Sysplex in a Nutshell
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Transcript of Sysplex in a Nutshell
®
IBM Software Group – Enterprise Networking Solutions
z/OS® Communications Server
z/OS Communications Server Development, Raleigh, North Carolina
Sysplex In a Nutshell
Andrew Arrowood - [email protected]
IBM Software Group – Enterprise Networking Solutions
Page 2
Interface 21:
IP Addr 2234::2
Interface 22:
IP Addr 2235::2
Background – Virtual IP Address
Application access independent of network topology
– VIPA identifies the server application, not the physical interface
– Physical interface IP addresses can change without affecting end-user
– No changes needed in DNS or hosts file configuration
Interface resilience
– Communication with a server host is unaffected as long as a physical interface is active
– Example: As long as interface 21 or 22 is active, the connection to the CICS application stays active
TCPIP1 CICS
201.81.1.0
PORT 5000
Advertise: VIPA 201.81.1.0
IBM Software Group – Enterprise Networking Solutions
Page 3
DYNAMICXCF Interfaces
TCP/IP
Stack-1
TCP/IP
Stack-2
LPAR-1
TCP/IP
Stack-3
LPAR-2
zSeries CPC-1
HiperSocketsIUTSAMEH
TCP/IP
Stack-4
LPAR-3
CPC-2
XCF Signaling
Dynamic connectivity is automatically established between all sysplexmembers
Using XCF messaging, each stack automatically learns of other sysplexmembers
Under-the-covers DYNAMICXCF interfaces are created using one of three transport technologies depending on availability and location of partner stack
– Inside same LPAR: IUTSAMEH (memory-link inside a z/OS system)
– Inside same CPC: HiperSockets (if enabled for that purpose via IQDCHPID VTAM start option)
– Between CPCs – XCF Signaling
IBM Software Group – Enterprise Networking Solutions
Page 4
Coupling
Facility
Sysplex Dynamic VIPAs, Stack managed DVIPAs
LPAR1
CICS
TCPIP1
Advertise:
201.81.10.7
VIPADEFINE
255.255.255.0 201.81.10.7
Single System Image:
– Location of application transparent to clients
– DVIPA identifies the TCP application independently of which stack in the Sysplex the server is currently active on
LPAR2
CICS
TCPIP2
VIPABACKUP
200 201.81.10.7
LPAR3
CICS
TCPIP3
VIPABACKUP
100 201.81.10.7
DVIPA activation is managed by the stacks:
– VIPADEFINE statement - defines the primary owner of the DVIPA
– VIPABACKUP statement –defines the backup owner(s) of the DVIPA
• Highest Rank determines which stack takes over
– TCPIP2 Rank 200
– TCPIP3 rank 100
Coupling Facility
– XCF messaging between sysplex members
– Automatic notification of member changes
IBM Software Group – Enterprise Networking Solutions
Page 5
Coupling
Facility
Sysplex Dynamic VIPAs, Stack managed DVIPAs
LPAR1
CICS
TCPIP1
VIPADEFINE
255.255.255.0 201.81.10.7
LPAR2
CICS
TCPIP2
VIPABACKUP
200 201.81.10.7
LPAR3
CICS
TCPIP3
VIPABACKUP
100 201.81.10.7
Unplanned takeover
If TCPIP1 fails,
– DVIPA moves to TCPIP2 since it is highest ranked backup,
– TCPIP2 advertises the DVIPA
– TCPIP2 CICS application takes over workload
– TCPIP2 sends connection resets to client on behalf of stack 1 which reduces workload restart time Advertise:
201.81.10.7
IBM Software Group – Enterprise Networking Solutions
Page 6
Coupling
Facility
Sysplex Dynamic VIPAs, Stack managed DVIPAs
LPAR1
CICS
TCPIP1
VIPADEFINE
255.255.255.0 201.81.10.7
LPAR2
CICS
TCPIP2
VIPABACKUP
200 201.81.10.7
LPAR3
CICS
TCPIP3
VIPABACKUP
100 201.81.10.7
Planned takeover
TCPIP1 is restarted
– DVIPA moves back to TCPIP1
– TCPIP1 advertises the DVIPA
– TCPIP1 handles routing for workload still going to TCPIP2 CICS
– TCPIP1 CICS application takes over new workload
Advertise:
201.81.10.7
V TCPIP,TCPIP1,SYSPLEX,DEACT,DVIPA=201.81.10.7
V TCPIP,TCPIP1,SYSPLEX,REACT,DVIPA=201.81.10.7
Operator commands allow planned takeover without changing configuration:
IBM Software Group – Enterprise Networking Solutions
Page 7
Application-specific DVIPAs
Single-instance applications require that one instance is active in the Sysplex:
– Application may need exclusive access to certain resources
The Application controls the activation and movement of the DVIPA:
– In the example, CICS1 initially causes the DVIPA to be created on stack 3 (Bind or MODDVIPA IOCTL)
– The application fails, and restarts on another LPAR (stack 4), causing the DVIPA to move from stack 3 to stack 4 (existing connections will be reset)
– Speed of recovery – controlled by ARM (Automated Restart Manager) or automated operations
TCPIP3
CICS1
10.1.1.1
Advertise:
DVIPA 10.1.1.1
TCPIP4
CICS1
10.1.1.1
Advertise:
DVIPA 10.1.1.1
CICS1 fails.
Restarts on Stack4
DNS
Resolve:
cics1.mycom.comEither:
1. Resolve cics1.mycom.com
2. Connect to returned address
Or
1. Connect to cached (or hardcoded)
address
10.1.1.1 is an application-specific DVIPA
VIPARANGE statement defines a subnet range
VIPARANGE 255.255.0.0 10.1.0.0
10.1.1.1
IBM Software Group – Enterprise Networking Solutions
Page 8
Advertise:
201.81.10.7
VIPADEFINE
255.255.255.0 201.81.10.7
VIPADISTRIBUTE
DISTMETHOD SERVERWLM
201.81.10.7 PORT 5000
DESTIP ALL
Sysplex Dynamic VIPAs, Distributed DVIPAs
LPAR1
CICS
5000
TCPIP1
LPAR2
TCPIP2
LPAR3
TCPIP3
LPAR2
TCPIP2
VIPABACKUP
200 201.81.10.7
Single System Image:
– Multiple applications look like a single application to clients
– DVIPA identifies the TCP application independently of which stacks the application is currently active on
Sysplex Distributor:
– Balances Workload within Sysplex by using a distributed DVIPA, advertised by the distributing stack
Datapath - either
– XCF interfaces or VIPAROUTE
VIPAROUTE
– IP route from distributor to target
– Allows OSA instead of XCF
– Doesn’t use CF resources
Sysplex
Distributor
CICS
5000
CICS
5000
VIPADISTRIBUTE statement
– specify DVIPA (and PORT(s)) of listening applications
• Dynamic Ports – Learn port as application starts a Listener
– DISTMETHOD - distribution method
– DESTIP – XCF IP address of each target stack or ALLstacks
IBM Software Group – Enterprise Networking Solutions
Page 9
Sysplex Distribution methods
The sysplex distributor uses one of five distribution methods when routing incoming connections to TCP/IP stacks:
– Static Distribution:• RoundRobin – Evenly distribute connections to all targets• WeightedActive – Balance active connections to all targets based on configured weight
proportions
– Distribution using dynamic WLM recommendation:Weighted round-robin distribution based on a normalized WLM weight:• BaseWLM – WLM system weights
– Comparison of displaceable CP capacity of lower importance work
• ServerWLM – WLM server-specific weights– Comparison of displaceable CP capacity given importance level of workload– How well is application meeting their WLM service class goals
– HotStandby – one active target, multiple backups
10 Connection Requests
3 Connections
2 Connections
XCF1
XCF2
Distributor
XCF35 ConnectionsXCF2 XCF3
XCF1
Normalized
Weight
25
3Ready 1Ready 1
Ready 1
Distribution using WLM recommendations:
IBM Software Group – Enterprise Networking Solutions
Page 10
Sysplex Distribution using WLM – additional monitoring
TSR: Target Server Responsiveness fraction, which is a compound health-metric per target server (range from 0 (bad) to 100 (good)):
– TCSR: Target Connectivity Success Rate. Connectivity between the distributing stack and the target stack - are the new connection requests reaching the target? (0 is bad, 100 is good)
– SEF: Server accept Efficiency Fraction. Target Server accept efficiency - is the server accepting new work? (0 is bad, 100 is good)
– QoS: QoS fractions. Consider retransmits and packet loss. (0 is good, 100 is bad)
– Number of half-open connections also impact the TSR value
CER: Connection Establishment Rate. Network connectivity between Server and client - are new connections being established? (0 is bad, 100 is good)
– Does not impact the TSR value, but is included in netstat displays
IBM Software Group – Enterprise Networking Solutions
Page 11
Sysplex Distribution - Weighted Active
10 Connection Requests
3 Connections
2 Connections
XCF1
XCF2
Distributor
XCF35 Connections
Initial Distribution
Active Conns
XCF2 20 0 2XCF3 50 0 5
XCF1 30 0 3
VIPADEFINE DVIPA1
VIPADISTRIBUTE DISTMETHOD WEIGHTEDACTIVE
DVIPA1 PORT 6000
DESTIP XCF1 WEIGHT 30
XCF2 WEIGHT 20
XCF3 WEIGHT 50
Active connections balanced across ready targets
10 Connection Requests10 Connections
XCF1
XCF2
Distributor
XCF3
Over Time
Active Conns
XCF2 20 190 200XCF3 50 530 530
XCF1 30 300 300
ReadyReady
Ready
ReadyReady
Ready
IBM Software Group – Enterprise Networking Solutions
Page 12
Sysplex Distributor - Hot Standby support
A single target server receives all new connection requests
– Other target servers are active but not receiving new connection requests
– Automatically route traffic to “hot-standby” target server when the active target server is not available
Enable using a new HOTSTANDBY distribution method
– One preferred target
– And one or more backup targets ranked in order of preference
– A target is not available when:
• Not ready
• Route to target is inactive
• If HEALTHSWITCH option configured – target is not healthy when
– TSR = 0% OR
– Abnormal terminations = 1000 OR
– Server reported Health = 0%
– AUTOSWITCHBACK option - switch to the preferred target if it becomes available
• No auto switch back if reason for original switch was health problems
– Use a V TCPIP Quiesce and Resume sequence
Sysplex
Distributor
Preferred
Target
server
Backup
Target
server
DB2 DB2
DB2 Data
sharing group
VIPADEFINE DVIPA1
VIPADISTRIBUTE DISTMETHOD HOTSTANDBY
AUTOSWITCHBACK HEALTHSWITCH
DVIPA1 PORT nnnn
DESTIP XCF1 PREFERRED
DESTIP XCF2 BACKUP 50
DESTIP XCF3 BACKUP 100
IBM Software Group – Enterprise Networking Solutions
Page 13
Sysplex Distribution – ServerWLM Importance level weighting
Server-specific weights
Comparison of displaceable capacity given the importance level of the service class.
Importance
level
0
1
2
3
5
4
6
7
LPAR2
0 Service units
0 Service units
0 Service units
0 Service units
500 Service units
LPAR1
0 Service units
0 Service units
0 Service units
0 Service units
500 Service units
New JAVA work
Importance level 2
Displaces
Level 3-7 Workloads
Example:
WLM weights – same for LPAR1 and LPAR2 – Same displaceable level 3 – 7 SUs, 500 SUs
But LPAR2 (500 SUs IL 5) should be favored over LPAR 1 (500 SUs IL 3)
ILWEIGHTING parameter - favor LPARs with lower importance level displaceable SUs – IL 0 Ignore – no change from existing logic. – IL 1 Moderate – IL 2 Aggressive – IL 3 Exceptionally Aggressive
VIPADISTRIBUTE
DISTMETHOD SERVERWLM
ILWEIGHTING 1
IBM Software Group – Enterprise Networking Solutions
Page 14
WLM weights and specialty processors
Distribution also considers specialty processors:
Specialty processors are deployed and exploited by targeted workloads on z/OS:
zAAP (zSeries Application Assist Processor) – JAVA workloads such as WAS
zIIP (System z Integrated Information Processor)
– DB2 related workloads
– z/OS IPSEC workloads
IBM Software Group – Enterprise Networking Solutions
Page 15
Sysplex Distribution – ServerWLM Crossover CostServer-specific weights
Comparison of displaceable capacity based on actual usage percentage of each processor by the workload
Example:
JAVA workload designed to use 10% CP 90% zAAP SUs
Each LPAR has same displaceable capacity - 1000 SUs
But as 1000 SUs are consumed - ideally 100 CP and 900 zAAP SUs consumed
PROCXCOST parm penalizes zAAP intended SUs that crossover and run on the CP
Higher PROXCOST value, the more WLM favors LPAR2
PROCXCOST ZAAP 1 ZIIP 1 – no penalty LPAR1 = LPAR2
VIPADISTRIBUTE
DISTMETHOD SERVERWLM
PROCXCOST ZAAP 5 ZIIP 5
Displaces
Level 3-7 WorkloadsNew JAVA work
Importance level 2
Designed Usage
CP 10% zAAP 90%Actual LPAR1 Usage
CP 90% zAAP 10%VS
LPAR2
CP SUs zAAP SUs
0
1
2
3
5
4
6
7
100 SUs 900 SUs
0 SUs 0 SUs
0 SUs 0 SUs
0 SUs 0 SUs
0 SUs 0 SUs
Importance
level
CP SUs zAAP SUs
900 SUs 100 SUs
0 SUs 0 SUs
0 SUs 0 SUs
0 SUs 0 SUs
LPAR1
0 SUs 0 SUs
IBM Software Group – Enterprise Networking Solutions
Page 16
Sysplex Distribution - Timed Affinity
LPAR1 LPAR2 LPAR4LPAR3
CICS1 CICS2 CICS4CICS3
TCPIP2 TCPIP3 TCPIP3TCPIP1
External Network
TIMEDAFFINITY– Choose target for new client using distribution method– Same target for new connections from same client IP@– Keep affinity until TIMEDAFFINITY seconds after last
connection ends
VIPADISTRIBUTE TIMEDAFFINITY 5– Keep affinity until 5 seconds after last connection ends.
Used with
– Base and Server WLM distribution– Weighted Active– Round Robin
201.81.10.1
Tier 1 SD
199.81.10.2
IBM Software Group – Enterprise Networking Solutions
Page 17
Sysplex Distribution – OPTLOCAL, Optimized local routing
LPAR1 LPAR2 LPAR4LPAR3
CICS1 CICS2
Tier 1 SD
CICS4CICS3
Tier 2 Connection setup and Data path stay local when possible
Tier 2 SD
WAS1 WAS2 WAS4WAS3
Client Connections
VIPADISTRIBUTE OPTLOCAL
•Prefer local server
•Control level of preference
Sysplex Distributor can
optimize session setup
and datapath when
connection endpoints
are on the same TCP/IP
stack
•OPTLOCAL 0: Use local server
if there are no server problems:
not ready, backlog growing, abnormal transactions, server health
•OPTLOCAL 1: Use local server
if there are no server problems & WLM raw weight is not zero.
•OPTLOCAL 2-16: Use local server
if there are no server problems & WLM raw weight is not zero &
normalized weight * value > normalized weight of non-local servers
TCPIP2 TCPIP3 TCPIP3TCPIP1
Use SD if OPTLOCAL
conditions not met
External Network
IBM Software Group – Enterprise Networking Solutions
Page 18
Sysplex Distribution - Tier 1 load balancing using Tier2 application awareness
LPAR1 LPAR2 LPAR4LPAR3
CICS1 CICS2
Tier 1 SD
CICS4CICS3
WAS1 WAS2 WAS4WAS3
TCPIP2 TCPIP3 TCPIP4TCPIP1
WLM 10 WLM 10 WLM 10 WLM 10
•Tier 1 distribution decision - based on
both application tiers
•Application tiers linked by group name
•The Tier 1 distributor chooses target
using combined weight of Tier1 and
Tier2 Group1 servers on each LPAR
Tier 1 GROUP1
Tier 2 GROUP1
T1T2 5 T1T2 10 T1T2 10T1T2 10
Tier 2 SD
WLM 1 WLM 10 WLM 10 WLM 10
VIPADEFINE TIER1
255.255.255.0 DVIPA1
VIPADISTRIBUTE TIER1 GROUP1
DISTMETHOD SERVERWLM
DVIPA1 Port 10000
DESTIP ALL
1
VIPADEFINE TIER2
255.255.255.0 DVIPA2
VIPADISTRIBUTE TIER2 GROUP1
OPTLOCAL 1
DISTMETHOD SERVERWLM
DVIPA2 Port 10002
DESTIP ALL
2
2
1
IBM Software Group – Enterprise Networking Solutions
Page 19
Sysplex Distribution - Tier 1/Tier 2 CPC optimizations
CPC2
LPAR1 LPAR4LPAR3
Tier 1 SD
Tier 2 SD CPCSCOPE
WAS4WAS3
TCPIP3 TCPIP4TCPIP1
WLM 0 WLM 10
WLM 10 WLM 10
WLM 10
T1T2 5 T1T2 10 T1T2 10
CPC1
WAS1
CICS1 CICS4CICS3Tier 2 GROUP1
LPAR2
TCPIP2
T1T2 10
CICS2
Tier 2 SD CPCSCOPE
WLM 10 WLM 10
Tier 1 GROUP1
T2
GR
OU
P1
Wts
Client Connections
WAS2
WLM 10
Tier 2 GROUP1
VIPADEFINE TIER1
255.255.255.0 DVIPA1
VIPADISTRIBUTE TIER1 GROUP1
DISTMETHOD SERVERWLM
DVIPA1 Port 10000
DESTIP XCF1 XCF2 XCF3 XCF4
1
VIPADEFINE TIER2 CPCSCOPE
255.255.255.0 DVIPA3
VIPADISTRIBUTE TIER2 GROUP1
OPTLOCAL 1
DISTMETHOD SERVERWLM
DVIPA3 Port 10002
DESTIP ALL
2
CPCSCOPE – keep connections with Tier 2 SD’s CPC
VIPABACKUP DVIPA – within CPC
When Tier 1 SD chooses WAS1
– Tier 2 SD will choose CICS2 since CICS1 weight is 0
– Tier 2 connection path stays within CPC
• Better performance
• Potential to relax security requirements
2
1
IBM Software Group – Enterprise Networking Solutions
Page 20
Sysplex Distributor support for DataPower
CPC1
LPAR1 LPAR2 LPAR4LPAR3
CICS CICS CICSCICS
WAS WAS WASWAS
TCPIP2 TCPIP3 TCPIP3TCPIP1
IMS IMS IMSIMS
DB2 DB2 DB2DB2
Tier1:
CPC2
Sysplex Distributor Sysplex Distributor Web
Service
request
Sysplex Distributor
•DataPower weights for Load Balancing
•Connection state information allows
non-disruptive takeover, return path to
bypass SD
Tier1 SD TCP control connection to each DataPower
Distributor sends DVIPA/Ports & polling interval
DataPower
– Configures non-advertised DVIPAs
Sends:
– Server availability
– Connection states• Allows non-disruptive takeover
by backup SD
• Termination – allows GRE routing (bypass SD on return path)
– Weight (capacity)• SD load balances using
DataPower weights
IBM Software Group – Enterprise Networking Solutions
Page 21
Sysplex Distributor support for DataPower, Target Controlled distribution
LPAR1 LPAR2 LPAR4LPAR3
Tier 1 SD
WAS1 WAS2 WAS4WAS3
TCPIP2 TCPIP3 TCPIP4TCPIP1
Tier 1 GROUP1
Tier 2 SD
WLM 10 WLM 10 WLM 10 WLM 10
201.81.10.1
1VIPADEFINE TIER1
255.255.255.0 DVIPA1
VIPADISTRIBUTE TIER1 GROUP1
GRE CONTROLPORT 1702
DISTMETHOD TARGCONTROLLED
DVIPA1 Port 10000
DESTIP 201.81.10.1 201.81.10.2
201.81.20.3 201.81.20.4Web
Service
request
1
201.81.10.2
DATAP1 DATAP2 DATAP3 DATAP4
201.81.20.3 201.81.20.4
Tier 1 SD supports DataPower:
TARGCONTROLLED distribution
GRE
– Target is non-z/OS target (DataPower)
– Routing type is GRE
CONTROLPORT
– destination port for TCP control connection
IBM Software Group – Enterprise Networking Solutions
Page 22
Solution: Sysplex Distributor Multi-Site support for DataPower
CPC1 CPC2
LPAR1 LPAR2 LPAR4LPAR3
Tier 1 SD
WAS1 WAS2 WAS4WAS3
TCPIP2 TCPIP3 TCPIP4TCPIP1
•Each DataPower - configured to
connect to a group of servers on a
site (CPC).
•Tier 1 distribution – load balance
using DataPower weight and site
weight of matching Tier 2 server
group (GROUP1)
•DATAP4 is preferred over DATAP3
based on reported datapower
weights.
•DATAP3 & DATAP4 are preferred
over DATAP1 and DATAP2 based
on TIER 2 server weights.
Tier 1 GROUP1
Tier 2 GROUP1
WLM 2 WLM 10 WLM 10 WLM 10
Web
Service
request
DATAP1
DP Wt 500
Tier 2 SD CPCSCOPE Tier 2 SD CPCSCOPE
DATAP2
DP Wt 500
DATAP3
DP Wt 500
DATAP4
DP Wt 900
NmWt 3 NmWt 3 NmWt 5 NmWt 9
IBM Software Group – Enterprise Networking Solutions
Page 23
SYSPLEXPORTS - Outbound Connections from Distributed DVIPAs
SYSPLEXPORTS:
– Ensure unique ephemeral source ports for each DVIPA in sysplex
– Coupling Facility - manages source DVIPA ports.
– Allocated from CF inblocks of 64 ports
– Used as server applications establish connections to clients
Client IP address 8.1.1.1 Port 3001
TCPIP2 connections from from DVIPA 10.1.1.1 uses source ports from 5001-5064 port range
TCPIP3 connections from DVIPA 10.1.1.1 uses source ports from 5068, 5070-5129 range
TCPIP1
TCPIP2
TCPIP3
Sysplex
Distributor
CICS
10.1.1.1
CICS
10.1.1.1
Advertise:
DVIPA 10.1.1.1
DVIPA 10.1.1.1
…
5001-5064
5068,5070-5129
IBM Software Group – Enterprise Networking Solutions
Page 24
SWSA – Sysplex Wide Security Associations
2. Shadow tunnel
created from target
back to client
1. Distributor handles
SA negotiation
Sysplex Distributor support for IP Sec workloads target systems
Distributor handles SA negotiation and refresh
Requires Coupling Facility DVIPA Takeover
–Keeps Tunnel renegotiation information
–Tunnel sequence number for shared tunnel
–SYSPLEXPORTS - ensure unique source ports for outbound connections from distributed applications back to the same client
TCPIP2
CICS
10.1.1.1
TCPIP3
CICS
10.1.1.1
TCPIP1
Sysplex
Distributor
Advertise:
DVIPA 10.1.1.1
IBM Software Group – Enterprise Networking Solutions
Page 25
XCF Monitor:
Is each Stack’s
sysplex component
responsive?
Sysplex Autonomics Stack Monitor:
OMPROUTE up?
VTAM up?
XCF links up?
Am I ok?
Connectivity to
router?
Stack Monitor:
OMPROUTE up?
VTAM up?
XCF links up?
Am I ok?
Connectivity to
router?
Stack Monitor:
OMPROUTE up?
VTAM up?
XCF links up?
Am I ok?
Connectivity to
router?
Sysplex Problem Detection and Recovery
GLOBALCONFIG SYSPLEXMONITOR TIMERSECS 60(NO)DELAYJOIN(NO)MONINTERFACE (NO)DYNROUTE(NO)RECOVERY (NO)AUTOREJOIN
Detect problems that affect TCP/IP Sysplex Health:
– Time dependent monitoring:
• Is OMPROUTE active?
• Is VTAM active?
• Is storage (common or private) critical?
• Are important interfaces (and routes over those interfaces) active?
• XCF detection – Are sysplex functions responsive?
– Non-time dependent monitoring – Sysplex abend
Recovery from problems:
–Leave sysplex group (RECOVERY)
–Issue actionable message
–Monitoring continues for recoverable problems
•OMPROUTE, VTAM, Storage, Interface (and route)
•When problem clears, clear message, rejoin sysplex group (AUTOREJOIN)
IBM Software Group – Enterprise Networking Solutions
Page 26
Subplexing
Subplexing allows isolation of multiple secure areas.
•Without subplexing:
SD requires DYNAMICXCF
–Establishes IP Connectivity to all stacks in Sysplex
–Dynamic IP@ discovery across sysplex
Coupling Facility resources span the sysplex
–VTAM generic resource, Multi-Node Persistent Sessions resources
–Sysplex ports resources, SWSA resources
LPAR2LPAR1 LPAR3 LPAR4 LPAR5
VTAM1
Internet SNA
TCPIP1
Intranet Production IP
Intranet Dev. IP
TCPIP2 TCPIP3 TCPIP4 TCPIP5TCPIP8
VTAM3 VTAM4 VTAM5VTAM2
TCPIP6 TCPIP7
Internet IP
Intranet SNA
IBM Software Group – Enterprise Networking Solutions
Page 27
LPAR2
Internet SNA subplex
VTAM XCFGRPID:Default (01)
LPAR1 LPAR3 LPAR4 LPAR5
VTAM2VTAM1
Internet IP subplex
TCP/IP XCFGRPID:Default (01)
TCPIP2TCPIP1
Intranet SNA subplex
VTAM XCFGRPID: 21
VTAM3 VTAM4 VTAM5
Intranet Production IP subplex
TCP/IP XCFGRPID: 02
TCPIP3 TCPIP4 TCPIP5
TCPIP8
Intranet Dev. IP subplex
TCP/IP XCFGRPID: 04
TCPIP7TCPIP6
Sysplex Group: EZBTCPCS Sysplex Group: EZBT2102
Sysplex Group: EZBT2104
SubplexingDYNAMICXCF
–Establishes IP Connectivity to all stacks in Subplex
–Dynamic IP@ discovery across subplex
Coupling Facility resources span the subplex
–VTAM generic resource, Multi-Node Persistent Sessions resources
–Sysplex ports resources, SWSA resources