Are the disk partitions properly aligned to 4k boundary on the host (and in the guests too) ? See http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html and this: http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance On 2/8/2016 8:12 PM, Gokan Atmaca wrote: > Hello > > I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very > increases. It consumes up to 99%. For this reason, slowing down the > other virtual machine. What should I do to solve the problem. ? > > Thanks.. > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > https://lists.centos.org/mailman/listinfo/centos-virt