# [OmniOS-discuss] horrible disk performance under KVM

Narayan Desai narayan.desai at gmail.com
Fri Sep 13 19:50:33 UTC 2013

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    Depending on the availability of the guest-side drivers, it should be a lot
    faster to use virtio, both for disk and net.

    Does anyone know if virtio support ships now in OmniOS? I know there have
    been some drivers floating around for a while now, but haven't tried them.
     -nld

    On Fri, Sep 13, 2013 at 1:45 PM, ashley willis <ashleywillis76 at gmail.com>wrote:

    > I have 14GB dump of a MongoDB database that took 10 minutes to restore
    > on bare metal OmniOS -- I'm fine with this (system is an 8-core AMD
    > FX-8150, 32GB ram, pair of 500GB WD 'blue" drives mirrored, 90GB ssd
    > cache -- all desktop-grade).
    >
    > Running OmniOS under KVM on this box, the same operation took 246
    > minutes with the dump available over an NFS share from the bare metal
    > system (given 2 cores, 2GB ram, and a 30GB zvol).
    >
    > Under the same KVM instance, I decided to see the performance reading
    > the dump from NFS and having the MongoDB data directory on this same
    > NFS share, and it's on track to finish in under 60 minutes (half-way
    > done). That's more than 4 times faster.
    >
    > What gives?
    >
    > /usr/bin/qemu-system-x86_64 -name OmniOS_Text_r151006p.iso -enable-kvm
    > -vnc 0.0.0.0:15 -smp 2 -m 2048 -no-hpet -localtime -drive
    > file=/dev/zvol/rdsk/rpool/omnios,if=ide,index=0 -net
    > nic,vlan=0,name=net0,model=e1000,macaddr=2:8:20:e:15:33 -net
    > vnic,vlan=0,name=net0,ifname=vnic10,macaddr=2:8:20:e:15:33 -vga std
    > -daemonize
    >
    > -ashley
    > _______________________________________________
    > OmniOS-discuss mailing list
    > OmniOS-discuss at lists.omniti.com
    > http://lists.omniti.com/mailman/listinfo/omnios-discuss
    >
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