What's your ceph version? Have you verified whether the problem could be
reproduced on master branch?
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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