RAID build time

  • Dear All,


    just a short question, is a building time of Mirror Raid with 2 500GB WD disks (pluged in with USB 2.0.) of 30h and a speed of around 4500KB/sec normal?


    The system is a banana pi with:


    OMV 2.2.1 @ AMD Athlon(tm) XP 3000+
    OMV 2.2. @ Banana Pi M1 (only for testing)

    • Offizieller Beitrag

    On an arm device with usb hard drives, it is slow but not unrealistic.

    omv 7.0.5-1 sandworm | 64 bit | 6.8 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.13 | compose 7.1.4 | k8s 7.1.0-3 | cputemp 7.0.1 | mergerfs 7.0.4


    omv-extras.org plugins source code and issue tracker - github - changelogs


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  • Hi,


    you might find this interesting in terms of tuning your raid-rync times. Short but with enough explanation.
    http://www.cyberciti.biz/tips/…resync-rebuild-speed.html


    I'm not if this applies to your build as you have different hardware involved which could limit the performance. USB 2.0 and the HDD's should not be the issue.
    I'm not familiar with the BananaPI, but maybe the USB controller uses a lower bandwidth or even shared among all USB interfaces.


    But your real issue is your CPU, you are using a software Raid, which means all RAID processing will be done by your CPU. Having a closer look at your average load it seems your BananaPI more than loaded while RAIDsync, see:


    Zitat


    ==================
    = Uptime
    ================================================================================
    09:04:00 up 23:36, 0 users, load average: 3.14, 2.56, 2.30


    The BananaPI M1 just got a Dual-Core ARM. So your load average indicates that your CPU was loaded which affects the RAID Sync speed.


    Further information about determining load average:
    http://blog.scoutapp.com/artic…derstanding-load-averages



    Greets,
    Joker

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