Multiple Target PPRC with IBM DS8870 Session 17839

Transcription

1 Multiple Target PPRC with IBM DS8870 Session Warren Stanley DS8000 Copy Services IBM Systems Division August 13, 2015

2 Agenda Multiple Target Topologies Multiple Target Incremental Resynchronization Failure Recovery Scenarios Command and Interface changes Software Support Migration using Multiple Target Metro Global Mirror (MGM) Topologies Additional Topologies 2

3 Multiple Target PPRC A volume is the source for two separate relationships. Multiple Target Two Synchronous relationships Limited Availability in Release 7.27 Additional topologies Both synchronous and asynchronous replication General Availability in Release 7.4 Global 3

4 Topologies Two Synchronous Synchronous + Asynchronous Global Mirror/Global Copy Two Asynchronous Global Mirror and Global Copy But not two Global Mirror Multiple Target with MGM or Mz/GM 4

5 Multiple Target 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 Multiple Target restored after remote site is recovered 5

6 Restore Mirroring after HyperSwap Mirroring restored after a HyperSwap Incremental Resync used to quickly restore mirroring 6

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

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 Out of sync percentage may be queried Internal IR Pair Change Recording 8

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. 9

10 Creating a Multiple Target PPRC Topology Establish first pair Establish second pair Internal pairs are automatically created If pair removed Internal pairs also removed 10

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 11

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

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 13

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 Multiple Target Otherwise, no changes Query commands Display multiple relationships on a volume Display both normal and internal pairs Global Mirror Join Session 14

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 15

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* 16

17 TPC-R 17

18 Migration Multiple Target 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 18

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

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 20

21 RPQ For Migration Multiple Target PPRC requires that all DS8870s have the Multiple Target PPRC support DS8800 RPQ available for migration purposes Allows the secondary storage controllers to be earlier DS8000 models Primary must be DS8870 with Multiple Target PPRC support DS8870 DS

22 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 22

23 Metro Global Mirror - Cascaded Local HyperSwap capability Asynchronous replication Out of region DR capability Global Mirror J3 23

24 Metro Global Mirror Multiple Target Local HyperSwap capability Asynchronous replication Out of region DR capability Global Mirror J3 24

25 Cascaded to Multiple Target Conversion HyperSwap to Failover Move I/O to Failback Internal pairs created Global Mirror J3 25

26 Multiple Target to Cascaded Conversion Failover Failback Global Copy Start Global Mirror Delete Global Mirror Copy Global Mirror J3 26

27 MGM Cascaded Improvement Multiple Target simplifies MGM Cascaded scenario Failure at HyperSwap to Failover Move I/O to When is recovered Failback HyperSwap back to Failback Global Mirror Global Mirror to runs throughout J3 27

28 HyperSwap with MGM - Multiple Target 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 Multiple Target restored J3 28

29 Asynchronous 3-Site Topology Two Asynchronous Copies One Global Mirror One Global Copy Each site in a different region Global Mirror J2 Global Copy 29

30 Asynchronous 3-Site failure Failure at (GC Secondary) Global Mirror remains active Disaster Recovery capability maintained Global Mirror J2 When recovered Resume Global Copy 30

31 Asynchronous 3-Site failure Failure at (GM Secondary) Convert Global Copy to Global Mirror J2 Disaster Recovery capability restored Global Mirror Copy When recovered Resume, Global Copy Global Copy Mirror J3 31

32 Asynchronous 3-Site failure Failure at Recover at DR site Failback Global Copy Start Global Mirror for Global Mirror Copy J2 When is recovered Failback Global Copy Mirror Global Copy J3 32

33 MGM + Multiple Target Global Mirror J3 H4 33

34 Mz/GM z/global Mirror SDM 34

35 Mz/GM with Multiple Target z/global Mirror SDM H4 35

36 Response Time (ms) Multiple Target Performance 4KB Writes Multiple Target Single Target No Mirror 0 20,000 40,000 60,000 80, , , , , ,000 IOps No Mirroring Single Multi-target 36

37 Response Time (ms) Multiple Target Performance 27KB Writes Multiple Target Single Target No Mirror ,000 40,000 60,000 80, , , ,000 IOps No Mirroring Single Multi-target 37

38 Further Information IBM DS8870 Multiple Target Peer-to-Peer Remote Copy, REDP

39 Summary Multiple Target Topologies Multiple Target Incremental Resync Failure Recovery Scenarios Command and Interface changes Software Support Migration using Multiple Target Metro Global Mirror (MGM) Topologies Additional Topologies 39