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Data ONTAP PowerShell Toolkit - Check Hyper-V disk alignment

cknight

Misaligned I/O to LUNs owned by virtual machines can cause severe performance bottlenecks.  The attached script leverages a new cmdlet in Toolkit 1.2, Get-NaHyperV, to check for misalignment in any Data ONTAP storage attached to Hyper-V virtual machines.  (The script works by examining real-time I/O statistics reported by Data ONTAP, so false readings are theoretically possible for virtual machines that are not running or are generating little or no I/O.)


PS C:\> Show-NaHyperVAlignment.ps1


Virtual Machine:  OpalisVM


    Disk:         O:\OpalisVM.vhd
    Type:         VHD
    Host path:    O:\
    Host disk:    \\.\PHYSICALDRIVE6
    Host volume:  \\?\Volume{4044589b-4fd9-4c90-8495-f430945e7439}\
    Controller:   dunn
    Address:      10.61.167.60
    Igroup:       viaRPC.iqn.1991-05.com.microsoft:x3550rre7.rtprre.testdomain
    ONTAP volume: opalis
    ONTAP LUN:    /vol/opalis/opalisVM
    LUN type:     hyper_v
    Aligned:      Yes


    Disk:         Disk 2 50.01 GB Bus 0 Lun 1 Target 2
    Type:         Passthrough
    Host path:
    Host disk:    \\.\PHYSICALDRIVE2
    Host volume:
    Controller:   benson
    Address:      10.61.167.61
    Igroup:       viaRPC.iqn.1991-05.com.microsoft:x3550rre7.rtprre.testdomain
    ONTAP volume: vol1
    ONTAP LUN:    /vol/vol1/testlun2
    LUN type:     hyper_v
    Aligned:      Yes


--------------------------------------------------------------------------------


Virtual Machine:  W2k3OpalisVM


    Disk:         P:\W2k3OpalisVM.vhd
    Type:         VHD
    Host path:    P:\
    Host disk:    \\.\PHYSICALDRIVE9
    Host volume:  \\?\Volume{b451b1cb-8dac-4161-8bfa-a4410e2691a8}\
    Controller:   dunn
    Address:      10.61.167.60
    Igroup:       viaRPC.iqn.1991-05.com.microsoft:x3550rre7.rtprre.testdomain
    ONTAP volume: opalis
    ONTAP LUN:    /vol/opalis/w2k3OpalisVM
    LUN type:     image
    Aligned:      *** No ***

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