[ceph-users] ceph all-nvme mysql performance tuning

Luis Periquito periquito at gmail.com
Tue Nov 28 01:36:27 PST 2017


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 <ganders at 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 <nick at fisk.me.uk>:
>
>> *From:* ceph-users [mailto:ceph-users-bounces at lists.ceph.com] *On Behalf
>> Of *German Anders
>> *Sent:* 27 November 2017 14:44
>> *To:* Maged Mokhtar <mmokhtar at petasan.org>
>> *Cc:* ceph-users <ceph-users at 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 <mmokhtar at 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 at 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 at lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20171128/26a33428/attachment.html>


More information about the ceph-users mailing list