Someone told me recently that it was better to put them first at the bottom instead of starting them from the middle for their weight.
i think what worries me is the rack slope. That why I think they were adivising to put heavy hardware at the bottom. Otherwise for now I am using Open-Frame Server Rack - 12U | Server Racks | StarTech.comf you know someone with welding gear you could strengthen up a less stable rack?
Also yes but gravity count so the less high you are the less force you will have somehow in such situation. That's probably the reasoning
i meant high in the rack the office ois in an old house at the last story there (because all wires are arial...)I better talk to the board of directors then for the company I work for. In one of our offices we have our datacentre on the 12th floor. Better convince them we need money to move the DC to the ground floor... :s
it was me in this thread, but it wasn’t about bottom or middle position, it was about: you need purchase proper rack type, then you can mount anywhere.I am curious whzere you place the rack mounted NAS on a rack, Someone told me recently that it was better to put them first at the bottom instead of starting them from the middle for their weight. It makes sense somehow but I'm curious what you are doing
Frequent mistakes, when people start considering about purchase of rack for home usage (from top to lowest):
1. Price as one and only measurement factor.
When the rack architecture, features, ... are responsible for proper operation conditions for your devices as:
a) robust for existing and planed devices (deflection)
b) sufficient internal capacity for existing and planed devices (managed/static thermal airflow)
c) side access for clean cable management or future maintenance of any devices or future airflow management upgrade
then the price must be last (important) factor. Because purchase of cheap and nice rack can be useless for proper operation of your devices, e.g. too warm operation that will decrease lifespan of entire device or parts (HDDs, CPUs, ...).
Then paper and pencil is your better friends as hurry to purchase.
You can find many of rack solutions. Some of them are usable just for light weight devices, e.g. retail router and small switch or small NAS. Then you need read carefully:
- shelf based rack for laying the devices on a shelf, when the mass is distributed trough whole shelf area (physics)
- rack mount based for light weight devices (check the rack weight capacity, but also use your brain, because the physics will catch you, or seller behavior). Specific category is two posts rack (threat to problem with them)
- rack mount based for normal operation (check the rack weight capacity)
Then any nice (design first) rack can finally throw your investment to wastebasket, because can be useless for another important features.
3. Sufficient internal capacity for existing and planed devices
Heat is you enemy. You need take into consideration that each devices has a heat beaming not just from fan side, but from top, bottom, sides, front, back (up to design of the devices), touch it and you will feel it.
Then you need sufficient air capacity for the heat flow (airflow), up to the rack construction:
- in open rack, with no AC you need count with static airflow based on your room conditions (seasonable changed, summer by sun heat, winter by kind of heating e.g.). In this kind of rack you have to count with dust. More than in others. Dust is everywhere, even when your cleaning obsession is in high level. Dust will cover not just fan, but internal area of the devices (device case), which is primary used for cooling. Then the dust decrease the heat carrying from devices, then you decrease the devices lifespan. In such kind of racks you need count with space between devices, single U is minimum.
If you have such rack in AC room, it is better, but still need to think for hours, when your AC is switched off.
- cabinet based rack, same as above (more you can find in next paragraph). If you have AC room, then the space between the devices cane be narrower or zero }up to your average temperature in the room.
frequent visual check and cleaning of dust from you devices is proper approach in this scenario.
3. Cabinet based rack
Plenty of them are available. I will just use main differences:
a) solid walls
b) mesh walls
When solid walls keeps your device covered against the dust, you need count with "blocked" airflow.
When mesh walls will provide better thermal carrying, you need count with more dust in the devices.
Glass doors is really bad idea for the thermal carrying. If you can change it to mesh doors, or purchase new custom glass with circle hole for big fans (slow rpm, better is managed rpm) do it. Don't forget for hole for fan attachment. It was my case, when custom build glass doors, then tempered for heavy resistance can help your airflow (silent managed fans from Noctua) and dust under control (dust filters). Not a huge investment, but result is perfect.
What is good idea is two fans (120mm, slow rpm, managed) inside in the cabinet (in 1/3 of height), that will give you controlled airflow to upper side of the rack, where two fans carrying heat out.
Then you need just management console with thermal sensors for right fans operation in the cabinet. My is NZXT Sentry LXE, purcahsed 5y ago, still in right operation.
Of course this setup is valid for 4 NASes, and USG Pro + Unifi 48p switch, include Fiber ONU in one of my site. I need change my exist rack next year to bigger, then I will chose Mesh walls (room is now AC).
4. Side access (or back)
This feature is frequently underestimated.
It can help you better organize your wires to maximize airflow w/o obstructions. A mess of cables is the another important objective of decreased heat carrying from the rack.
There is (my also) another objective:
- in future you can decide to purchase static/dynamic airflow management, then you will need to install fans and thermal sensors.
Finally it is better for any kind of maintenance or dust inspection/cleaning.
Of course we can speak about another points. But this is short recommendations related to home/SME operation.
well the heavy duty 2-post from startech is good imo : Open-Frame Server Rack - 12U | Server Racks | StarTech.comFor giggles, if all else fails, with a two-post rack you could try balancing the NAS on top of them