[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] DomU IO issue
Hi,i have the same issue with hvm guest. It looks like that the data reading and writing is sequential. But i have no clue waht i can do. Disk performance on the same device is under Dom0 is fine. Stefan Hi,what are the mount options (/etc/fstab) on the DomU ?In the xen-tools "partitions.d" example, "sync" is used, which give poor performance.this is my fstab (DomU) # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=620 0 0/dev/sda1 none swap sw 0 0 /dev/sda2 / ext3 noatime,nodiratime,errors=remount-ro 0 1 StefanOlivier Stefan Below a écrit :This is the domU config file: kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz" memory = '2048' vcpus=2 disk = [ 'phy:/dev/vg0/tsIbex-disk,xvda,w', 'phy:/dev/vg0/tsIbex-swap,xvdb,w', ] extra = "(hd0)/boot/grub/menu.lst" name = 'tsIbex' vif = [ 'ip=192.xxx.xxx.xxx,mac=xx:xx:xx:xx:xx' ] on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'restart' Dom0 Hardware and configuration: Q6600 with 8GB RAMsw Raid10,f2 Layout with 4 disks (i know, hardware raid is better.....) (storage for DomU via LVM)sw Raid1 with 4 disks for Dom0 root partition Debian Lenny, xen 3.3.1, with Kernel 2.6.26-1-xen-amd64. Anything else i should provide? Thanks, StefanCould use some more detail - DomU config and a description of the storage and hardware would be good.Best Regards Nathan Eisenberg Sr. Systems Administrator Atlas Networks, LLC support@xxxxxxxxxxxxxxxx http://support.atlasnetworks.us/portal -----Original Message-----From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Stefan BelowSent: Tuesday, June 16, 2009 12:50 PM To: xen-users@xxxxxxxxxxxxxxxxxxx Subject: [Xen-users] DomU IO issue Hello,i have a a big io issue with my PV-Guest (Ubuntu 9.04). When i write or copy large files, the hdd performance is very slow.This is my iostat output. It looks like that the datat is not reading and written the same time.File copy in DomU (PV Guest, LVM)Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1718,00 2816,00 6,71 11,00 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,00 0,00 0,00 99,00Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2232,67 0,00 8,72 0,00 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,98 0,00 0,99 97,03Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1079,00 4959,00 4,21 19,37 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,00 0,00 0,00 99,00Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2866,00 0,00 11,20 0,00 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,99 0,00 0,99 1,98 0,00 96,04Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2719,00 0,00 10,62 0,00 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 0,00 0,00 0,00 100,00Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1264,00 0,00 4,94 0,00 8,00 0,00 0,00 0,00 0,00File copy from Dom0 shows up a normal behavior: avg-cpu: %user %nice %system %iowait %steal %idle 0,99 0,00 13,86 78,22 0,00 6,93Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 13504,00 13325,00 52,75 52,05 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 10,00 81,00 0,00 9,00Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 11155,45 11163,37 43,58 43,61 8,00 0,00 0,00 0,00 0,00avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 15,84 76,24 0,99 6,93Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 12226,00 12302,00 47,76 48,05 8,00 0,00 0,00 0,00 0,00I am running xen 3.3.1 on Debian Lenny Dom0, Kernel 2.6.26-1-xen-amd64.Thanks a lot Stefan _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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