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• Creating and storing journals at the primary storage system (see the next section),
• Copying journals to the secondary storage system
• Storing journals at the secondary storage system
• Selecting and restoring journals at the secondary storage system
• Types of journals
Creating and S
toring Journals at the Primary Storage System
When a primary
storage system performs an update (host-requested write I/O) on a URz primary data
volume, the p
rimary storage system creates a journal data to be transferred to secondary storage system.
The journal d
atawillbestoredintothe cacheat first, and then into the journal volume.
Metadata information will be attached to journal data (see Table 3 on page 37). When base-journal is
obtained, only metadata information is created and stored in UR cache or the journal volume.
Table 3 Metadata Information
Type Description
Journal type
Type of journal (e.g., base-journal or update journal)
LDEV No. (data)
The number of primary data volume that stores the original data
Original da
ta storing position
The primary data volume slot number, and the start and end of sub-block
number (data length)
LDEV No. (journal)
The volume number of master journal volume that stores the journal data
Journal data storing position
The slot number of master journal volume, and the start sub-block number
Journal seq
uence number
The sequenc
e number that is assigned when the journal is obtained
Timestamp
The time when the journal data is obtained
The journal sequence number indicates the primary data volume write sequence that the primary storage
system has created for each journal group. The journal data is transferred to the secondary storage system
asynchronously with the host I/O. The secondary storage system updates the secondary data volume in
thesameorder as theprimary data volume according tothe sequence number informationinthe journal.
URz processing continues uninterrupted if the SVP reboots or even if the SVP fails.
Copying Journals to the Secondary Storage System
When a primary subsystem receives a read journal command from a secondary subsystem, the primary
subsyst
em sends the journal data to the secondary subsystem. The secondary subsystem’s initiator ports
act as host processor channels and issue special I/O operations, called remote I/Os (RIOs), to the
primary subsystem. The RIO transfers the journal data in FBA format using a single channel command.
The primary subsystem can send several journal data using a single RIO, even if their sequence numbers
are not contiguous. Therefore, the journal data are usually sent to the secondary subsystem in a different
order t
han the journal data were created at the primary subsystem. The secondary subsystem ensures
that the journal data are applied to the secondary data volume in the correct sequence. This method of
remote I/O provides the most efficient use of primary subsystem-to-secondary subsystem link resources.
NOTE:
You mu
st make sure that your channel extenders are capable of supporting remote I/O. For further
details, please contact your Hitachi account team.
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200
37
- 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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