Hi , We have a strange problem, we have one xen host machine that seems to be playing up. when we move an image there, and start it it seems fine, but as soon as some IO starts happening on the guest it goes into 100 wait, but there is nothing happening on the host, its like 99 idle. When we moved the guest extracting the same tar.gz file took a minute with the same ram and cpu''s where as on the problem host it took 2 and a half hours. I''m not quite sure what information you would require in this situation as there are no errors anywhere that i can find. Both the host and guest are running CentOS, but the guest is a little behind(5.3 instead of 5.5 for the host). The other difference is that the host is 64 bit and the guest is 32. The guest resides in an img file. If we move the guest back to one of our other hosts it works fine. I have reinstalled the host with a fresh version to no avail, and its fully up to date, but the same problem. Xen has been installed via yum. [root@host ~]# rpm -qa | grep xen kernel-xen-2.6.18-194.8.1.el5 xen-libs-3.0.3-105.el5_5.4 xen-3.0.3-105.el5_5.4 [root@host ~]# cat /etc/redhat-release CentOS release 5.5 (Final) This is the guest config name = "soe" uuid = "" maxmem = 1024 memory = 1024 vcpus = 2 bootloader = "/usr/bin/pygrub" on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ ] disk = [ "tap:aio:/vm/soe.img,xvda,w" ] vif = [ "mac=,bridge=xenbr0" ] below are some vmstats(which aren''t 100 percent synced, but they look pretty much the same) on guest procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 12 0 6272 1440 948340 0 0 0 1832 106 172 0 0 0 100 0 0 12 0 6644 1440 948340 0 0 0 208 122 177 0 0 0 100 0 0 12 0 6644 1440 948340 0 0 0 0 62 165 0 0 0 100 0 0 12 0 6644 1440 948340 0 0 0 0 64 171 0 0 0 100 0 0 12 0 7268 1444 947968 0 0 0 136 1364 709 4 1 0 95 0 1 12 0 7268 1444 947956 0 0 0 0 98 168 0 0 0 100 0 6 12 0 7268 1444 947956 0 0 0 0 64 181 0 0 0 100 0 6 12 0 6896 1444 947956 0 0 0 1496 70 173 0 0 0 100 0 0 12 0 6400 1444 947956 0 0 0 1672 86 178 0 0 0 100 0 0 12 0 6648 1444 947956 0 0 0 824 146 213 0 0 0 100 0 0 12 0 6696 1444 947956 0 0 0 0 58 165 0 0 0 100 0 0 12 0 6696 1444 947956 0 0 0 0 81 169 0 0 0 100 0 on host procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 0 1 184 13320 5948 2133832 0 0 125 128 38 56 0 0 96 4 0 0 1 184 13328 5948 2133872 0 0 0 686 426 970 0 0 75 25 0 0 1 184 13328 5948 2133872 0 0 0 687 405 926 0 0 75 25 0 1 1 184 13328 5956 2133876 0 0 0 711 434 927 0 0 75 25 0 0 1 184 13328 5956 2133876 0 0 0 692 471 930 0 0 75 25 0 0 1 184 13328 5960 2133872 0 0 0 717 408 883 0 0 75 25 0 0 1 184 13328 5960 2133872 0 0 0 682 411 930 0 0 75 25 0 1 1 184 13328 5960 2133872 0 0 0 687 402 928 0 0 75 25 0 0 1 184 13328 5968 2133864 0 0 0 709 405 920 0 0 75 25 0 0 1 184 14524 5972 2132588 0 0 4100 587 1220 2807 2 0 77 20 0 Any ideas would be appreciated. Kind Regards, Rob Shaw _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users