Copyright 2018 Dell Inc.

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2 PowerMax VMAX ACTIVE-ACTIVE STORAGE FOR APPLICATIONS USING SRDF/METRO Bhavin Patel, Product Management Mike Adams, VMAX Engineering

3 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 3

4 SRDF: The gold standard in replication & high availability SUPPORTS THE WORLD S MOST MISSION CRITICAL APPLICATIONS AT SCALE WIDE RANGE OF USE CASES: HIGH AVAILABILITY, DISASTER RECOVERY, MOBILITY 25+ YEARS OF EXPERIENCE AND MATURITY; PROVEN AT GLOBAL DISTANCES +12K KMs HIGH PENETRATION RATE (FINANCIAL INSTITUTIONS, TELECOM & IT SERVICE PROVIDERS, HEALTHCARE, GOVERNMENT AGENCIES) 4

5 Three decades of SRDF innovation 1990s 2000s 2010s SRDF/S SRDF/AR (aka SAR) SRDF/A MSC Cascaded SRDF, GDDR* SRDF/Metro SRDF CG SRDF/A SRDF/STAR, AutoSwap* SRDF/SQAR* SRDF/Metro w/ Async DR *Mainframe 5

6 SRDF has three main modes of operation SYNCHRONOUS METRO Witness ASYNCHRONOUS Zero data loss High performance Scalable consistency Up to 100km Up to 100km Active-Active 0 RPO & 0 RTO No failover/back needed Today s session Unlimited Distance Extended distance Multi-cycle mode Remote link resiliency

7 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 7

8 SRDF/Metro provides active-active storage for apps STRETCHED CLUSTERS Provides active-active or high availability storage solution at metro distances Presents same volume identity (WWN) from both arrays in the pair to application cluster Leverages multipathing software to drive application IO to arrays in the pair 100 km Broad OS+MPIO+Cluster support matrix License included in FX and Pro software package 8

9 SRDF/Metro functional capabilities Core capabilities High Availability (HA) metro region with distributed LUN SRDF/A DR site integration SnapVX interoperability Online add device support (empty devices) Move device / Add device with data support (new*) VAAI ATS, UNMAP, WRITESAME, XCOPY Connectivity capabilities FC and iscsi host-array connectivity FC and GigE array-array (SRDF) connectivity Witness capabilities HA resiliency using witness with fallback to bias Virtual witness and array-based witness options Intelligent virtual and array-based witness (new*) Host support capabilities Single node or clustered node setups Uniform and non-uniform topologies Boot from SAN SCSI-2, SCSI-3 and PowerPath clusters Solaris OS with MPxIO support (new*) * on PowerMax and VMAX All Flash arrays running 5978 CY Q2 18 release 9

10 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 10

11 SRDF/Metro use cases Active-Active Clusters Active-Passive Clusters Data Migration Stretch host clusters across metro distances Active-Passive host clusters without any storage intervention Online data migrations 11

12 SRDF/Metro benefits Technology Benefits Business Benefits Highly available no failover/back needed Zero RPO, Zero RTO; no app restart reqd. Out of region protection via Async DR Reduced TCO for high availability Multiple witness options for resiliency Increased use of host assets 12

13 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 13

14 Traditional SRDF functionality Active, remote mirroring SRDF solutions traditionally use active, remote mirroring to create consistent copies of data More specifically, SRDF synchronous (SRDF/S) mode maintains a real-time mirror with a paired array With SRDF/S, writes are only acknowledged to the production host when they have been successfully written to both the local and remote array 14

15 Traditional SRDF functionality SRDF device pairs An SRDF device is essentially a logical device pair R1 devices are members of the device pair at the source (Production) site R1 devices are generally Read/Write accessible to the host R2 devices are members of the device pair at the target (Disaster Recovery) site R2 devices are typically in Read Only mode (Write Disabled) Also various topology combinations, R11, R21, etc. 15

16 Traditional SRDF functionality Host accessible device states Read/Write R1 R2 Read Only Write Disabled To access the R2 device of a traditional SRDF relationship, a manual split, failover, or swap is typically required to write enable the R2 device to accept host writes Previously, Cluster Enabler (SRDF/CE) has also been used for this purpose SRDF Links 16

17 Introduction to SRDF/Metro New device pair states With SRDF/Metro, the SRDF R2 device will now also be Read/Write accessible to the host With both the R1 and R2 devices being accessible, the host (or hosts in the case of a cluster) may now write to both R1 and R2 devices R2 will take on the External Identity of the paired R1 device (geometry, device WWN, serial, reservations, etc.) Includes device attributes standard Multi-Pathing software (MPIOs) will utilize to identify a device across multiple paths 17

18 Introduction to SRDF/Metro Consistency, single & clustered hosts SRDF/Metro ensures that each copy remains current, consistent, and addresses any write conflicts between the paired devices Host I/Os might be issued by a single host, with multi-pathing software directing them to one side or the other of the SRDF device pair Alternatively, the host I/Os might be issued by different hosts accessing the SRDF device pair in a clustered environment 18

19 Introduction to SRDF/Metro SRDF/Metro examples Single Host Multi-Pathing software Host Cluster Read/Write Active-Active Read/Write Read/Write Active-Active Read/Write SRDF/Metro SRDF/Metro R1 R2 R1 R2 R2 19

20 Broad support matrix 20 (Note: SRDF/Metro Support Matrix is 18+ pages long )

21 SRDF/Metro resiliency Bias and Witness functionality SRDF/Metro supports two resiliency features which work together to protect your production environment should issues arise: Witness resiliency allows an array or software-based witness to monitor the state of the SRDF/Metro configuration and facilitate the appropriate action to ensure continued device availability to hosts Bias is a low level microcode feature which prevents data inconsistencies between the two sides of the SRDF device pair and avoids split-brain related complications 21

22 SRDF/Metro resiliency Introduction to Witness functionality A configured witness acts as a cluster quorum device available to both arrays of an SRDF/Metro configuration: Each witness is a repository for configuration state and status information such as device status, link states, and array component availability Should an availability issue occur, each array will utilize this information to best determine continued device availability to the host environment When SRDF/Metro has been configured with witness protection, a device pair state of ActiveActive will result 22

23 SRDF/Metro resiliency Virtual and array based witness functionality Virtual Witness (vwitness) is packaged as a VMware ESXi server virtual appliance (vapp) with IP connectivity to each paired array Two vwitness vapp options are available: Solutions Enabler (recommended for just vwitness) Unisphere (where GUI management is also required) Array witness requires a 3 rd VMAX, VMAX3, VMAX AF, or PowerMax array, remote adapter (RA) ports, SRDF Groups, and network links to the paired SRDF/Metro arrays 23

24 SRDF/Metro resiliency Witness examples Virtual Witness (vapp) Array Witness IP Connectivity IP Connectivity Witness SRDF Group Witness SRDF Group SRDF/Metro SRDF/Metro R1 Active-Active R2R2 R1 Active-Active R2R2 24

25 SRDF/Metro resiliency Witness best practices for production Configure multiple witnesses with 2 minimum for redundancy Utilize independent fault domains for each witness to include power and network domains Witnesses should not be placed in the same fault domains as the protected SRDF/Metro configuration Locate each witness within 40 ms network latency of paired arrays vwitness offers flexibility & redundancy due to IP protocol Spread vwitness installations over multiple servers for redundancy 25

26 SRDF/Metro resiliency Understanding Bias functionality (when a witness is not available/configured) If an SRDF link or device pair becomes Not Ready due to either a planned activity or unplanned event (a.k.a. Split Brain): SRDF/Metro must respond by choosing one side of the SRDF device pair to remain accessible to the hosts The other side of the SRDF device pair is then made inaccessible to the host and prevent data corruption Bias alone is not sufficient to protect a production environment and is recommended only for lab/test environments or when access to all configured witnesses in the environment has been lost 26

27 SRDF/Metro extended DR with SRDF/A Primary & secondary site DR protection Provides continuous, out of region asynchronous Disaster Recovery (DR) protection R11 SRDF/Metro R21 SRDF/A Only Active-Active R2 SRDF/A Only SRDF/A Only R2 27

28 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 28

29 NEW Device add/remove from active SRDF/Metro group Feature Add existing (non-rdf) devices to an active SRDF/Metro group while a host is actively using the volumes being added Remove devices being protected using SRDF/Metro Example: Add devices Benefits Achieve zero RPO & RTO for existing applications using SRDF/Metro Parity with other SRDF modes R1 SRDF/M Group R2 Use cases Protect non-rdf devices visible to the host using SRDF/Metro Remove devices visible to the host from SRDF/Metro protection 29

30 NEW Device move in/out of active SRDF/Metro group Feature Take an existing SRDF pair and move it into a SRDF/Metro group Take an existing SRDF pair in a SRDF/Metro group and move it to a SRDF/S or SRDF/Adaptive Copy Mode group Caveats Not applicable to devices using SRDF/A Example: Move SRDF/S devices into SRDF/Metro group Benefits Minimize initial sync and time to consistency Parity with other SRDF modes R1 SRDF/M Group R2 Use cases Protect existing SRDF/S or SRDF/Adaptive Copy Mode devices visible to the host using SRDF/Metro Move devices protected via SRDF/Metro to SRDF/S or SRDF/Adaptive Copy Mode protection R1 SRDF/S Group R2 30

31 Movepair Exempt functionality Previous software releases have not allowed movepair operations into an SRDF/Metro group (while suspended or active) Source Movepair SRDF group and devices must be Adaptive Copy or Synchronous modes (not SRDF/A) Target SRDF/Metro group may now be Active with device pair states of Suspended, SyncInProg, ActiveActive, or ActiveBias While synchronising, R1 devices will remain host accessible and R2 will remain inaccessible until these devices reach active mode 31

32 NEW DR and Fault-Aware Witness Feature Select the winning array out of the alive arrays as follows (in order): Host Cluster 1. Array with SRDF/A leg 2. Array with sync d SRDF/A leg 3. Array with greater than 50% supporting RDF/RA directors Applicable to both physical & virtual witness R22 Witness Benefits Select the best array to remain accessible to host for R/W operations during split-brain scenarios R11 SRDF/Metro R2 Use cases Witness deciding winning array in SRDF/Metro during failure conditions SRDF/A R22 32

33 NEW DR and Fault-Aware Witness In the event of a fault, the two sides of a witness-protected SRDF/Metro session will: Negotiate to determine the side better suited to continue servicing host IOs Priority will now be given to the side with a more available DR or system configuration That side will then become the winner side, reported as the R1 New witness will now take on bias responsibilities. User will no longer have the option to change bias location in active mode Set bias on suspend renamed to keep ( suspend -keep R2) 33

34 Agenda SRDF overview and history of innovation SRDF/Metro overview SRDF/Metro use cases and benefits SRDF/Metro technology deep dive What s new in SRDF/Metro Q&A 34

35 Related sessions SESSION Optimize your snapshot and remote replication performance to exceed your RPO/RTO SLAs Move your apps to PowerMax with zero downtime How to get blazing fast performance, optimized for your environment's demanding database applications Optimize and seamlessly integrate your virtual environment with PowerMax TIME/LOCATION Tue, May 1 3-4p Palazzo L Wed, May 2 1:30-2:30p Palazzo N Tue, May 1 3-4p Galileo 901 Thu, May a Delfino 4005 Tue, May 1 1:30-2:30p Marcello 4401A Thu, May 3 1-2p Delfino 4001A Mon, Apr p Lando 4205 Wed, May 2 1:30-2:30p Lando 4205 Want more info? Visit the PowerMax resource center:

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41 Resources to learn more on SRDF/Metro v v v v v SRDF/Metro Overview and Best Practices Technical Notes SRDF/Metro vwitness Configuration Guide Using SRDF/Metro in a VMware Metro Storage Cluster Running Oracle E-Business Suite and 12C RAC E-Lab Interoperability Navigator (ELN) VMAX Solutions Enabler SRDF Family CLI User Guide 41

42 Agenda Backup/Resource Slides 42

43 DEMO: Createpair Exempt Unisphere 43

44 DEMO: MovePair Exempt - Unisphere 44

45 DEMO: MovePair Exempt - Unisphere 45

46 DEMO: MovePair Exempt - Unisphere 46