what kind of read/write speeds should I expect with RAID10

    • OMV 4.x

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    • what kind of read/write speeds should I expect with RAID10

      I'm new to OMV and RAID in general. This is really my first setup. I setup OMV as a VM in ESXi. I connected four 8TB WD80EFZX 5400RPM HDDs in RAID10. What kind of read/write speed should I expect to be getting? I tried NAS performance tester 1.7 and I got an average write speed of 67 MB/sec and average read speed of 95 MB/sec. This seems a bit slow to me, but I don't really have anything to compare it to other than copying directly to a HDD. Help is appreciated.
    • stratege1401 wrote:

      normal use of 1 HDD.
      So you're saying if I had 100 MB/sec write speeds on a local HDD, I should get 200 MB/sec write speeds in the RAID? That's not the case as you can see above. What kind of diagnostics can I do to investigate this?

      Also, when I was looking around the OMV UI, I noticed that in the RAID Management page, my raid is showing up with a "clean, degraded" state. What does that mean? I just set up this raid 2 weeks ago with brand new HDDs. What does degraded mean? I checked the smart values of the drives and they're all green/good.

      Here are some outputs:

      cat /proc/mdstat

      Source Code

      1. Personalities : [raid10] [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
      2. md0 : active raid10 sde[3] sdc[1]
      3. 15627790336 blocks super 1.2 512K chunks 2 near-copies [4/2] [_U_U]
      4. bitmap: 117/117 pages [468KB], 65536KB chunk
      5. unused devices: <none>
      Anything else I can provide?
    • theoricaly yes. But hardware, bios, controllers, motherboard are a factor in that theorize.

      raid-calculator.com/default.aspx

      hardwaresecrets.com/does-raid0-really-increase-disk


      When you create an array, it gets mostly 2 status:
      - clean: everything is working fine. Hardware is good, data status is good.
      - degraded: something wrong, or creation synchronization of data is not finish.

      An raid 6 array of 6 HDD of 1TO takes up to three hours to initialize and depending of system will appears as building, degraded or synchronizing...
      ---------------------------------------------------------------------------------------------------------------------
      French, so forgive my english
      Personal Rig: valid.x86.fr/v72uek as a test bench with Oracle VM.
      And YES, my avatar is real, i am flying "parapentes" in St Hilaire du Touvet and at la coupe icare.
    • Re,

      stratege1401 wrote:

      4x read and 2x write speed gain
      absolutely theoretically ...

      stratege1401 wrote:

      When you create an array, it gets mostly 2 status:
      or broken/dead/false ...

      atomicrabbit wrote:

      What does degraded mean?
      That one or more drives are missing. In your mdstat-output are only two of four drives listed and stated ...

      You should fix that first - look in the logs for information about the failing drives!

      Sc0rp
    • Thank you for pointing again the most obvious theorical statement i wrote:

      "theoricaly yes. But hardware, bios, controllers, motherboard are a factor in that theorize."
      "When you create an array, it gets mostly 2 status:" forget to add death because it did not mention it, broken because some system dont even mention it and go directly for degraded.
      "degraded: something wrong, or creation synchronization of data is not finish." means a disk is missing, or data is corrupted, or sync is not finis, or alien are really from mars !!! HO NO, i did forget to mention a disk might be missing.

      And concerning degraded array, the most simple but not obvious cause is a BAD SATA CABLE: clean, degraded array state after only a couple weeks of setting it up
      ---------------------------------------------------------------------------------------------------------------------
      French, so forgive my english
      Personal Rig: valid.x86.fr/v72uek as a test bench with Oracle VM.
      And YES, my avatar is real, i am flying "parapentes" in St Hilaire du Touvet and at la coupe icare.