Disk Drive performance with Windows7

Jason Moore
Sat, 13 Sep 2014 21:42:02 -0000

Hi All,

I'm hoping someone can possible point me in a direction to help with
poor disk performance.

I have XEN 4.4.0  running on Ubuntu server 14.04.1 with Windows 7 64bit
with SP1 within a DomU.

Dom0 has 3 pinned VCPU's and ballooning has been disabled with 2GB of
memory locked to it.

I have installed the GPL PV signed drivers version 0.11.0.372 within
Windows.

I have virtualization (VT-x) enabled and IOMMU (VT-d) enabled and xen
see's it enabled.

I'm having a hard time running a simple MS SQL 2012 database within
Windows.  I'm getting all sorts of I/O timeout errors.

The computer has a ASUS P9X79 Pro mother board with the Intel i7-4930K
CPU.  The Dom0 is running on it's own hard drive.

I'm running two Western Digital 3TB  Black SATA drives plugged into
6GB/s ports.  These drives have Software RAID 1 running mirrored and the
DomU is running within LVM partition on the raid array.  I've tried
putting the SQL files on a dedicated drive with no raid or lvm and still
the same results.

Any ideas to improve throughput or so I don't get SQL error # 833 (i/o
timeouts) within windows?

Thanks so much.
Jason


Here's my config for the DomU
----------------------------------------------
builder='hvm'
memory = 24672
vcpus = 9

# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
shadow_memory = 10
name = "iaisync01new"

vif = [ 'bridge=xenbr0, model=e1000, mac=00:16:3E:4F:1A:35' ]
acpi = 1
apic = 1
disk = [ 'phy:/dev/vg0/iaisync01_new,xvda,w',
'phy:/dev/vg0/iaisync01_datanew,xvdb,w', 'phy:/dev/sdd1,xvdc,w'
]

#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
boot="c"
sdl=0
vnc=1
vncconsole=1
vncpasswd='insight'

#serial='pty'
usbdevice='tablet'
localtime=1



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