PUIS (Power Up In Standby) for staggered spin up help

[timekiller]

I need to do staggered spin up on my server, the drives draw too much power on startup. I'm looking at the Highpoint Rocket 750, but to enable PUIS you need to use their software. I'm curious if anyone has gotten this software to run on an unraid box? Is there another alternative I'm missing?

 

Thanks!

[JonathanM]

Unless you keep your drives spinning all the time when Unraid is running, staggered spin up is useless.

 

Reason being, if Unraid gets a read error from a drive for whatever reason, the first thing it does is recreate the data that should have been returned from the errored drive from the parity information on all the rest of the disks, and attempts to write those reconstructed bits back to the errored drive.

 

That means that all spun down drives are immediately spun up as soon as possible. So, the server will be at max power draw any time an error is detected on a drive, if your power supply can't handle it, very bad things can happen to your data.

 

So, your choices are to either provide enough power to spin up all drives from standby without issue, or figure out staggered spin up when you turn on, and never allow unraid to spin down your drives.

[timekiller]

I actually don't allow the drives to spin down. I found the delay when trying to access data was too much.

[JonathanM]

So that option is not available in the card's BIOS? It would be strange to need OS level software to change something that is needed for a successful boot.

[timekiller]

actually, now that I found a manual, it looks like you can do it in the BIOS! Thanks.

[JonathanM]

👍