Hp XP P9500 Storage User Manual Page 68
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S-VOL accessP-VOL
access
DescriptionRAID Manager statusRWC status
If the delta resync operation is run on a pair in HOLDING
status, the operation could fail. If you specify Entire for the
delta resync Failure field on the Change Journal Option
dialog box, differential data is copied to an S-VOL.
-Read/Write
1
(No parallel RAID
Manager status)
HLDE
• An error occurred on a pair in HOLD status.
• When P-VOL status is HLDE, incoming write data for the
Cnt Ac-S S-VOL is not stored in the master journal volume.
• Operations allowed on pairs in HLDE status:
- Recover pair status to standby (HOLD)
- Pair delete
- Change pair options
Read Only,
unless write
Read
/Write
4
This status results when the journal volume becomes full and
suspends. Pair status changes from COPY, PAIR or PFUL to
PFUS. The Cnt Ac-J pair is suspended and the copy operation
PFUS(No parallel
RWC status)
option is
enabled.stops. Make sure to review configuration of the logical path
and journal volume.
• If a Thin Provisioning virtual volume (THP V-VOL) is used
as the Cnt Ac-J S-VOL, and the capacity of a pool-VOL
is nearly full, Cnt Ac-J status becomes PFUS and the pair
is suspended.
• If the journal option Inflow Control is set to Yes when
status changes to PFUS, the pair is not suspended for the
time set in the Data Overflow Watch field, even when
the journal volume becomes full. During the time it takes
for the journal data area to clear, the response to host
I/O is delayed.
See “Changing options used by journals ” (page 81) for
more information on Data Overflow Watch.
Read/WriteRead OnlyAfter Takeover, SSWS is the status of the S-VOL. With this
status, data can be written to the S-VOL.
SSWS(No parallel
RWC status)
1. Accessing the P-VOL depends on the status of the Cnt Ac-S pair that shares the volume.
2. The Cnt Ac-J S-VOL in HOLD status uses two mirrors. Accessing the S-VOL depends on the status of the mirror that is not HOLD.
If the configuration is a 3 Cnt Ac-J DC, the host cannot write data regardless of whether the status of the mirror is not HOLD.
3. 2: The Cnt Ac-J S-VOL in HOLD status uses two mirrors. Accessing the S-VOL depends on the status of the mirror that is not
HOLD. If the configuration is a 3 Cnt Ac-J DC, the host cannot write data regardless of the status of the mirror that is not
HOLD.
4. HOLDING indicates either that differential data used for a delta resync operation does not exist or that the system cannot
judge whether the delta resync can be performed without the differential data.
When differential data does not exist in the secondary Cnt Ac-S site, even after the S-VOL is updated, the differential data
might be discarded due to the one of the following reasons:
• The cache or shared memory was added to or removed from the system during maintenance work.
• The system was powered off during maintenance work.
• The Cnt Ac-J or Cnt Ac-S pair was suspended and then resynchronized.
After the system is back to normal, differential data is stored again in the Cnt Ac-S S-VOL if you update the data in the primary
site.
The delta resync operation can be executed without differential data if the primary site has not received a data update or if
data in the Cnt Ac-S S-VOL and the Cnt Ac-J S-VOL is the same.
To execute the delta resync without differential data, set up remote command devices for the delta resync configuration (see
“Assigning remote command devices ” (page 148)). Then change the status of Cnt Ac-J and Cnt Ac-S pairs that belong to the
journal in the primary site to PAIR by the resynchronizing operation.
Even if the delta resync operation without differential data is executable, the pair status changes to HOLD regardless of the
differential data existing if the conditions of the differential data discarding are satisfied as mentioned above. To change the
68 Monitoring the system
- User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- P9500 storage systems 10
- Pair volumes 11
- Journal volumes 11
- Journals 11
- Reference Information 12
- Differential data management 13
- S-VOL write option 14
- Pair status 14
- System requirements 15
- Plan and design workflow 18
- Write-workload 19
- Sizing journal volumes 20
- Planning journals 20
- RAID group configuration 21
- Planning journal volumes 22
- Planning pair volumes 22
- Planning pair volumes 23 23
- Host failover software 25
- Planning for previous models 29
- System option modes 31
- 4 Planning the data path 34
- Calculating bandwidth 35
- 36 Planning the data path 36
- Sizing bandwidth 37 37
- 38 Planning the data path 38
- Packet loss 39
- Example configuration 40
- Port types 40
- Additional switches 41
- 42 Planning the data path 42
- 5 Configuration operations 44
- 46 Configuration operations 46
- 48 Configuration operations 48
- 50 Configuration operations 50
- 52 Configuration operations 52
- 6 Pair operations 54
- Creating the initial copy 55 55
- 56 Pair operations 56
- Creating the initial copy 57 57
- Splitting pairs 58
- Splitting mirrors 59
- Creating point-in-time copies 60
- Resynchronizing pairs 60
- Resynchronizing pairs 61 61
- Resynchronizing mirrors 62
- Deleting pairs 62
- Deleting pairs 63 63
- Deleting pairs in a mirror 64
- Deleting pairs in a mirror 65 65
- 7 Monitoring the system 66
- PSUS types and behaviors 69
- PSUE types and behaviors 71
- Selecting data to be graphed 74
- Manipulating graph, save data 76
- History of pair operations 79
- 8 Maintaining the system 80
- ◦ Initial 81
- ◦ Stopped 81
- ◦ Hold(Failure) 81
- 82 Maintaining the system 82
- 84 Maintaining the system 84
- Logical path maintenance 86
- Deleting logical paths 87
- When power stops unexpectedly 88
- 90 Maintaining the system 90
- General recovery procedures 91
- Cnt Ac-J secondary site: HOLD 100
- 10 Troubleshooting 103
- Troubleshooting logical paths 105
- B9E2, B9E4, D004 109
- B9E4, D004 112
- Miscellaneous troubleshooting 121
- 122 Troubleshooting 122
- Contacting HP 123
- Related information 123
- Typographic conventions 124
- Overview 126
- Failure recovery 127
- B Sharing volumes 133
- Cache Residency 135
- Data Retention 135
- Thin Provisioning 136
- LUN Expansion 137
- LUN Manager 137
- Fast Snap and Snapshot 137
- 138 Sharing volumes 138
- Virtual LUN 139
- Auto LUN 140
- 3DC cascade configuration 141
- Delta resync configuration 144
- ◦ Use the same mirror ID 146
- Problems that can occur 148
- ◦ Assign it to other mirrors 149
- ◦ Use it with RAID Manager 149
- 2 Data center configuration 151
- Pair status and data currency 156
- E GUI reference 157
- Journal Detail window 159
- Pair Operation window 165
- Paircreate dialog box 169
- Pairsplit-r dialog box 171
- Pairresync dialog box 172
- Pairsplit-S dialog box 173
- Change Pair Option dialog box 174
- Display Filter dialog box 174
- DKC Operation window 175
- Remote systems information 176
- Logical Path Information 177
- DKC Status dialog box 179
- Add DKC dialog box 180
- DKC Option dialog box 181
- Usage Monitor window 182
- History window 183
- Operations in History window 184
- History window notes 185
- Optional Operation window 186
- Glossary 188
- 190 Index 190
- 192 Index 192
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