I believe the 7.3 kernel was rebased to the latest stable upstream kernel implementations of libceph + krbd, so it's possible lots of things were fixed. If you search this mailing list, you will find lots of threads about debugging stuck IO in krbd. On Tue, Jun 27, 2017 at 2:50 AM, 码云 <wang.yong@xxxxxxxxxxx> wrote: > Hi Jason, > In one VDI integrated test environment, we need to known the best practise. > It seems like librbd performance weak than krbd. > qemu 2.5.0 is not link to librbd unless manual configure and compile it. > By the way, rbd and libceph ko code are both adjusted lots of place in the > centos7.3, > are they fixed for something? > Tks and Rgds. > > > > ------------------ 原始邮件 ------------------ > 发件人: "Jason Dillaman";<jdillama@xxxxxxxxxx>; > 发送时间: 2017年6月27日(星期二) 上午7:28 > 收件人: "码云"<wang.yong@xxxxxxxxxxx>; > 抄送: "ceph-users"<ceph-users@xxxxxxxxxxxxxx>; > 主题: Re: qemu-kvm vms start or reboot hang long time whileusing > the rbd mapped image > > May I ask why you are using krbd with QEMU instead of librbd? > > On Fri, Jun 16, 2017 at 12:18 PM, 码云 <wang.yong@xxxxxxxxxxx> wrote: >> Hi All, >> Recently.I meet a question and I did'nt find out any thing for explain it. >> >> Ops process like blow: >> ceph 10.2.5 jewel, qemu 2.5.0 centos 7.2 x86_64 >> create pool rbd_vms 3 replications with cache tier pool 3 replication >> too. >> create 100 images in rbd_vms >> rbd map 100 image to local device, like /dev/rbd0 ... /dev/rbd100 >> dd if=/root/win7.qcow2 of=/dev/rbd0 bs=1M count=3000 >> virsh define 100 vms(vm0... vm100), 1 vms configured 1 /dev/rbd . >> virsh start 100 vms. >> >> when the 100 vms start concurrence, will caused some vms hang. >> when do fio testing in those vms, will casued some vms hang . >> >> I checked ceph status ,osd status , log etc. all like same as before. >> >> but check device with iostat -dx 1, some rbd* device are strange. >> util% are 100% full, but read and wirte count all are zero. >> >> i checked virsh log, vms log etc, but not found any useful info. >> >> Can help to fingure out some infomartion. librbd krbd or other place is >> need to adjust some arguments? >> >> Thanks All. >> >> ------------------ >> 王勇 >> 上海德拓信息技术股份有限公司-成都研发中心 >> 手机：15908149443 >> 邮箱：wangyong@xxxxxxxxxxx >> 地址：四川省成都市天府大道666号希顿国际广场C座1409 >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > > > -- > Jason -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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