External hard drive not showing up in RAID

    • OMV 4.x
    • External hard drive not showing up in RAID

      Hi,

      I am setting up my nas for the first time. I am using 3x500gb internal hard drive and 2x500gb external hard drive (connected via usb) however these drives are not showing up when I try to put them into RAID, I believe this is because the devices are connected via usb however I do not know what to do as I would like to have the extra 1 TB of space. Please let me know if I need a plugin or what I can do. As you can see from the images the drives are showing up but are not actually allowing me to put them in RAID

      Thank you
    • OMV does not allow you to use usb drives in a raid array because it is a very bad idea.
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    • table681 wrote:

      So just to clarify there is no way I can use external hard drives in a raid array.
      There is no way to create an array from the web interface using usb drives.

      table681 wrote:

      Can I ask why? (I know you said it was a very bad idea but could you clarify)
      Raid is intended to provide redundancy (not backup). Other than the fact that most home users don't need redundancy, usb drives are not cooled well, have a unreliable interface (usb), typically use cheap drives, have no way to provide redundant power, and are usually set to go to sleep after a short amount of inactivity. Most raid configurations will write to the drives more due to parity and/or mirroring. The drives will be put under a lot of stress generating a lot of heat when syncing. raid doesn't do well with usb drives that start slow at boot and will cause the array fail to assemble. raid doesn't do well with drives that go to sleep. Faster drives in the array can only read or write as fast as the slowest drive. Is that enough reasons?
      omv 4.1.22 arrakis | 64 bit | 4.15 proxmox kernel | omvextrasorg 4.1.15
      omv-extras.org plugins source code and issue tracker - github

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    • ryecoaaron wrote:

      Raid is intended to provide redundancy (not backup). Other than the fact that most home users don't need redundancy, usb drives are not cooled well, have a unreliable interface (usb), typically use cheap drives, have no way to provide redundant power, and are usually set to go to sleep after a short amount of inactivity. Most raid configurations will write to the drives more due to parity and/or mirroring. The drives will be put under a lot of stress generating a lot of heat when syncing. raid doesn't do well with usb drives that start slow at boot and will cause the array fail to assemble. raid doesn't do well with drives that go to sleep. Faster drives in the array can only read or write as fast as the slowest drive. Is that enough reasons?
      Thanks that is enough reasons I was just interested as I am new to all of this.

      My other question then is can I attach the usb storage drives to the nas and have them go through network (without raid or anything else) but still going through openmediavault and the nas if that makes sense.
    • table681 wrote:

      My other question then is can I attach the usb storage drives to the nas and have them go through network (without raid or anything else) but still going through openmediavault and the nas if that makes sense.
      Yes, you can attach usb drives, format them, and then share them.
      omv 4.1.22 arrakis | 64 bit | 4.15 proxmox kernel | omvextrasorg 4.1.15
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    • ryecoaaron wrote:

      OMV does not allow you to use usb drives in a raid array because it is a very bad idea.
      Does this mean if I get a raspberry pi 3 Model B+ I am not able to put the drives in RAID because the only way I can think of connecting the drives to a raspberry pi is by usb and you have said I am not able to do this. So I am wondering gif you know another way to connect the drives in RAID or another way of connecting the drives to the raspberry pi
    • table681 wrote:

      Does this mean if I get a raspberry pi 3 Model B+ I am not able to put the drives in RAID because the only way I can think of connecting the drives to a raspberry pi is by usb and you have said I am not able to do this. So I am wondering gif you know another way to connect the drives in RAID or another way of connecting the drives to the raspberry pi
      Obviously, usb is the only way to connect a drive to an RPi. Why do you insist on buying an RPi? And after all of my comments, why would you still insist on using usb drives in a raid array?
      omv 4.1.22 arrakis | 64 bit | 4.15 proxmox kernel | omvextrasorg 4.1.15
      omv-extras.org plugins source code and issue tracker - github

      Please read this before posting a question and this and this for docker questions.
      Please don't PM for support... Too many PMs!