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I want to set up a raspberry Pi with OwnCloud on it and a set of external USB drives (3.0). These drives will also be setup in a RAID. Will this setup be capable of high enough speeds to make this useable? Does anyone have experience with this?

I will also be setting up a separate Raspberry Pi with some VMs that will use the OwnCloud as their files backing. Will that be too slow?

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Will this setup be capable of high enough speeds to make this useable?

I get about 30 MB/s either way to an external HDD.

I will also be setting up a separate Raspberry Pi with some VMs

You choices there are I think limited; there are no real VMs available, but you may be able to use containers.

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  • 30 MB/s is fairly decent for USB 2.0 (you'll never get the 480 MBit/s), but you probably meant to refer to USB 3.0 -- which the Pi doesn't support, so it won't be any faster with a 3.0-device than with a 2.0-device.
    – n.st
    Dec 17, 2013 at 21:04
  • @n.st Actually I thought USB 2.0 was upto 150 MB/s -- but I'm wrong. So it's not so bad.
    – goldilocks ♦
    Dec 17, 2013 at 21:24
  • @goldilocks What's the setup you have that gives 30MB/s? (and is that megabytes or megabits?)
    – Don Rhummy
    Dec 18, 2013 at 17:25
  • @DonRhummy : MB = Megabytes. That's with an external HDD attached to a powered hub. Besides being waterproof, I don't think there's anything unusual about the HDD.
    – goldilocks ♦
    Dec 18, 2013 at 17:33
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Probably not. It does depend on your needs of course.

Remember that getting data to the network from a USB HDD has to fight over a single USB channel.

I see real speeds of about 10MB/s which is slooow if you are waiting for a large file to copy over.

For background tasks like backups etc. You can transfer a decent amount per hour/day

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I've been running ownCloud on an RPi B+ for a while, with the files residing on an external NAS. File upload/download speed was Ok -- you're limited to 10 MB/s in any case because of the Pi's 100 Mbit/s Ethernet interface. But, the CPU utilization was near 100% because of all the PHP and MySQL processing, leading to pretty bad response times when handling multiple files. I upgraded to an RPi 2 now, which seems more than fast enough.

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In my experience the single most important performance trick for OwnCloud / NextCloud is to enable HTTP2. This will literally save you 2-5 seconds in every page load, starting with the login.

The next big step is to disable transactional file locks if you don't need them (no files shared between users and no schizophrenic users opening multiple sessions and simultaneously editing the same file), or at least moving them to memcache.locking backend instead of the database.

Only once the above optimizations are done, the performance gain from a RAID storage may start to matter.

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