Piotr Jasiukajtis wrote:
Hi,
How can I improve performance of Windows XP / Windows Server 2003
using .vmdk files?
The guests are extremely slow on .vmdk files instead of raw zvols.
They shouldn't be...
Are you using PV drivers? What's the disk entry on the
guest?
xm list -l <guest>
e.g. here's one of mine..
(device
(tap
(uuid b6493411-5a81-798c-8683-d3e60e817e5a)
(bootable 0)
(dev hda:disk)
(uname tap:vdisk:/tank/guests/windows7/disk0)
(mode w)
(backend 0)
)
How disk you create the vmdk file? With vdiskadm?
Is the disk on a local filesystem? If so UFS or ZFS?
If ZFS, did you set the record size to 8k (zvols default
to 8K.
i.e.
# zfs get recordsize tank/guests
: alpha[1]#; zfs set recordsize=8k tank/guests
: alpha[1]#; zfs get recordsize tank/guests
NAME PROPERTY VALUE SOURCE
tank/guests recordsize 8K local
: alpha[1]#;
NOTE: the record size is valid for files created
*after* the record size is set. Anything created
before you modify it continues to use the old setting.
MRJ
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