Multiple Target Mirroring with IBM DS8870

Transcription

1 Multiple Target Mirroring with IBM DS8870 Lisa Gundy DFSMS Copy Services Architect IBM Systems Division Insert Custom Session QR if Desired.

2 Session Agenda MultiTarget Topologies MultiTarget Incremental Resync Failure Recovery Scenarios Remote Pair FlashCopy Command and Interface changes Software Support Migration using MultiTarget Metro Global Mirror (MGM) Topologies Additional Topologies Copyright IBM Corporation

3 MultiTarget PPRC Single volume is the source for two separate relationships. MultiTarget Two Synchronous relationships Limited Availability in Release 7.27 General Availability in Release 7.40 Copyright IBM Corporation

4 Topologies Two Synchronous Synchronous + Asynchronous Global Mirror Two Asynchronous MultiTarget with MGM or Mz/GM Copyright IBM Corporation

5 MultiTarget Data is transferred to both targets in parallel Pairs operate independently of each other Pairs may be established, suspended or removed separately HyperSwap capability is maintained MultiTarget restored after remote site is recovered Copyright IBM Corporation

6 Restore Mirroring after HyperSwap Mirroring restored after a HyperSwap Copyright IBM Corporation

7 Internal Incremental Resync Pairs Automatically created in a MultiTarget topology Are converted into active pairs when needed Track the data difference between the remote volumes Internal IR Pairs Copyright IBM Corporation

8 Change Recording with Internal Pairs Internal Pairs have a Change Recording structure Information added as writes are received Information deleted after update to the partner volume is confirmed When internal pairs are synchronized, only the changed data is copied Internal IR Pair Out of sync percentage may be queried Change Recording Copyright IBM Corporation

9 Resynchronization Using IR Pairs The Internal IR pairs are synchronized using the existing Failback command. The Change Recording structures for and are merged and only the changed data is transferred. Copyright IBM Corporation

10 Creating a MultiTarget Topology Establish first pair Establish second pair Internal pairs are automatically created If pair removed Internal pairs also removed Copyright IBM Corporation

11 Recovery After failure Failure at HyperSwap to Failover Move I/O to Resume with Incremental Resync Failover Failback Mirroring is quickly resumed Site recovered Failback Copyright IBM Corporation

12 Return to HyperSwap to Failover Move I/O to Resume and pairs. Failover Failback Failback Copyright IBM Corporation

13 Remote Pair FlashCopy FlashCopy mirrored to one of the secondary volumes. New command to Set/Reset Use Remote Pair FlashCopy for a PPRC pair. S 2 T 2 FlashCopy S 1 T 1 / Global Copy S 3 T 3 Copyright IBM Corporation

14 Command Modifications Changes to Establish Pair command None Changes to Suspend, Terminate, Freeze, etc None Changes to Failover / Failback commands New option on Failover to convert to MultiTarget Otherwise, no changes Query commands Display multiple relationships on a volume Display both normal and internal pairs Global Mirror Join Session Copyright IBM Corporation

15 dscli dscli> lspprc 0003 Date/Time: September 12, :09:22 PM MDT IBM DSCLI Version: DS: IBM LD581 ID State Reason Type SourceLSS Timeout (secs) Critical Mode First Pass Status ================================================================================================== 0003:0103 Full Duplex Disabled Invalid 0003:0203 Full Duplex Disabled Invalid dscli> lspprc 0103 Date/Time: September 12, :09:48 PM MDT IBM DSCLI Version: DS: IBM LD581 ID State Reason Type SourceLSS Timeout (secs) Critical Mode First Pass Status ========================================================================================================= 0003:0103 Target Full Duplex Disabled Invalid dscli> lspprc -multtgt 0103 Date/Time: September 12, :09:57 PM MDT IBM DSCLI Version: DS: IBM LD581 ID State Reason Type SourceLSS Timeout (secs) Critical Mode First Pass Status ======================================================================================================================== 0003:0103 Target Full Duplex Disabled Invalid 0103:0203 Suspended Multi-target Internal Global Copy Disabled True Copyright IBM Corporation

16 TSO ANTP0090I CQUERY FORMATTED LVL 6 VOLUME REPORT ************** PPRC REMOTE COPY CQUERY - VOLUME ******************** * (PRIMARY) (SECONDARY) * * SSID CCA LSS SSID CCA LSS* *DEVICE LEVEL STATE PATH STATUS SERIAL# SERIAL# * * * * 0F51 PRIMARY.. DUPLEX... ACTIVE.. D D * * SCH(0) CRIT(NO)... CGRPLB(YES) CRB CRB31* * INCRES(NO). AUTORESYNC(NO). * *THIS PAIR HAS BEEN IDENTIFIED TO BE USED FOR PRESERVE MIRROR. * * PATHS PFCA SFCA STATUS: DESCRIPTION * * * * PATH ESTABLISHED... * * NO PATH... * * NO PATH... * * NO PATH... * * SUBSYSTEM WWNN LIC LEVEL * * * * PRIMARY FFD70E * * SECONDARY FFD70C * * SECONDARY FFD710 * ******************************************************************** VOLUME REPORT ************** PPRC REMOTE COPY CQUERY - VOLUME ******************** * (PRIMARY) (SECONDARY) * * SSID CCA LSS SSID CCA LSS* *DEVICE LEVEL STATE PATH STATUS SERIAL# SERIAL# * * * * 0F51 PRIMARY.. DUPLEX... ACTIVE.. D D * * SCH(0) CRIT(NO)... CGRPLB(YES) CRB CRB71* Copyright IBM Corporation

17 TPC-R Copyright IBM Corporation

18 Migration MultiTarget simplifies migrations Data may be mirrored to new DS8870 while maintaining the current mirror No need to remove current mirror until after the new mirror is in place Copyright IBM Corporation

19 Migration Secondary Starting with an existing pair Install new secondary Start for Wait for to reach Full Duplex Terminate Remove original Copyright IBM Corporation

20 Migration Primary Starting with an existing pair Install new Start for Wait for to reach Full Duplex HyperSwap to Resume, using Incremental Resync Terminate relationships on and remove it Copyright IBM Corporation

21 Global Mirror Asynchronous replication Out of region Disaster Recovery capability In the event an outage, production may be restarted at the remote recovery site Global Mirror J2 Copyright IBM Corporation

22 Metro Global Mirror - Cascaded Local HyperSwap capability Asynchronous replication Out of region DR capability Global Mirror J3 Copyright IBM Corporation

23 Metro Global Mirror - MultiTarget Local HyperSwap capability Asynchronous replication Out of region DR capability Global Mirror J3 Copyright IBM Corporation

24 Cascaded to MultiTarget Conversion HyperSwap to Failover Move I/O to Failback Internal pairs created Global Mirror J3 Copyright IBM Corporation

25 MultiTarget to Cascaded Conversion Failover Failback Global Copy Start Global Mirror Delete Global Copy Mirror Global Mirror J3 Copyright IBM Corporation

26 MGM Cascaded Improvement MultiTarget simplifies MGM Cascaded scenario Failure at HyperSwap to Failover Move I/O to When is recovered Failback Global Mirror HyperSwap back to Failback Global Mirror to runs throughout J3 Copyright IBM Corporation

27 HyperSwap with MGM - MultiTarget Asynchronous replication Out of region DR capability HyperSwap capability Failure at HyperSwap to Incremental Resync Global Copy Start Global Mirror Global Mirror Copy When is recovered Failback Global Mirror MultiTarget restored J3 Copyright IBM Corporation

28 Symmetrical 3-Site Configuration Two Asynchronous Copies One Global Mirror One Global Copy Each site in a different region Global Mirror J2 Global Copy Copyright IBM Corporation

29 Symmetrical 3-Site failure Failure at (GC Secondary) Global Mirror remains active Global Mirror J2 Disaster Recovery capability maintained When recovered Resume Global Copy Copyright IBM Corporation

30 Symmetrical 3-Site failure Failure at (GM Secondary) Convert Global Copy to Global Mirror Global Mirror Copy J2 Disaster Recovery capability restored When recovered Resume, Global Copy Global Copy Mirror J3 Copyright IBM Corporation

31 Symmetrical 3-Site failure Failure at Recover at DR site Failback Global Copy Global Mirror Copy J2 Start Global Mirror for Global Copy Mirror When is recovered Failback Global Copy J3 Copyright IBM Corporation

32 MGM + MultiTarget Global Mirror J3 H4 Copyright IBM Corporation

33 Mz/GM z/global Mirror SDM Copyright IBM Corporation

34 Mz/GM with MultiTarget z/global Mirror SDM H4 Copyright IBM Corporation

35 Session Summary MultiTarget Topologies MultiTarget Incremental Resync Failure Recovery Scenarios Remote Pair FlashCopy Command and Interface changes Software Support Migration using MultiTarget Metro Global Mirror (MGM) Topologies Additional Topologies Copyright IBM Corporation