День добрий!
Sat, Oct 26, 2019 at 01:04:28AM +0800, changcheng.liu wrote:
> What's your ceph version? Have you verified whether the problem could be
> reproduced on master branch?
As an option, it can be Jumbo Frames related bug. I had completely disabled JF
in order to use RDMA over Ethernet on mlx4.
> On 08:33 Fri 25 Oct, Mason-Williams, Gabryel (DLSLtd,RAL,LSCI) wrote:
> > I am currently trying to run Ceph on RDMA, either RoCE 1 or 2. However,
> > I am experiencing issues with this.
> >
> > When using Ceph on RDMA I experience issues where OSD’s will randomly
> > become unreachable even if the cluster is left alone alone, it also is
> > not properly talking over RDMA and using Ethernet when the config
> > states it should as shown by the same results in the bench marking of
> > the two setups.
> >
> > After reloading the cluster
> > [cid:36020940-0085-40fc-bb5b-d91de6ace453]
> >
> > After 5m 9s the cluster went from being healthy to down.
> >
> > [cid:ed084bcc-0b97-44bd-9648-ce2e06859cd5]
> >
> > This problem even happens when running a bench mark test on the
> > cluster, OSD’s will just fall over. Another curious issue is that it is
> > not properly talking over RDMA as well and instead using the Ethernet.
> >
> > [cid:05e9dc68-075e-425d-b76b-ce7fa1d2f7a8]
> >
> > Next test:
> >
> > [cid:4183557e-b1da-41f3-afc3-f081b9fb4034]
> >
> > The config used for the RDMA is a so:
> >
> > [global]
> >
> > fsid = aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa
> >
> > mon_initial_members = node1, node2, node3
> >
> > mon_host =xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx, xxx.xxx.xxx.xxx
> >
> > auth_cluster_required = cephx
> >
> > auth_service_required =cephx
> >
> > auth_client_required = cephx
> >
> > public_network = xxx.xxx.xxx.xxx/24
> >
> > cluster_network = yyy.yyy.yyy.yyy/16
> >
> > ms_cluster_type =async+rdma
> >
> > ms_public_type = async+posix
> >
> > ms_async_rdma_device_name = mlx4_0
> >
> > [osd.0]
> >
> > ms_async_rdma_local_gid = xxxx
> >
> > [osd.1]
> >
> > ms_async_rdma_local_gid = xxxx
> >
> > [osd.2]
> >
> > ms_async_rdma_local_gid =xxxx
> >
> > Tests to check the system is using RDMA
> >
> > sudo ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show |
> > grep ms_cluster
> >
> > OUTPUT
> >
> > "ms_cluster_type": "async+rdma",
> >
> > sudo ceph daemon osd.0 perf dump AsyncMessenger::RDMAWorker-1
> >
> > OUTPUT
> >
> > {
> >
> > "AsyncMessenger::RDMAWorker-1": {
> >
> > "tx_no_mem": 0,
> >
> > "tx_parital_mem": 0,
> >
> > "tx_failed_post": 0,
> >
> > "rx_no_registered_mem": 0,
> >
> > "tx_chunks": 9,
> >
> > "tx_bytes": 2529,
> >
> > "rx_chunks": 0,
> >
> > "rx_bytes": 0,
> >
> > "pending_sent_conns": 0
> >
> > }
> >
> > }
> >
> > When running over Ethernet I have a completely stable system with the
> > current benchmarks as so
> >
> > [cid:544ecbbc-10d9-43e6-ab2f-aa7c2bcd88c0]
> >
> > Config setup when using Ethernet is
> >
> > The Config setup when using Ethernet is
> >
> > [global]
> >
> > fsid = aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa
> >
> > mon_initial_members = node1, node2, node3
> >
> > mon_host =xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx, xxx.xxx.xxx.xxx
> >
> > auth_cluster_required = cephx
> >
> > auth_service_required =cephx
> >
> > auth_client_required = cephx
> >
> > public_network = xxx.xxx.xxx.xxx/24
> >
> > cluster_network = yyy.yyy.yyy.yyy/16
> >
> > ms_cluster_type =async+posix
> >
> > ms_public_type = async+posix
> >
> > ms_async_rdma_device_name = mlx4_0
> >
> > [osd.0]
> >
> > ms_async_rdma_local_gid = xxxx
> >
> > [osd.1]
> >
> > ms_async_rdma_local_gid = xxxx
> >
> > [osd.2]
> >
> > ms_async_rdma_local_gid =xxxx
> > Tests to check the system is using async+posix
> >
> > sudo ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show |
> > grep ms_cluster
> >
> > OUTPUT
> >
> > "ms_cluster_type": "async+posix"
> >
> > sudo ceph daemon osd.0 perf dump AsyncMessenger::RDMAWorker-1
> >
> > OUTPUT
> >
> > {}
> >
> > This clearly a issue with RDMA and not with the OSD's shown by the fact
> > the system is completely fine over Ethernet and not with RDMA.
> >
> > Any guidance or ideas on how to approach this problem to make Ceph work
> > with RDMA would be greatly appreciated.
> >
> > Regards
> >
> > Gabryel Mason-Williams, Placement Student
> >
> > Address: Diamond Light Source Ltd., Diamond House, Harwell Science &
> > Innovation Campus, Didcot, Oxfordshire OX11 0DE
> >
> > Email: gabryel.mason-williams@xxxxxxxxxxxxx
> >
> >
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