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?
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