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DB2 Pure Scale Webcast
1.
ibm.com/db2/pureScale DB2 pureScale :
A Technology Overview Matt Huras, IBM. 1 © 2009 IBM Corporation
2.
Agenda
Introduction Goals & Value Propositions Technology Overview Technology In-Depth Key Concepts & Internals Efficient scaling Failure modes & recovery automation Stealth Maintenance Client Configuration & Solution Packaging Client configuration and load balancing Solution Packaging 2 © 2009 IBM Corporation
3.
DB2 pureScale :
Goals Unlimited Capacity Any transaction processing or ERP workload Start small Grow easily, with your business Application Transparency Avoid the risk and cost of tuning your applications to the database topology Continuous Availability Maintain service across planned and unplanned events 3 © 2009 IBM Corporation
4.
DB2 pureScale :
Technology Overview Leverage IBM’s System z Sysplex Experience and Know-How Clients Clients connect anywhere,… … see single database Clients connect into any member Automatic load balancing and client reroute may change underlying physical member to which client is connected Single Database View DB2 engine runs on several host computers Co-operate with each other to provide coherent access to the database from any member Member Member Member Member Integrated cluster services CS CS CS CS Failure detection, recovery automation, cluster file system In partnership with STG (GPFS,RSCT) and Tivoli (SA MP) Low latency, high speed interconnect Cluster Interconnect Special optimizations provide significant advantages on RDMA- capable interconnects (eg. Infiniband) CS CS 2nd-ary Log Log Log Log Primary PowerHA pureScale technology from STG Efficient global locking and buffer management Shared Storage Access Synchronous duplexing to secondary ensures availability Database Data sharing architecture Shared access to database Members write to their own logs Logs accessible from another host (for recovery) 4 © 2009 IBM Corporation
5.
Scale with Ease
Without changing applications Efficient coherency protocols designed to scale without Single Database View application change Applications automatically and transparently workload balanced across members Without administrative DB2 DB2 DB2 DB2 DB2 complexity No data redistribution required Log Log Log Log Log To 128 members in initial release 5 © 2009 IBM Corporation
6.
Online Recovery
DB2 DB2 DB2 DB2 A key DB2 pureScale design point is to maximize availability during failure recovery processing Log Log Log Log When a database member fails, only data in-flight on the failed member remains locked during the Database member failure automated recovery Only data in-flight updates locked during recovery In-flight = data being updated on the member % of Data Available at the time it failed 100 50 Time (~seconds) 6 © 2009 IBM Corporation
7.
Stealth System Maintenance
Goal: allow DBAs to apply Single Database View system maintenance without negotiating an outage window Procedure: DB2 DB2 DB2 DB2 Drain (aka Quiesce) Remove & Maintain Re-integrate Log Log Log Log Repeat until done 7 © 2009 IBM Corporation
8.
Agenda
Introduction Goals & Value Propositions Technology Overview Technology In-Depth Key Concepts & Internals Efficient scaling Failure modes & recovery automation Stealth Maintenance Client Configuration & Solution Packaging Client configuration and load balancing Solution Packaging 8 © 2009 IBM Corporation
9.
What is a
Member ? Member 0 Member 1 db2sysc process db2sysc process db2 agents & other db2 agents & other A DB2 engine address space threads threads i.e. a db2sysc process and its threads Members Share Data log buffer, log buffer, dbheap, & dbheap, & All members access the same shared database other heaps other heaps Aka “Data Sharing” bufferpool(s) bufferpool(s) Each member has it’s own … Bufferpools Memory regions Log files Log Log Members are logical. Can have … 1 per machine or LPAR (recommended) Shared database >1 per machine or LPAR (not recommended) (Single database partition) 9 © 2009 IBM Corporation
10.
What is PowerHA
pureScale ? db2 agents & other db2 agents & other Software technology that assists threads threads in global buffer coherency management and global locking Derived from System z Parallel Sysplex & Coupling Facility technology log buffer, log buffer, dbheap, & dbheap, & Software based other heaps other heaps Services provided include bufferpool(s) bufferpool(s) Group Bufferpool (GBP) Global Lock Management (GLM) Shared Communication Area (SCA) Primary Log Log Members duplex GBP, GLM, GBP GLM SCA SCA state to both a primary and secondary Secondary Done synchronously Duplexing is optional (but recommended) Set up automatically, by default Shared database (Single database partition) 10 © 2009 IBM Corporation
11.
Achieving Efficient Scaling
: Key Design Points Deep RDMA exploitation over low latency fabric Lock Mgr Lock Mgr Lock Mgr Lock Mgr Enables round-trip response time ~10-15 microseconds Buffer Mgr Silent Invalidation Informs members of page updates requires no CPU cycles on those Ca n members Yu e Ih ag p, av dP h e No interrupt or other message er Ne th a e Re is w yo processing required loc pa u ge k? ar e. Increasingly important as cluster im ag grows e GBP GLM SCA Hot pages available without disk I/O from GBP memory RDMA and dedicated threads enable read page operations in ~10s of microseconds 11 © 2009 IBM Corporation
12.
Scalability : Example
Clients (2-way x345) Transaction processing workload modeling warehouse & ordering process 1Gb Ethernet Write transactions rate to 20% Client Typical read/write ratio of many OLTP Connectivity p550 workloads p550 powerHA pureScale members No cluster awareness in the application No affinity 20Gb IB No partitioning pureScale No routing of transactions to members Interconnect Testing key DB2 pureScale design point 7874-024 Switch Configuration 12 8-core p550 members Two 4Gb FC 64 GB, 5 GHz each Switches Duplexed PowerHA pureScale across 2 additional 8-core p550s 64 GB, 5 GHz each DS8300 storage 576 15K disks, Two 4Gb FC Switches DS8300 IBM 20Gb/s IB HCAs Storage 7874-024 IB Switch 12 © 2009 IBM Corporation
13.
Scalability : Example
12 11 10.4x @ 12 members Throughput vs 1 member 10 9 8 7.6x @ 8 members 7 6 5 4 3.9x @ 4 members 3 2 1.98x @ 2 members 1 0 0 5 10 15 # Members 13 © 2009 IBM Corporation
14.
Member HW Failure
: “Member Restart on Guest Host (aka Restart Light)” Power cord tripped over accidentally DB2 Cluster Services looses heartbeat and Clients declares member down Informs other members & PowerHA pureScale servers Fences member from logs and data Initiates automated member restart on another (“guest”) host Using reduced, and pre-allocated memory model Single Database View Member restart is like a database crash recovery in a single system database, but is much faster • Redo limited to inflight transactions (due to FAC) • Automatic; Benefits from page cache in PowerHA pureScale In the mean-time, client connections are Fast; Ultra automatically re-routed to healthy members DB2 DB2 DB2 Based on least load (by default), or, DB2 Pre-designated failover member Online CS CS CS Fe nc e DB2 CS Other members remain fully available throughout – “Online Failover” Lo g R ec Log Log Log Log s Primary retains update locks held by member at the Pa ge time of failure CS s CS Other members can continue to read and update data Updated Pages Updated Pages Global Locks Global Locks not locked for write access by failed member Shared Data Secondary Primary Member restart completes Retained locks released and all data fully available 14 © 2009 IBM Corporation
15.
Member Failback
Clients Power restored and system re-booted Single Database View DB2 Cluster Services automatically detects system availability Informs other members and PowerHA pureScale servers Removes fence Brings up member on home host DB2 DB2 DB2 DB2 CS CS CS CS DB2 Client connections automatically re-routed back to member Log Log Log Log CS CS Updated Pages Updated Pages Global Locks Global Locks Shared Data Secondary Primary 15 © 2009 IBM Corporation
16.
Primary PowerHA pureScale
Failure Clients Power cord tripped over accidentally DB2 Cluster Services looses heartbeat Single Database View and declares primary down Informs members and secondary PowerHA pureScale service momentarily blocked Automatic; All other database activity proceeds normally Eg. accessing pages in bufferpool, existing locks, sorting, aggregation, etc Ultra Fast; DB2 DB2 DB2 DB2 Members send missing data to Online CS CS CS CS secondary Eg. read locks Log Log Log Log CS CS Updated Pages Updated Pages Secondary becomes primary Global Locks Shared Data Global Locks PowerHA pureScale service continues where Secondary Primary it left off Primary No errors are returned to DB2 members 16 © 2009 IBM Corporation
17.
Summary (Single Failures)
Other Members Remain Automatic & Failure Mode Online ? Transparent ? DB2 DB2 DB2 DB2 Member CF CF Connections to failed member transparently move to another member Primary PowerHA DB2 DB2 DB2 DB2 pureScale CF CF Secondary PowerHA DB2 DB2 DB2 DB2 pureScale CF CF 17 © 2009 IBM Corporation
18.
Simultaneous Failures
Other Members Remain Automatic & Failure Mode Online ? Transparent ? DB2 DB2 DB2 DB2 CF CF Connections to failed member transparently move to another member DB2 DB2 DB2 DB2 CF CF Connections to failed member transparently move to another member DB2 DB2 DB2 DB2 CF CF Connections to failed member transparently move to another member 18 © 2009 IBM Corporation
19.
“Stealth” Maintenance :
Example Ensure automatic load balancing is enabled (it is by default) Single Database View db2stop member 3 quiesce db2stop instance on host <hostname> Perform desired maintenance DB2 DB2 DB2 DB2 eg. install AIX PTF db2start instance on host <hostname> Log Log Log Log db2start member 3 19 © 2009 IBM Corporation
20.
Agenda
Introduction Goals & Value Propositions Technology Overview Technology In-Depth Key Concepts & Internals Efficient scaling Failure modes & recovery automation Stealth Maintenance Client Configuration & Solution Packaging Client configuration and load balancing Solution Packaging 20 © 2009 IBM Corporation
21.
Client Connectivity and
Workload Balancing Run-time load information used to automatically balance load across the cluster (as in System z sysplex) Load information of all members kept on each member Piggy-backed to clients regularly Used to route next connection (or optionally next transaction) to least loaded member Routing occurs automatically (transparent to application) Failover Load of failed member evenly distributed to surviving members automatically Fallback Once the failed member is back online, fallback does the reverse Clients Clients 21 © 2009 IBM Corporation
22.
Optional Affinity-based Routing
App Servers App Servers App Servers App Servers Group A Group B Group C Group D Allows you to target different groups of clients or workloads to different members in the cluster Maintained after failover … … and fallback Example use cases Consolidate separate workloads/applications on same database infrastructure Minimize total resource requirements for disjoint workloads Easily configured through client configuration db2dsdriver.cfg file 22 © 2009 IBM Corporation
23.
DB2 pureScale :
A Complete Solution Clients Single Database View DB2 pureScale is a complete software solution Comprised of tightly integrated subcomponents Member Member Member Member CS CS CS CS Single install invocation Installs all components across desired Cluster Interconnect hosts Automatically configures best practices CS CS Log Log Log Log No cluster manager scripting Shared Storage Access or configuration required This is set up automatically, upon Database installation 23 © 2009 IBM Corporation
24.
DB2 pureScale Unlimited
Capacity Start small Grow easily, with your business Application Transparency Avoid the risk and cost of tuning your applications to the database topology Continuous Availability Maintain service across planned and unplanned events 24 © 2009 IBM Corporation
25.
> Questions 25
25 © 2009 IBM Corporation
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