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: [ceph-users] qemu-kvm vms start or reboot hang long time whileusing the rbd mapped image
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
>
>
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>
--
Jason
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