Yesterday my server crash ,  all my virtual machines shutdown
more happen some thing strange , a virtual machine (windows 2003
standard) don't save last changes . Is possible virtual machine don't
save information ? 
  
  
  
  Jun 29 12:16:09 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422086
  Jun 29 12:16:09 xenSRV kernel: lost page write due to I/O error
on dm-5
  Jun 29 12:16:09 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422090
  Jun 29 12:16:09 xenSRV kernel: lost page write due to I/O error
on dm-5
  Jun 29 12:16:09 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422090
  Jun 29 12:16:09 xenSRV kernel: lost page write due to I/O error
on dm-5
  Jun 29 12:16:09 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422100
  Jun 29 12:16:09 xenSRV kernel: lost page write due to I/O error
on dm-5
  Jun 29 12:16:11 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422086
  Jun 29 12:16:11 xenSRV kernel: lost page write due to I/O error
on dm-5
  Jun 29 12:18:16 xenSRV kernel: Buffer I/O error on device dm-5,
logical block 2251799816422100
  Jun 29 12:18:16 xenSRV kernel: lost page write due to I/O error
on dm-5
  [root@xenSRV ~]#