[Xen-users] LVM over FC-San poor performance

[Mice <mice1982@xxxxxxxxx>]

Hi, all

We are about to test the performance with FC-SAN
Currently there are 15 Hypervisors connected to a 16T LUN with 4G fiber channel. 
LVM is used to manage the VM's disks, VM's disk image is created as logic volume over the LUN.
All VMs are HVM.

when dd the lv from dom0, the performance is acceptable, range from 150 ~ 300MB/s
but when dd the local disk in guestOS (centOS 5.5 domU), the peformance is poor, about 40MB/s

my question is, is this normal? if not, any clues for performance tuning?

Thanks & Regards
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