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On Sun, Mar 1, 2020 at 2:13 AM William Kenworthy <billk@×××××××××.au> wrote: |
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> |
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> Keep in mind that rpi are not the only cheap, capable arm hardware out |
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> there. |
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> |
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I completely agree. Anytime I'm looking at an application I consider |
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the SBCs available as options. Certainly the odroids are highly |
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spoken of. |
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Main advantage of the Pi is its ubiquity - just about anything you |
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could want is already packaged and documented for it. It is also |
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pretty cheap. |
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> backed by an Odroid HC2 moosefs cluster (though I am using an intel |
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> powered Odroid H2 for the master). |
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I considered an HC2 for lizardfs. My problem with it is that it has a |
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single SATA port, which means you're buying a $50 SBC for every hard |
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drive in your cluster. |
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For a single drive per node it is probably your best bet. However, my |
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chunkservers are: |
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~$65 RockPro64 |
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$20 used LSI HBA |
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$5 wall wart |
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$25 cheap ATX PSU |
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$5 ATX power switch |
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$5 extra SATA cables |
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$5 powered 16x PCIe riser cable (these are a bit hard to find) |
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That is ~$125, and will support 16 hard drives. You're saving money |
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on the 3rd drive per node. If you want some kind of enclosure for the |
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drives you'll pay maybe another $5/drive. |
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The other option that might be worth considering if you don't mind |
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losing some bandwidth to the drives is just using SATA3 and hubs/etc |
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and external drives. I'm shucking external drives anyway. So, any |
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SBC with a SATA3 port would work for that, with nothing else needed. |
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I could see USB3 bandwidth (shared) being a constraint if you're |
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rebuilding, but it would keep up with gigabit ethernet. |
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Oh, and for any kind of NAS/etc solution make sure that whatever you |
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get has gigabit ethernet. The Pi3s at least don't have that - not |
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sure about the Pi4. Wouldn't help in a Pi3 anyway as I think the LAN |
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goes through the internal USB2 bus - the Pi is pretty lousy for IO in |
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general - at least conventional PC IO. That GPIO breakout is of |
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course nice for projects. |
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-- |
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Rich |
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