Xen users - Apr 2010 - harddisk offline frequently when running vm

without starting vm, we did decompression stress test. harddisk
offline did not happen.
when some vms are running, we did decompression stress test. harddisk
offline happened frequently.

We suspect that system interruption loss causes the problem.
did anybody meet this problem? or have an idea?

our env :
hardware :
      Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
      SCSI storage controller: LSI Logic / Symbios Logic SAS1068E
PCI-Express Fusion-MPT SAS (rev 08)
compile env and filesystem :
      Redhat AS 5.4
kernel:
      pv_ops 2.6.31.13

xm info :
-----------------------------------------------------------------
host                   : r02k08015
release                : 2.6.31.13xen
version                : #1 SMP Tue Apr 13 20:38:51 CST 2010
machine                : x86_64
nr_cpus                : 16
nr_nodes               : 2
cores_per_socket       : 4
threads_per_core       : 2
cpu_mhz                : 2266
hw_caps                :
bfebfbff:28100800:00000000:00001b40:009ce3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 24539
free_memory            : 15596
node_to_cpu            : node0:0,2,4,6,8,10,12,14
                        node1:1,3,5,7,9,11,13,15
node_to_memory         : node0:3589
                        node1:12007
node_to_dma32_mem      : node0:2584
                        node1:0
max_node_id            : 1
xen_major              : 4
xen_minor              : 0
xen_extra              : .0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : dom0_mem=10240M
cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)
cc_compile_by          : root
cc_compile_domain      :
cc_compile_date        : Tue Apr 13 23:04:16 CST 2010
xend_config_format     : 4
---------------------------------------------------------------------------

Cheers,
wyb

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