Virtual drives performance

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello,

I'm trying to set up a fast virtualized Samba file server. I'm using Debian Sqeeze 64 bit as hypervisor. First, I created mirrored storage in hypervisor from one 600-gig partition (yes, that's correct - I have only one drive currently), details:
sudo mdadm --detail /dev/md3
/dev/md3:
        Version : 1.2
  Creation Time : Thu Jul 28 20:07:00 2011
     Raid Level : raid1
     Array Size : 664187352 (633.42 GiB 680.13 GB)
  Used Dev Size : 664187352 (633.42 GiB 680.13 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Thu Jul 28 22:07:10 2011
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : Server:3  (local to host Server)
           UUID : 87184170:2d9102b1:ca16a5d7:1f23fe2e
         Events : 3276

    Number   Major   Minor   RaidDevice State
       0       8       23        0      active sync   /dev/sdb7
       1       0        0        1      removed

Partition type is Linux RAID autodetect and this drive can do 80MB/s write and 100 MB/s read seq.

QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5)

Next, I've tried following combinations with virt-manager 0.8.4 (from XML of VM):
1.on Debian VM with virtio drivers for both storage and NIC:
<disk type='block' device='disk'>
<source dev='/dev/md3'/>
<target dev='vdb' bus='virtio'/>
partition type used in guest: EXT4
result: poor performance, 9-10MB/s sequentional copy via SMB
2.on Debian VM with virtio drivers:
<disk type='block' device='disk' cache='writeback'>
<source dev='/dev/md3'/>
<target dev='vdb' bus='virtio'/>
partition type used: EXT4
result: poor performance, 10-15MB/s sequentional copy via SMB
3.Direct attached partition to FreeBSD VM without virtio support (e1000 NIC and SCSI disk):
<disk type='block' device='disk' cache='writeback'>
<source dev='/dev/md3'/>
<target dev='sdb' bus='scsi'/>
partition type used: ZFS
result: poor performance, 20-25MB/s sequentional copy via SMB
4.Direct attached whole physical disk to FreeBSD VM (/dev/sdc 2,5")
partition type used in VM: ZFS
good performance, 60MB/s sequentional copy via SMB

I find that way it's not possible to direct attach PARTITION from host to VM using virt-manager, this only works for whole device (like /dev/sdc).

Anyway, any storage advices for performance?

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux