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--- fester112:hardware_general [2017/06/24 18:02] – external edit A User Not Logged in
+++ fester112:hardware_general [2019/05/26 21:14] – [Power Supply Units (PSUs) and Uninterruptible Power Supplies (UPSs)] admin
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   - Don’t buy low quality PSUs.
   - When selecting a PSU for a quiet server build chose one that will operate at around 50% – 60% of its rated maximum wattage. So if your server draws 300W, select a PSU with a maximum rating of around 600W.
-  - If you have time have a look at __[[https://forums.freenas.org/index.php?threads/proper-power-supply-sizing-guidance.38811/|this]]__article by Jgreco. It is excellent and should help.
+  - If you have time have a look at __[[https://forums.freenas.org/index.php?threads/proper-power-supply-sizing-guidance.38811/|this]]__ article by Jgreco. It is excellent and should help.
   - If your budget allows, invest in an Uninterruptible Power Supply (UPS). If your budget doesn't allow, adjust your budget until it does. I know it’s not the most seductive bit of kit (incidentally, the most seductive bit of kit I ever bought was a leather thong, but that’s another story) and it’s expensive (the UPS, not the thong!), but it is good practice to use one. Although the ZFS file system, along with the ZIL is designed to stop data corruption when experiencing a power outage, apparently it can still happen (I don’t know how or why??).
   - Some server PSUs will not work with a UPS that uses a simulated sine wave output. Some PSUs don’t seem to mind. The reasons are beyond the scope of this guide. I have seen the output of some simulated sine wave UPSs on an oscilloscope and some of them are shockingly bad and do not even come close to a sine wave. If you don’t want to take a chance, then get a UPS that provides a proper sine wave at its output. Unfortunately, this will cost you more.