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On 13/11/2021 16:52, Rich Freeman wrote: |
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> On Sat, Nov 13, 2021 at 12:35 AM William Kenworthy <billk@×××××××××.au> wrote: |
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>> |
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>> Look at the odroid HC4 - I am using 5x the older HC2 version for moosefs |
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>> - they are USB3 based but work well in this application. They are arm32 |
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>> but 64bit is not needed. |
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> |
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> I like the idea behind the HC series Odroids, but being limited to 1-2 |
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> drives per node seems a bit contraining. With the USB3 approach there |
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> really is no limit to how many drives I can put on a node, as long as |
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> I don't mind the performance drop. I'm more concerned with static |
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> storage capacity in this case. If you're using 1Gbps ethernet then I |
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> guess two drives is already going to saturate the network if they're |
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> able to read sequentially. |
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> |
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Note that the md-raid advice is "do NOT use USB. We don't understand |
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why, but bad things seem to happen". Even when explicitly designed for |
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it, multiplexing drives on a single comms channel isn't always a good |
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idea... |
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|
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Years ago I built a CD copy station. Can't remember the exact layout, |
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but it was something like three CD-writers and a hard drive on PATA-0 |
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and PATA-1. I think the CD-writers achieved something like 0.5x speeds! |
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So we bought two add-in cards, with the hd and first CD-writer were on |
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PATA-0, and one CD-writer each on PATA-1, PATA-2 and PATA-3. They FLEW! |
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They were something like 32x drives and really achieved a full write in |
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about 2 minutes! |
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Cheers, |
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Wol |
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