKUs and exhausted out the PSU end. The Celestica switches in the image were all correct for data center edge installations.
 

Fritz

Well-Known Member
Apr 6, 2015
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Can the fans in this Arista switch be physically turned around to blow out the back?
 

ano

Well-Known Member
Nov 7, 2022
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ohh you mean with screwdriver and just popping them out? hmm interesting, never htought about it, but yes then you can probably do it , sorry about that!


arista has a model where you can flip it without tools hence my comment
 
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PnoT

Active Member
Mar 1, 2015
650
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You guys are killing me... I want to buy one so bad but know damn well they're not going to be quiet enough =/
 

ano

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Nov 7, 2022
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buddy has one and runs it no cover with a huge deskfan at slow speed :D
 

PnoT

Active Member
Mar 1, 2015
650
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Texas
buddy has one and runs it no cover with a huge deskfan at slow speed :D
LOL, I would love to see a pic of that! I have an ICX 7250-24P and 48P, both with modded fans, and they're pretty quiet, but taming something this large seems like a challenge. so on the fence right now...
 

Fritz

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Apr 6, 2015
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It's not really that loud. I was surprised at how quiet it was. I was expecting it to be much louder.

I pulled one of the fans out and it does look they can be reversed quite easily.

IMG_3014.jpg
 

Fritz

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Apr 6, 2015
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The power supplies are directional and have fans too, if you flip the fan units around, you'll have to flip the fan direction inside the PSUs as well, or it will just circulate its own hot air in a big circle
Thanks. Didn't think of that.
 

pmichel

New Member
Sep 15, 2022
4
3
3
In the past two weeks, I've fan-modded a few of these switches. The actual fans themselves are quiet when run at 30% max speed, but the PSU fans have an annoying whine to them.

I used Noctua NF-A20s in the power supplies as well as some 40x40x28mm quiet fans I had around and in both cases the switches get very acceptable for homelab use. The Noctua's raise the PSU temps by ~5C or so, but keep everything well within reasonable ranges.

Plenty of info on reddit, such as in this post.
 

Fritz

Well-Known Member
Apr 6, 2015
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I made an offer and they don't seem motivated enough at the moment =)
Looking at the seller's other offerings it's clear to see he specializes in switches and related gear. He probably knows his market, knows when to hold them and knows when to fold them.
 

Fritz

Well-Known Member
Apr 6, 2015
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I deal directly with Dedicated networks and for work I order about a pallet a month of cisco and arista switches. They amazing vendor to deal with.
yea, my switch was professionally packed and in pristine condition. They even reset it to factory defaults which is a nice touch.
 
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PnoT

Active Member
Mar 1, 2015
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I've switched out all 4 of my regular fans for the Noctua NF-A4x20-PWM, and so far, things are good.

Code:
System temperature status is: Ok
                                                                Alert   Critical
Sensor  Description                            Temperature  Threshold  Threshold
------- ------------------------------------ ------------- ---------- ----------
1       Cpu temp sensor                            47.203C        90C        95C
2       CPU board temp sensor                      29.000C        75C        80C
3       Back-panel temp sensor                     27.000C        75C        85C
4       Board sensor                               42.000C        55C        80C
5       Front-panel temp sensor                    34.000C        55C        65C
6       Trident Bottom Right Outer                 66.661C       100C       110C
7       Trident Bottom Left Outer                  69.373C       100C       110C
8       Trident Top Left Outer                     68.830C       100C       110C
9       Trident Top Right Outer                    65.034C       100C       110C
10      Trident Bottom Right Inner                 67.203C       100C       110C
11      Trident Bottom Left Inner                  67.746C       100C       110C
12      Trident Top Left Inner                     67.746C       100C       110C
13      Trident Top Right Inner                    67.203C       100C       110C

PowerSupply 1:
                                                                Alert   Critical
Sensor  Description                            Temperature  Threshold  Threshold
------- ------------------------------------ ------------- ---------- ----------
1       Hotspot temperature sensor                 35.000C        95C       100C
2       Inlet temperature sensor                   33.000C        70C        75C

PowerSupply 2:
                                                                Alert   Critical
Sensor  Description                            Temperature  Threshold  Threshold
------- ------------------------------------ ------------- ---------- ----------
1       Hotspot temperature sensor                 33.000C        95C       100C
2       Inlet temperature sensor                   25.000C        70C        75C

System cooling status is: Ok
Ambient temperature: 27C
Fan speed override mode enabled at 30%
Airflow: back-to-front
Fan              Status          Configured Speed     Actual Speed
---------------- --------------- ---------------- ----------------
1/1              Ok                           30%              29%
2/1              Ok                           30%              30%
3/1              Ok                           30%              29%
4/1              Ok                           30%              29%
PowerSupply1/1   Ok                           30%              33%
PowerSupply2/1   Ok                           30%              33%

Power                                  Input    Output   Output
Supply  Model                Capacity  Current  Current  Power    Status
------- -------------------- --------- -------- -------- -------- -------------
1       PWR-500AC-R               500W    0.58A    4.75A    55.6W Ok
2       PWR-500AC-R               500W    0.84A    7.05A    80.6W Ok
Total   --                       1000W       --       --   136.2W --
I will mod the PSU fans with two more Noctua later this afternoon, but this switch is nice.

It's in mint condition and has a set of new rails. There's nothing to complain about here.