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Table 18 Journal Group Specifications
Item
Support specifications
Number of journal groups
Up to 256 journal groups (No. 0 - 255) per one storage subsystem
NOTE:
The recommende
d number of journal groups is up to 16
Number of data volumes in a journal
group
Up to 4,096
Number of journal volumes in a journal
group
Up to 64
Number of Mirr
or IDs
Up to 4 (ID No.:
0to3)
NOTE:
If TCzSync. uses No. 0,No. 1to3areavailable forURz.
The same number of journal volumes is not required in the master journal group and the restore journal
group that are paired.
Mirror ID is required for the configuration that will be supported in the future within the 3-data center
(3DC), including the expected future enhancement to enable the user to pair one master journal group with
two or more re
store journal groups. Each pair relationship in a journal group is called "Mirror." Mirror ID
identifies tw
o or more mirrors that one journal group has. The same Mirror ID of the journal group is
applied to t
he data volume pair. See“TCz Synchronous (3DC Cascading Configuration)”onpage89.
•
Table 19 on page 63 shows the specifications of relationship between the data volumes, between
the journal
volumes, and between the data volumes and journal volumes in a journal group.
Table 19 Jou
rnal Group Volume Specifications
Item
Support specifications
Emulation
type
Same emulation type.
Volume
capacity
Does not matter whether the capacity is the same or different.
CLPR
Journal volumes and data volumes in the same journal group can belong to different
CLPRs. Journal volumes must belong to the same CLPR. Data volumes must also belong
to the same CLPR.
A primary journal group and the corresponding restore journal group need not belong
to the same CLPR.
NOTE:
When URz and UR coexist in the same storage system, each journal group must contain either URz pairs
or UR pairs (not both).
Accessing URz Primary Data Volume and Secondary Data Volume
To ensure maximum data integrity during normal URz operations, the secondary storage system rejects
all the read/write operations issued by a host to a URz secondary data volume. If you need write
operation to a URz secondary data volume, you must set the secondary data volume write option (see
“Secondary Data Volume Write Option” on page 36). When you resume (Resume Pair) the split pair,
the secondary storage system will send the secondary data volume track bitmap to the primary storage
system to ensure proper resynchronization of the pair.
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200
63
- SVS 200 1
- Contents 3
- Figures 8
- About this Guide 13
- Document Conven 14
- Getting Help 15
- Benefits 18
- Business Solutions 18
- Hitachi Shad 19
- Journal Obtain 22
- Journal Copy 22
- Journal Restore 22
- URz Components 23
- Main and Remote C 25
- Journal Group 25
- Data Volume Pair 26
- Journal Volume 26
- Remote Copy Connections 28
- URzRemoteConsole Software 29
- Host I/O 29
- Time-Stamping Function 29
- Remote Copy Operations 30
- Update Co 31
- Journal Group Operations 31
- Logical DKC (LDKC) 33
- Update Copy Operation 35
- Journal Processing 36
- Creating and S 37
- Storing Journa 38
- Types of Journal 39
- URz Delta Resync Operation 40
- Journal Obta 41
- URz Pair Status 45
- Pair Status Description 47
- Suspend Types 48
- URz Suspension Condition 50
- Command Device 53
- System Requirements 55
- Disk Track Format 56
- Logical Volume Types 57
- The Maximum Number of Pairs 59
- Installing the Hardware 64
- Enabling the URz Option(s) 66
- Planning of Journal Volumes 67
- Journal Volume C 69
- DKC Journal Transfer Speed 70
- System for Remote Console 72
- Basic Behavior 73
- Storage Systems are Used) 74
- Extended Consistency Groups 74
- Systems 77
- Disaster Recov 78
- Combining URz w 79
- Combining 81
- Figure 25 Res 85
- Using At-T 87
- Business Continuity Manager 88
- Hardware Configuration 91
- Setup Procedure 92
- Configuration) 100
- Operation Window 107
- Displaying Info 111
- Configuring Port Attributes 112
- Changing Option 116
- Adding Logical Paths 117
- Deleting Logical Paths 118
- Viewing the St 119
- Removing 121
- Secondar 121
- 5 Using Journal Groups 123
- Using Journal Groups 124
- Caution: 128
- Cautions: 132
- Deleting a Journal Group 141
- Splitting a 142
- Consistency Group 145
- Saving Pair S 154
- Displayin 159
- 7 Monitoring Remote Copy 171
- Operations 171
- Statistic Description 174
- 8Viewing HistoryofDataVolume 175
- Pair Operations 175
- Displaying th 181
- Clearing SIMs 183
- Displaying a L 190
- A master journal group 191
- A restore journal group 191
- Switching Opera 198
- 12 Troubleshooting 201
- Path Status 203
- Troubleshooting 208
- 13 Power Management for Disk 209
- Storage Systems and Network 209
- Relay Devices 209
- Volumes 213
- 15 SIM Reporting 215
- Acronyms and Abbreviations 218
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