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HP XP P9500 HP P9000 Continuous Access Synchronous for Mainframe Systems User - Page 34

Planning data paths, Amount of bandwidth required, Fibre Channel requirements

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Table 17 Order of starting initial copy being performed Order of starting initial copy 1 M-VOL LDEV 02 2 LDEV 00 3 LDEV 01 4 LDEV 03 5 LDEV 11 6 LDEV 10 Value set for Priority 1 2 3 4 1 2 Remarks Cnt Ac-S Z pair for which initial copy is already instructed to be performed Cnt Ac-S Z pair for which initial copy is already instructed to be performed Cnt Ac-S Z pair for which initial copy is already instructed to be performed Cnt Ac-S Z pair for which initial copy is already instructed to be performed Cnt Ac-S Z pair for which initial copy is newly instructed to be performed Cnt Ac-S Z pair for which initial copy is newly instructed to be performed The Priority is determined within the range of the number of initial copy operations performed at the same time. Therefore, until the first initial copy operations complying with the order of the Priority are completed, the additional initial copy operations are not started. Planning data paths A data path must be designed to adequately manage all possible amounts of data that could be generated by the host and sent to the M-VOL and R-VOL. This section provides requirements and planning considerations for the following key elements of the data path: • "Amount of bandwidth required" (page 34) • "Fibre Channel requirements" (page 34) • "Supported data path configurations" (page 35) • "Planning ports" (page 37) Amount of bandwidth required Sufficient bandwidth must be present to handle data transfer of all workload levels. The amount of bandwidth required for your Continuous Access Synchronous Z system is based on the amount of I/O sent from the host to the main volume. You determine required bandwidth by measuring write-workload. Workload data is collected using RMF data. Consult your HP account team for more information. Fibre Channel requirements The main and remote disk arrays must be connected using multimode or single-mode optical fiber cables. • For distances up to 1.5 km (4,920 feet), multimode shortwave Fibre Channel interface cables are used. For distances between 0.5 km to 1.5 km, with at least one switch are required. You can use a maximum of two switches. • For the distances from 1.5 km to 10 km, (4,920 feet to 6.2 miles) single mode longwave optical fiber cables are required. • For distances from 10 km to 30 km (6.2 to 18.6 miles), single-mode longwave Fibre Channel interface cables with up to two switches are required. • For distances greater than 30 km. Approved third-party channel extender products and telecommunications lines are required. Continuous Access Synchronous Z operations typically do not extend past 30 km. 34 Planning for Continuous Access Synchronous Z

Section	Page
P9000 Continuous Access Synchronous for Mainframe Systems User Guide	1
Contents	3
1 Continuous Access Synchronous Z overview	7
How Continuous Access Synchronous Z works	7
Typical components	8
Disk arrays	8
Main (MCU), remote (RCU) disk arrays	9
Volume pairs	9
Data path	10
Consistency groups	10
Interfaces	10
Failover software	10
Error reporting communications	11
Overview of initial, update copy operations	11
Initial copy	11
Update copy	11
2 Requirements and specifications	13
System requirements	13
BCM specifications	14
Command device	17
F/M = FB message output control option when operating R-VOLs	17
PPRC specifications, restrictions	17
Continuous Access Synchronous Z operations performed with PPRC	18
Continuous Access Synchronous Z options not supported with PPRC	18
PPRC, BCM command comparison	19
P/DAS support, restrictions	20
Restrictions	20
GDPS support	20
RMF PPRC Link-path statistical information support	21
TPC-R cooperation support	23
Cache failure	24
Unregistered error code for TPC-R	24
3 Planning for Continuous Access Synchronous Z	25
Preparing P9500 disk arrays	25
Ensuring adequate cache	25
Installing or removing cache memory/shared memory	25
Using DASD fast write	25
Using an earlier model storage system	26
Enabling R-VOL Read, other system options	26
Planning for system performance	27
Planning volume pairs	29
Volume pair requirements and recommendations	29
Handling duplicate VOLSERs	30
Planning I/O to the R-VOL	31
Managing differential data	31
Maximum number of pairs supported	31
Calculating maximum number of pairs	31
Priority set for initial copy operations and scheduling order	33
Planning data paths	34
Amount of bandwidth required	34
Fibre Channel requirements	34
Supported data path configurations	35
Planning ports	37
Port requirements	37
Error reporting communications	37
4 Sharing Continuous Access Synchronous Z volumes	39
Volume types that can be shared with Continuous Access Synchronous Z	39
Continuous Access Journal Z	41
Business Copy Z	41
Configurations with Business Copy Z S-VOLs	41
Configurations with Business Copy Z T-VOLs	42
Status reporting, data currency	43
Virtual LVI/LUN	43
Cache Residency	44
Compatible XRC and CC	44
Auto LUN	44
Restrictions	44
5 Configuration operations	45
Configuration workflow	45
Define port attributes	45
Configure disk arrays and define logical paths	46
Configure additional logical paths	51
Set number of volumes to be copied concurrently, path watch time	52
6 Pair operations	55
Pair operations workflow	55
Check pair status	55
Create pairs	55
Suspend pairs	58
Resynchronize pairs	59
Delete pairs	59
Change fence level, other pair options	60
7 Monitoring and maintenance	61
Monitor pair status	61
How pair status changes	61
Pair status definitions	61
Suspend types	62
System behavior	63
Export pair information	64
Monitor copy operations, I/O	64
Select data to be graphed	65
Resize graph, save data	66
Monitor, maintain logical paths	66
Logical path status definitions	67
Delete logical paths	67
RCU maintenance	68
Change minimum paths, round trip time, other RCU options	68
Add, delete SSIDs for an RCU	68
Delete Continuous Access Synchronous Z	69
Managing power-off for disk arrays and network devices	69
General information	69
Planned outage of the main disk array	70
Planned outage of the remote disk array or data path	70
Planned outage of the main and remote systems	70
Miscellaneous maintenance	71
ICKDSF maintenance	71
8 Data migration	72
Migrate data	72
9 Planning and procedures for disaster recovery	74
Disaster recovery overview	74
Transfer sense information between sites	74
File and database recovery	74
CSUSPEND/QUIESCE TSO command	75
IEA494I system console message	75
Switch operations to the remote site	75
Analyze R-VOL currency	76
Transfer operations back to the main site	76
10 Troubleshooting	78
General troubleshooting	78
Error codes and messages	81
Service Information Messages (SIMs)	82
Pinned track recovery	82
11 Support and other resources	83
Contacting HP	83
Subscription service	83
Documentation feedback	83
Related information	83
HP websites	84
Conventions for storage capacity values	84
Typographic conventions	84
A Using PPRC commands for Continuous Access Synchronous Z	86
Overview of PPRC commands	86
CGROUP (FREEZE/RUN) support	88
Requirements	89
CGROUP (FREEZE/RUN) command	89
Using the CGROUP command	90
Using PPRC TSO commands with CGROUP support	91
IEA494I and IEA491E console messages	93
IEA494I message	93
IEA491E message	94
P9500 response characteristics to failure conditions	94
GDPS Continuous Access Synchronous Z Compatible XRC matrix	97
B Continuous Access Synchronous Z scripting	101
Scripting overview	101
Scripting syntax	103
Syntax overview	103
Script file requirements	104
Script symbols	104
Execute a script	105
Delete script files	106
Export script trace files	106
Operation macro commands	107
Create pairs	107
Release pairs	110
Suspend pairs	111
Resynchronize pairs	112
Change pair options	113
Start a pair	114
Get pair status	114
Select devices	115
Internal macro commands	116
Internal macro command definitions	117
AddList	117
Delay	117
End	117
If / EndIf	117
MakeString	118
Message	119
SetList	119
Start	119
Work variables	120
Reserved variables	120
Reserved result variables	120
Reserved status variables	121
Optional script parameters	122
Error reporting	124
C Continuous Access Synchronous Z GUI reference	129
Continuous Access Synchronous Z windows	129
Pair Operation window	130
Detailed Information dialog box	132
Add Pair dialog box	134
Suspend Pair dialog box	135
Resume Pair dialog box	136
Delete Pair dialog box	137
Change Pair Option dialog box	137
Display Filter dialog box	138
RCU Operation window	138
RCU Operations list when “MCU&RCU” selected	140
When LDKC, a CU group, or CU is selected in tree	140
When an MCU or RCU is selected in tree	141
RCU Operations list when “Port” selected	141
RCU Status dialog box	142
Add RCU dialog box	143
RCU Option dialog box	144
Add Path dialog box	144
Add SSID dialog box	145
Usage Monitor window	145
History window	146
History window notes	147
Export operations history	147
System Option window	148
Glossary	149

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Table 17 Order of starting initial copy being performed

Remarks

Value set for Priority

M-VOL

Order of starting initial

copy