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It's a SATA command so must be supported on the HDD too. The HDD powers up in Idle mode, then waits for a spin up command from the controller. This is to control the spin ups.
The purpose is to limit power spikes (these can get quite high) on the power supply during multi-drive spinups.
It is for NAS.
Then you want "WD Red"
Do Seagate NAS HDD's do PUIS? I have one of them here but cannot test it atm. These are also balanced for NAS long term use.
Do WD Red definatly do PUIS? What about HGST drives?
I am building a mini-ITX FreeNAS in a rack and want staggered spin up so the power supply doesn't have to be a huge one. Then I can fit maybe two smaller ones for redundancy.
I don't even know where u come up with this "PUIS" BS.
It is just "variable RPMs" is really all.
WD Red and Purple class/family all support "IntelliPower" with "variable RPMs"
Made for 24/7 operations; Red for NAS, Purple for Security Cams and alike applications.
Seagate aren't worth buying, period.
Not all have PUIS or PM2. They power up into idle state, and wait for a command to Spin up. The controller sends this command in sequence one by one to the HDD's as they finish their spin up . The power usage spike is very high on the initial spin up, if you have multiple HDD's that can put a huge demand on the power supply at the spin up stage, so you stagger it. It keeps the power spike constantly low to the same as a single drive starting up. This way you can use smaller power supplies and add redundancy.
It is a standard feature in HDD's (and in the SATA spec) for NAS servers. It is not BS, it is essential to have in racks or indeed any big raid / multi drive server.
It is NOT variable RPM, it is powering up to IDLE without spin up, waiting for spin up command, then it spins up. Variable RPM does not solve the spin up power spike on multiple drives. This makes spin up of say 5 drives the same power spike as 1, instead of a spike of 5 concurrent drives spinning up. Which can be HUGE.
If I do not have staggered spin up, I will have to have a huge Power supply in a standard 19" rack, I want to have two power supplies to add redundancy, so by staggering spin up I can get that.
Here you go {LINK USUNIĘTY}https://en.wikipedia.org/wiki/Spin-up
https://www.youtube.com/watch?v=pNu53PTAIcs
How many drives in a single RAID/NAS setup u doing?
And what SATA/SAS Controller?
Do all SATA drives have PUIS/PM2? At least all the NAS drives? I will be mixing HGST, WD and Seagate.
Not at all, for proper reliability you should MIX the brands. At the very least if you insist on keeping the same brand, you should select from DIFFERENT batches, you will have to source them from different places or find a specialist who can do that for you or ask the distributer but chances are, they're all the same batches.
If you have all drives from the same brand and model batch, you risk ALL failing at the same time from the same fault. If they are different, the chances drop significantly.
Not all from the same place at the same time.
I would just avoid mixing brands because they all differ greatly; especially when it comes to overall specs, speed, etc. I would say stick to WD and HGST; avoid any others.