Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board • Hacker News Board

Re: Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board

#71

Post by tutfbhuf » Tue, Feb 02, 2021, 7:28 AM UTC

vladvasiliu wrote: post #67

tutfbhuf wrote: post #34

Earlier quoted context omitted.

> Regarding the PSU, but you'd need a beefy adapter anyway for running 4 drives How about 2.5 inch drives? I'm thinking about: https://cdn-reichelt.de/bilder/web/xxl_ws/A300/RPI_NAS_4XSAT...

Regarding power usage, I'm not very familiar with how those drives compare [0]. To be honest, power consumption was of interest for the build I was talking about because I wanted it to be fanless (I actually ended up adding a very silent fan, just for peace of mind). For my NAS needs, I'm building in a recycled server, so power usage isn't as much of a concern. However, I did look for 2.5" drives (the server comes wi…

50W is way more than I am willing to operate. I want it to be extremely low powered. I think that a 2.5 inch SSD might be a better fit for me then, maybe M.2 if there's a adapter for the PI.

SSD and low cost is still possible, but one has to make compromises in terms of storage size. A 1 TB network drive would be enough for my use case, be it 4 x 256 SSD's or one big.

Re: Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board

#72

Post by tutfbhuf » Tue, Feb 02, 2021, 7:35 AM UTC

vladvasiliu wrote: post #68

tutfbhuf wrote: post #38

Earlier quoted context omitted.

> speeds will be lower and reliability may suffer 1Gbps is the max. anyways for my home setup, no matter how fast the drive is and I have a backup for important stuff, I'm not dependent on enterprise NAS drives. I want: extremely small, low cost and very low watt usage.

The main issue is that larger capacity drives (> 2TB) seem to be SMR in the 2.5" range. I've looked and haven't found a PMR one (except maybe for "enterprise" drives which cost more than an SSD). Depending on how you want to use those drives, you may be having a bad time. For example when rebuilding a ZFS pool. [0] If your use case / setup allow you to deal with the complete loss of your array (which, granted, is not…

RAID-Z2 on 4x2TB 2.5 inch HDD (without SMR) on a PI over 1 GbE sounds fine to me.

It's not super much space, but any two drives can fail, it's rather cheap and low powered + passive cooling should be possible.

Re: Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board

#73

Post by StillBored » Tue, Feb 02, 2021, 4:18 PM UTC

vladvasiliu wrote: post #26

88 wrote: post #20

Earlier quoted context omitted.

Presumably that board will need a separate PSU, RAM, storage for a boot drive, etc? Also it only has two SATA ports so would need a PCIe expansion card to match the four ports offered by the Pi board? I suspect the Pi is also significantly more power efficient?

There are similar motherboards with 4 SATA ports. I have an older Gigabyte GA-J3455N-D3H with 4 SATA ports and two gigabit network controllers that cost in the same ballpark as GP's model. RAM is accounted for in GP's description. Regarding the boot drive, you can either boot from the data disks (say via a common ZFS pool or a common raid + lvm) or if you're happy with a SD card for the PI, I suppose a small USB driv…

Well there are mITX boards with 8 or more SATA ports, and a lot of mATX boards with the same.

But the key differentiator IMHO is ECC and 10G. If one picks a board like https://www.gigabyte.com/Motherboard/C246N-WU2-rev-10 it then becomes possible to put a i3-9100/etc on it and gain ECC support. Given the 8 onboard SATA ports, and a 10G+ nic in the PCIe slot, you have a NAS that can best nearly everything on the market below a couple thousand dollars. There of course is a pretty wide range of atom/xeon boards with BMC's, and all of the above including the 10G. In the past I ran a https://www.asrockrack.com/general/productdetail.asp?Model=C... which has 12 sata ports, ECC and a BMC.

But, yes it will consume more than a rpi, and CPU power rating isnt everything. Having 8+ sata ports, bmcs, 10G ethernet, etc all up the board power consumption. But on the other hand, that i3 is rated for 65W, but idles at ~5 on a modern board, which is in the ballpark of the 2-3W of my RPi4 (which only swings a watt or so, and doesn't include the USB3 hub+devices).

So, given the NAS spends a lot of its time idle, and the power only spikes (and never to anything close to 65W) when its being used, it seems the extra power is worth the extra performance. I could probably fix the max frequency at 2Ghz like the RPi and save even more power.

Re: Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board

#74

Post by StillBored » Tue, Feb 02, 2021, 8:54 PM UTC

tutfbhuf wrote: post #71

vladvasiliu wrote: post #67

Earlier quoted context omitted.

Regarding power usage, I'm not very familiar with how those drives compare [0]. To be honest, power consumption was of interest for the build I was talking about because I wanted it to be fanless (I actually ended up adding a very silent fan, just for peace of mind). For my NAS needs, I'm building in a recycled server, so power usage isn't as much of a concern. However, I did look for 2.5" drives (the server comes wi…

50W is way more than I am willing to operate. I want it to be extremely low powered. I think that a 2.5 inch SSD might be a better fit for me then, maybe M.2 if there's a adapter for the PI. SSD and low cost is still possible, but one has to make compromises in terms of storage size. A 1 TB network drive would be enough for my use case, be it 4 x 256 SSD's or one big.

Peak power is significantly different from operational power on many of these setups. The intel setups, frequently idle at a 1/10th or less the rated power. The rpi4 OTOH, isn't nearly as dynamic, particularly if your running 64-bit debian. Its still just a few W, but its not going to drop down into the mW range when its idle because debian/etc doesn't have particularly good power mgmt on that board.

So in the end the rated W can be quite misleading, particularly for home use where the NAS will tend to sit idle a large part of the day.

Re: Build a Raspberry Pi CM4 4-Bay NAS with Wiretrustee Carrier Board

#75

Post by tutfbhuf » Wed, Feb 03, 2021, 7:22 AM UTC

StillBored wrote: post #74

tutfbhuf wrote: post #71

Earlier quoted context omitted.

50W is way more than I am willing to operate. I want it to be extremely low powered. I think that a 2.5 inch SSD might be a better fit for me then, maybe M.2 if there's a adapter for the PI. SSD and low cost is still possible, but one has to make compromises in terms of storage size. A 1 TB network drive would be enough for my use case, be it 4 x 256 SSD's or one big.

Peak power is significantly different from operational power on many of these setups. The intel setups, frequently idle at a 1/10th or less the rated power. The rpi4 OTOH, isn't nearly as dynamic, particularly if your running 64-bit debian. Its still just a few W, but its not going to drop down into the mW range when its idle because debian/etc doesn't have particularly good power mgmt on that board. So in the end th…

Okay, but what I really wanted to say is that I want a very small and low powered NAS without a big PSU. The PI is powered over USB, that's fine for me.