MySQL and Ceph. A tale of two friends
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1 ysql and Ceph A tale of two friends
2 Karan Singh Sr. Storage Architect Red Hat Taco Scargo Sr. Solution Architect Red Hat
3 Agenda Ceph Introduction and Architecture Why ysql on Ceph ysql and Ceph Performance Tuning Head-to-Head Performance ysql on Ceph vs. AWS Architectural Considerations Where to go next?
4 Quick Poll - Who runs DB workloads on V / Cloud? - Who is familiar with Ceph?
5 Ceph Introduction & Architecture
6 What is Ceph? Open Source Software Defined Storage Solution Unified Storage Platform ( Block, Object and File Storage ) Runs on Commodity Hardware Self anaging, Self Healing assively Scalable No Single Point of failure
7 Ceph : Under the hood
8 Architectural Components OB JE CT S VIRTUA L DISKS FILES YSTE RGW RBD CEPHFS A web services gateway for object storage, compatible with S3 and Swift A reliable, fully-distributed block device with cloud platform integration A distributed file system with POSIX semantics and scale-out metadata LIBRADOS A library allowing apps to directly access RADOS (C, C++, Java, Python, Ruby, PHP) RADOS A software-based, reliable, autonomous, distributed object store comprised of self-healing, self-managing, intelligent storage nodes and lightweight monitors
9 RADOS Components OSDs ( Object Storage Daemon ) s to 000s in a cluster Typically one daemon per disk Stores actual data on disk Intelligently peer for replication & recovery onitors aintain cluster membership and health Provide consensus for distributed decision-making Small, odd number Do not store data
10 Ceph OSDs OSD OSD OSD OSD XFS XFS XFS XFS DISK DISK DISK DISK
11 RADOS cluster a.k.a Ceph cluster APPLICATION RADOS CLUSTER
12 How to access the cluster? APPLICATION OBJECTS??
13 CRUSH Algorithm Controller Replication Under Scalable Hashing OBJECTS 11 PLACEENT GROUPS (PGs) CLUSTE R
14 Data is organized into pools OBJECTS OBJECTS OBJECTS OBJECTS POOL A POOL B POOL C POOL D POOLS (CONTAINING PGs) CLUSTE R
15 Ceph Access ethods
16 ARCHITECTURAL COPONENTS AP P HOST/V CLIEN T RGW RBD CEPHFS A web services gateway for object storage, compatible with S3 and Swift A reliable, fully-distributed block device with cloud platform integration A distributed file system with POSIX semantics and scale-out metadata LIBRADOS A library allowing apps to directly access RADOS (C, C++, Java, Python, Ruby, PHP) RADOS A software-based, reliable, autonomous, distributed object store comprised of self-healing, self-managing, intelligent storage nodes and lightweight monitors
17 ARCHITECTURAL COPONENTS AP P HOST/V CLIEN T RGW RBD CEPHFS A web services gateway for object storage, compatible with S3 and Swift A reliable, fully-distributed block device with cloud platform integration A distributed file system with POSIX semantics and scale-out metadata LIBRADOS A library allowing apps to directly access RADOS (C, C++, Java, Python, Ruby, PHP) RADOS A software-based, reliable, autonomous, distributed object store comprised of self-healing, self-managing, intelligent storage nodes and lightweight monitors
18 STORING VIRTUAL DISKS V HYPERVISOR LIBRBD RADOS CLUSTER
19 VIRTUAL ACHINE LIVE IGRATION HYPERVISOR HYPERVISOR V LIBRBD LIBRBD RADOS CLUSTER
20 PERSISTENT STORGE FOR CONTAINERS CONTAINER HOST KRBD RADOS CLUSTER
21 PERCONA SERVER ON KRBD CONTAINER HOST KRBD RADOS CLUSTER
22 Why ysql on Ceph
23 Why ysql on Ceph? ARKET DRIVERS Ceph #1 block storage for OpenStack ysql #4 workload on OpenStack (#1-3 often use database too!) 70% apps use LAP on OpenStack ysql leading open-source RDBS Ceph leading open-source SDS
24 Why ysql on Ceph? OPS EFFICIENCY DRIVERS Distributed, elastic storage pools on commodity servers Dynamic data placement Flexible volume resizing Live instance migration Pool and volume snapshot Read replicas via copy-on-write snapshots Familiar environment like public clouds
25 Why ysql on Ceph? Database Requires HIGH IOPS Workload edia Access ethod General Purpose Spinning/SSD Block Capacity ( $/GB ) Spinning Object High IOPS ( $/IOPS ) SSD / NVe Block
26 ysql and Ceph : Performance Tuning
27 Tuning for Harmony Tuning ysql Tuning Ceph Buffer pool > 20% RHCS 1.3.2, tcmalloc 2.4, 128 thread cache Flush each Transaction or batch? If ( OSDs on Flash media) ; then Percona Parallel double write buffer feature Co-resident journals 2-4 OSDs per SSD/NVe If ( OSDs on agnetic media ) ; then SSD Journals RAID write back cache RBD cache Software cache
28 Tuning for Harmony Effect of ysql Buffer Pool On TpmC
29 Tuning for Harmony Effect of ysql Tx flush on TpmC
30 Tuning for Harmony Creating a separate pool to serve IOPS workload Creating multiple pools in the CRUSH map Distinct branch in OSD tree Edit CRUSH map, add SSD rules Create pool, set crush_ruleset to SSD rule If storage provisioning using OpenStack ; then Add volume type to Cinder If! OpenStack ; then Provision database storage volumes from SSD pool
31 Head to Head Performance ysql on Ceph vs. ysql on AWS 30 IOPS/GB: AWS EBS P-IOPS TARGET
32 Head-To-Head LAB Test Environment EC2 r3.2xlarge and m4.4xlarge Supermicro servers EBS Provisioned IOPS and GPSSD Red Hat Ceph Storage RBD Percona Server Percona Server
33 SUPERICRO Ceph Cluster Lab Environment Shared G SFP+ Networking 5x OSD Nodes Ceph OSD Nodes 5x SuperStorage SSG-6028R-OSDXXX Dual Intel Xeon E5-2650v3 (x core) 32GB SDRA DDR3 2x 80GB boot drives 4x 800GB Intel DC P3700 (hot-swap U.2 NVe) 1x dual port GbE network adaptors AOC-STGN-i2S 8x Seagate 6TB 7200 RP SAS (unused in this lab) ellanox 40GbE network adaptor(unused in this lab) onitor Nodes ysql Client Nodes 12x Super Server 2UTwin2 nodes Dual Intel Xeon E5-2670v2 (cpuset limited to 8 or 16 vcpus) 64GB SDRA DDR3 12x Client Nodes Storage Server Software: Red Hat Ceph Storage Red Hat Enterprise Linux 7.2 Percona Server
34 IOPS/GB per ysql Instance
35 Focusing on Write IOPS/GB AWS does throttling to serve deterministic performance
36 Effect of Ceph cluster loading on IOPS/GB
37 HEAD-TO-HEAD: ysql on Ceph vs. AWS
38 $/STORAGE-IOP
39 Architectural Considerations
40 Architectural Considerations Understanding the workloads Traditional Ceph Workload ysql Ceph Workload $/GB $/IOP PBs TBs Unstructured data Structured data B/sec IOPS
41 Architectural Considerations Fundamentally Different Design Traditional Ceph Workload ysql Ceph Workload TB per server < TB per server agnetic edia (HDD) Flash (SSD -> NVe) Low CPU-core:OSD ratio High CPU-core:OSD ratio GbE->40GbE GbE
42 Considering CPU Core to Flash Ratio
43 SUPERICRO ICRO CLOUD CEPH YSQL PERFORANCE SKU 1x CPU + 1x NVe + 1x SFP + 8x Nodes in 3U chassis odel: SYS-5038R-OSDXXXP + Per Node Configuration: CPU: Single Intel Xeon E v4 emory: 32GB NVe Storage: Single 800GB Intel P3700 Networking: 1x dual-port G SFP+
44 Where to go Next?
45 ysql on Red Hat Ceph Storage Reference Architecture White Paper Download the PDF
46 Red Hat Ceph Storage Test Drive Learning by Doing Absolutely Free Ceph playground Node Ceph Lab on AWS Self paced, instruction led
47 Thank You Ceph Test Drive: ysql on Ceph Reference Arch: Join us to hear about ysql and Red Hat Storage Free Test Drive Environment Today 3:40 P, Room : Lausanne
48 How to access the cluster?
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