There are a few things I don't like about your machines... If you want latency/IOPS (as you seemingly do) you really want the highest frequency CPUs, even over number of cores. These are not too bad, but not great either.
Also you have 2x CPU meaning NUMA. Have you pinned OSDs to NUMA nodes? Ideally OSD is pinned to same NUMA node the NVMe device is connected to. Each NVMe device will be running on PCIe lanes generated by one of the CPUs... What versions of TCMalloc (or jemalloc) are you running? Have you tuned them to have a bigger cache? These are from what I've learned using filestore - I've yet to run full tests on bluestore - but they should still apply... On Mon, Nov 27, 2017 at 5:10 PM, German Anders <gand...@despegar.com> wrote: > Hi Nick, > > yeah, we are using the same nvme disk with an additional partition to use > as journal/wal. We double check the c-state and it was not configure to use > c1, so we change that on all the osd nodes and mon nodes and we're going to > make some new tests, and see how it goes. I'll get back as soon as get got > those tests running. > > Thanks a lot, > > Best, > > > *German* > > 2017-11-27 12:16 GMT-03:00 Nick Fisk <n...@fisk.me.uk>: > >> *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf >> Of *German Anders >> *Sent:* 27 November 2017 14:44 >> *To:* Maged Mokhtar <mmokh...@petasan.org> >> *Cc:* ceph-users <ceph-users@lists.ceph.com> >> *Subject:* Re: [ceph-users] ceph all-nvme mysql performance tuning >> >> >> >> Hi Maged, >> >> >> >> Thanks a lot for the response. We try with different number of threads >> and we're getting almost the same kind of difference between the storage >> types. Going to try with different rbd stripe size, object size values and >> see if we get more competitive numbers. Will get back with more tests and >> param changes to see if we get better :) >> >> >> >> >> >> Just to echo a couple of comments. Ceph will always struggle to match the >> performance of a traditional array for mainly 2 reasons. >> >> >> >> 1. You are replacing some sort of dual ported SAS or internally RDMA >> connected device with a network for Ceph replication traffic. This will >> instantly have a large impact on write latency >> 2. Ceph locks at the PG level and a PG will most likely cover at >> least one 4MB object, so lots of small accesses to the same blocks (on a >> block device) will wait on each other and go effectively at a single >> threaded rate. >> >> >> >> The best thing you can do to mitigate these, is to run the fastest >> journal/WAL devices you can, fastest network connections (ie 25Gb/s) and >> run your CPU’s at max C and P states. >> >> >> >> You stated that you are running the performance profile on the CPU’s. >> Could you also just double check that the C-states are being held at C1(e)? >> There are a few utilities that can show this in realtime. >> >> >> >> Other than that, although there could be some minor tweaks, you are >> probably nearing the limit of what you can hope to achieve. >> >> >> >> Nick >> >> >> >> >> >> Thanks, >> >> >> >> Best, >> >> >> *German* >> >> >> >> 2017-11-27 11:36 GMT-03:00 Maged Mokhtar <mmokh...@petasan.org>: >> >> On 2017-11-27 15:02, German Anders wrote: >> >> Hi All, >> >> >> >> I've a performance question, we recently install a brand new Ceph cluster >> with all-nvme disks, using ceph version 12.2.0 with bluestore configured. >> The back-end of the cluster is using a bond IPoIB (active/passive) , and >> for the front-end we are using a bonding config with active/active (20GbE) >> to communicate with the clients. >> >> >> >> The cluster configuration is the following: >> >> >> >> *MON Nodes:* >> >> OS: Ubuntu 16.04.3 LTS | kernel 4.12.14 >> >> 3x 1U servers: >> >> 2x Intel Xeon E5-2630v4 @2.2Ghz >> >> 128G RAM >> >> 2x Intel SSD DC S3520 150G (in RAID-1 for OS) >> >> 2x 82599ES 10-Gigabit SFI/SFP+ Network Connection >> >> >> >> *OSD Nodes:* >> >> OS: Ubuntu 16.04.3 LTS | kernel 4.12.14 >> >> 4x 2U servers: >> >> 2x Intel Xeon E5-2640v4 @2.4Ghz >> >> 128G RAM >> >> 2x Intel SSD DC S3520 150G (in RAID-1 for OS) >> >> 1x Ethernet Controller 10G X550T >> >> 1x 82599ES 10-Gigabit SFI/SFP+ Network Connection >> >> 12x Intel SSD DC P3520 1.2T (NVMe) for OSD daemons >> >> 1x Mellanox ConnectX-3 InfiniBand FDR 56Gb/s Adapter (dual port) >> >> >> >> >> >> Here's the tree: >> >> >> >> ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF >> >> -7 48.00000 root root >> >> -5 24.00000 rack rack1 >> >> -1 12.00000 node cpn01 >> >> 0 nvme 1.00000 osd.0 up 1.00000 1.00000 >> >> 1 nvme 1.00000 osd.1 up 1.00000 1.00000 >> >> 2 nvme 1.00000 osd.2 up 1.00000 1.00000 >> >> 3 nvme 1.00000 osd.3 up 1.00000 1.00000 >> >> 4 nvme 1.00000 osd.4 up 1.00000 1.00000 >> >> 5 nvme 1.00000 osd.5 up 1.00000 1.00000 >> >> 6 nvme 1.00000 osd.6 up 1.00000 1.00000 >> >> 7 nvme 1.00000 osd.7 up 1.00000 1.00000 >> >> 8 nvme 1.00000 osd.8 up 1.00000 1.00000 >> >> 9 nvme 1.00000 osd.9 up 1.00000 1.00000 >> >> 10 nvme 1.00000 osd.10 up 1.00000 1.00000 >> >> 11 nvme 1.00000 osd.11 up 1.00000 1.00000 >> >> -3 12.00000 node cpn03 >> >> 24 nvme 1.00000 osd.24 up 1.00000 1.00000 >> >> 25 nvme 1.00000 osd.25 up 1.00000 1.00000 >> >> 26 nvme 1.00000 osd.26 up 1.00000 1.00000 >> >> 27 nvme 1.00000 osd.27 up 1.00000 1.00000 >> >> 28 nvme 1.00000 osd.28 up 1.00000 1.00000 >> >> 29 nvme 1.00000 osd.29 up 1.00000 1.00000 >> >> 30 nvme 1.00000 osd.30 up 1.00000 1.00000 >> >> 31 nvme 1.00000 osd.31 up 1.00000 1.00000 >> >> 32 nvme 1.00000 osd.32 up 1.00000 1.00000 >> >> 33 nvme 1.00000 osd.33 up 1.00000 1.00000 >> >> 34 nvme 1.00000 osd.34 up 1.00000 1.00000 >> >> 35 nvme 1.00000 osd.35 up 1.00000 1.00000 >> >> -6 24.00000 rack rack2 >> >> -2 12.00000 node cpn02 >> >> 12 nvme 1.00000 osd.12 up 1.00000 1.00000 >> >> 13 nvme 1.00000 osd.13 up 1.00000 1.00000 >> >> 14 nvme 1.00000 osd.14 up 1.00000 1.00000 >> >> 15 nvme 1.00000 osd.15 up 1.00000 1.00000 >> >> 16 nvme 1.00000 osd.16 up 1.00000 1.00000 >> >> 17 nvme 1.00000 osd.17 up 1.00000 1.00000 >> >> 18 nvme 1.00000 osd.18 up 1.00000 1.00000 >> >> 19 nvme 1.00000 osd.19 up 1.00000 1.00000 >> >> 20 nvme 1.00000 osd.20 up 1.00000 1.00000 >> >> 21 nvme 1.00000 osd.21 up 1.00000 1.00000 >> >> 22 nvme 1.00000 osd.22 up 1.00000 1.00000 >> >> 23 nvme 1.00000 osd.23 up 1.00000 1.00000 >> >> -4 12.00000 node cpn04 >> >> 36 nvme 1.00000 osd.36 up 1.00000 1.00000 >> >> 37 nvme 1.00000 osd.37 up 1.00000 1.00000 >> >> 38 nvme 1.00000 osd.38 up 1.00000 1.00000 >> >> 39 nvme 1.00000 osd.39 up 1.00000 1.00000 >> >> 40 nvme 1.00000 osd.40 up 1.00000 1.00000 >> >> 41 nvme 1.00000 osd.41 up 1.00000 1.00000 >> >> 42 nvme 1.00000 osd.42 up 1.00000 1.00000 >> >> 43 nvme 1.00000 osd.43 up 1.00000 1.00000 >> >> 44 nvme 1.00000 osd.44 up 1.00000 1.00000 >> >> 45 nvme 1.00000 osd.45 up 1.00000 1.00000 >> >> 46 nvme 1.00000 osd.46 up 1.00000 1.00000 >> >> 47 nvme 1.00000 osd.47 up 1.00000 1.00000 >> >> >> >> The disk partition of one of the OSD nodes: >> >> >> >> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT >> >> nvme6n1 259:1 0 1.1T 0 disk >> >> ├─nvme6n1p2 259:15 0 1.1T 0 part >> >> └─nvme6n1p1 259:13 0 100M 0 part >> /var/lib/ceph/osd/ceph-6 >> >> nvme9n1 259:0 0 1.1T 0 disk >> >> ├─nvme9n1p2 259:8 0 1.1T 0 part >> >> └─nvme9n1p1 259:7 0 100M 0 part >> /var/lib/ceph/osd/ceph-9 >> >> sdb 8:16 0 139.8G 0 disk >> >> └─sdb1 8:17 0 139.8G 0 part >> >> └─md0 9:0 0 139.6G 0 raid1 >> >> ├─md0p2 259:31 0 1K 0 md >> >> ├─md0p5 259:32 0 139.1G 0 md >> >> │ ├─cpn01--vg-swap 253:1 0 27.4G 0 lvm [SWAP] >> >> │ └─cpn01--vg-root 253:0 0 111.8G 0 lvm / >> >> └─md0p1 259:30 0 486.3M 0 md /boot >> >> nvme11n1 259:2 0 1.1T 0 disk >> >> ├─nvme11n1p1 259:12 0 100M 0 part >> /var/lib/ceph/osd/ceph-11 >> >> └─nvme11n1p2 259:14 0 1.1T 0 part >> >> nvme2n1 259:6 0 1.1T 0 disk >> >> ├─nvme2n1p2 259:21 0 1.1T 0 part >> >> └─nvme2n1p1 259:20 0 100M 0 part >> /var/lib/ceph/osd/ceph-2 >> >> nvme5n1 259:3 0 1.1T 0 disk >> >> ├─nvme5n1p1 259:9 0 100M 0 part >> /var/lib/ceph/osd/ceph-5 >> >> └─nvme5n1p2 259:10 0 1.1T 0 part >> >> nvme8n1 259:24 0 1.1T 0 disk >> >> ├─nvme8n1p1 259:26 0 100M 0 part >> /var/lib/ceph/osd/ceph-8 >> >> └─nvme8n1p2 259:28 0 1.1T 0 part >> >> nvme10n1 259:11 0 1.1T 0 disk >> >> ├─nvme10n1p1 259:22 0 100M 0 part >> /var/lib/ceph/osd/ceph-10 >> >> └─nvme10n1p2 259:23 0 1.1T 0 part >> >> nvme1n1 259:33 0 1.1T 0 disk >> >> ├─nvme1n1p1 259:34 0 100M 0 part >> /var/lib/ceph/osd/ceph-1 >> >> └─nvme1n1p2 259:35 0 1.1T 0 part >> >> nvme4n1 259:5 0 1.1T 0 disk >> >> ├─nvme4n1p1 259:18 0 100M 0 part >> /var/lib/ceph/osd/ceph-4 >> >> └─nvme4n1p2 259:19 0 1.1T 0 part >> >> nvme7n1 259:25 0 1.1T 0 disk >> >> ├─nvme7n1p1 259:27 0 100M 0 part >> /var/lib/ceph/osd/ceph-7 >> >> └─nvme7n1p2 259:29 0 1.1T 0 part >> >> sda 8:0 0 139.8G 0 disk >> >> └─sda1 8:1 0 139.8G 0 part >> >> └─md0 9:0 0 139.6G 0 raid1 >> >> ├─md0p2 259:31 0 1K 0 md >> >> ├─md0p5 259:32 0 139.1G 0 md >> >> │ ├─cpn01--vg-swap 253:1 0 27.4G 0 lvm [SWAP] >> >> │ └─cpn01--vg-root 253:0 0 111.8G 0 lvm / >> >> └─md0p1 259:30 0 486.3M 0 md /boot >> >> nvme0n1 259:36 0 1.1T 0 disk >> >> ├─nvme0n1p1 259:37 0 100M 0 part >> /var/lib/ceph/osd/ceph-0 >> >> └─nvme0n1p2 259:38 0 1.1T 0 part >> >> nvme3n1 259:4 0 1.1T 0 disk >> >> ├─nvme3n1p1 259:16 0 100M 0 part >> /var/lib/ceph/osd/ceph-3 >> >> └─nvme3n1p2 259:17 0 1.1T 0 part >> >> >> >> >> >> For the disk scheduler we're using [kyber], for the read_ahead_kb we try >> different values (0,128 and 2048), the rq_affinity set to 2, and the >> rotational parameter set to 0. >> >> We've also set the CPU governor to performance on all the cores, and tune >> some sysctl parameters also: >> >> >> >> # for Ceph >> >> net.ipv4.ip_forward=0 >> >> net.ipv4.conf.default.rp_filter=1 >> >> kernel.sysrq=0 >> >> kernel.core_uses_pid=1 >> >> net.ipv4.tcp_syncookies=0 >> >> #net.netfilter.nf_conntrack_max=2621440 >> >> #net.netfilter.nf_conntrack_tcp_timeout_established = 1800 >> >> # disable netfilter on bridges >> >> #net.bridge.bridge-nf-call-ip6tables = 0 >> >> #net.bridge.bridge-nf-call-iptables = 0 >> >> #net.bridge.bridge-nf-call-arptables = 0 >> >> vm.min_free_kbytes=1000000 >> >> >> >> # Controls the maximum size of a message, in bytes >> >> kernel.msgmnb = 65536 >> >> >> >> # Controls the default maxmimum size of a mesage queue >> >> kernel.msgmax = 65536 >> >> >> >> # Controls the maximum shared segment size, in bytes >> >> kernel.shmmax = 68719476736 >> >> >> >> # Controls the maximum number of shared memory segments, in pages >> >> kernel.shmall = 4294967296 >> >> >> >> >> >> The ceph.conf file is: >> >> >> >> ... >> >> osd_pool_default_size = 3 >> >> osd_pool_default_min_size = 2 >> >> osd_pool_default_pg_num = 1600 >> >> osd_pool_default_pgp_num = 1600 >> >> >> >> debug_crush = 1/1 >> >> debug_buffer = 0/1 >> >> debug_timer = 0/0 >> >> debug_filer = 0/1 >> >> debug_objecter = 0/1 >> >> debug_rados = 0/5 >> >> debug_rbd = 0/5 >> >> debug_ms = 0/5 >> >> debug_throttle = 1/1 >> >> >> >> debug_journaler = 0/0 >> >> debug_objectcatcher = 0/0 >> >> debug_client = 0/0 >> >> debug_osd = 0/0 >> >> debug_optracker = 0/0 >> >> debug_objclass = 0/0 >> >> debug_journal = 0/0 >> >> debug_filestore = 0/0 >> >> debug_mon = 0/0 >> >> debug_paxos = 0/0 >> >> >> >> osd_crush_chooseleaf_type = 0 >> >> filestore_xattr_use_omap = true >> >> >> >> rbd_cache = true >> >> mon_compact_on_trim = false >> >> >> >> [osd] >> >> osd_crush_update_on_start = false >> >> >> >> [client] >> >> rbd_cache = true >> >> rbd_cache_writethrough_until_flush = true >> >> rbd_default_features = 1 >> >> admin_socket = /var/run/ceph/$cluster-$type.$id.$pid.$cctid.asok >> >> log_file = /var/log/ceph/ >> >> >> >> >> >> The cluster has two production pools on for openstack (volumes) with RF >> of 3 and another pool for db (db) with RF of 2. The DBA team has perform >> several tests with a volume mounted on the DB server (with RBD). The DB >> server has the following configuration: >> >> >> >> OS: CentOS 6.9 | kernel 4.14.1 >> >> DB: MySQL >> >> ProLiant BL685c G7 >> >> 4x AMD Opteron Processor 6376 (total of 64 cores) >> >> 128G RAM >> >> 1x OneConnect 10Gb NIC (quad-port) - in a bond configuration >> (active/active) with 3 vlans >> >> >> >> >> >> >> >> We also did some tests with *sysbench* on different storage types: >> >> >> >> *sysbench* >> >> *disk* >> >> *tps* >> >> *qps* >> >> *latency (ms) 95th percentile* >> >> Local SSD >> >> 261,28 >> >> 5.225,61 >> >> 5,18 >> >> Ceph NVMe >> >> 95,18 >> >> 1.903,53 >> >> 12,3 >> >> Pure Storage >> >> 196,49 >> >> 3.929,71 >> >> 6,32 >> >> NetApp FAS >> >> 189,83 >> >> 3.796,59 >> >> 6,67 >> >> EMC VMAX >> >> 196,14 >> >> 3.922,82 >> >> 6,32 >> >> >> >> >> >> Is there any specific tuning that I can apply to the ceph cluster, in >> order to improve those numbers? Or are those numbers ok for the type and >> size of the cluster that we have? Any advice would be really appreciated. >> >> >> >> Thanks, >> >> >> >> >> >> >> >> *German* >> >> >> >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> Hi, >> >> What is the value of --num-threads (def value is 1) ? Ceph will be better >> with more threads: 32 or 64. >> What is the value of --file-block-size (def 16k) and file-test-mode ? If >> you are using sequential seqwr/seqrd you will be hitting the same OSD, so >> maybe try random (rndrd/rndwr) or better use rbd stripe size of 16kb >> (default rbd stripe is 4M). rbd striping is ideal for small block >> sequential io pattern typical in databases. >> >> /Maged >> >> >> > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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