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Remote replication disaster recovery - array

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• Queued replications: New replications can be initiated while other replication snapshots are in the process of being replicated. This enables you to take snapshots at specific intervals while other replications are ongoing. Note that a replication that is initiated while another to the same destination volume is ongoing will be queued, and will not begin to transfer data until the prior one completes. In action 3, Snap 2 is queued while Snap 1 is being replicated; in action 7, Snap 3 is queued while Snap 2 is being replicated. An in-progress replication can be suspended, either manually by a user or automatically if a network error occurs. If you want the replication to continue, you must manually resume it; or, if you want to cancel the replication, you can abort it. IMPORTANT: For a replication to begin, the controller that owns the destination volume must have a link to the controller that owns the source volume. This link must be of the type specified by the link-type parameter supplied during replication set creation or modification. If all links to the controller that owns the source volume fail, but links remain between its partner controller and the controller that owns the destination volume, replications currently in progress or queued may continue, but their progress may not be reported correctly; replications requested after the links fail will not start replicating. If the controller that owns the destination volume loses all links to both controllers of the source array, then the replications will suspend and progress will be updated appropriately; links from the partner controller of the controller that owns the destination volumes are not considered for use. Replications that enter the suspended state must be resumed manually. Remote replication disaster recovery Replication can continue in the event of system faults such as: • Temporary communication failure. Remote replication will retry replication operations according to user-configured policies. • Controller failure. In a dual-controller system, failover will occur and the surviving controller will take over replication processing until controller recovery occurs. • Disk or power supply failure. If a disaster causes the source volume to become inaccessible, you can move the external view to the replication destination volume so that volume can be mapped to hosts. Disaster recovery requires user intervention because decisions must be made based on the data content of replication volumes and their snapshots. 1. Synchronize the replication destination volume to a replication snapshot, preferably a replication sync point. Any data written to the source volume since the last-completed replication will not be available. 2. After synchronization, assign the external view to the replication destination volume. 3. Map the new external view to hosts, as was the original external view. 104 Using Remote Snap to replicate volumes

Section	Page
Contents	3
Figures	9
Tables	11
About this guide	13
Intended audience	13
Prerequisites	13
Related documentation	13
Document conventions and symbols	14
HP technical support	14
Product warranties	15
Subscription service	15
HP web sites	15
Documentation feedback	15
Getting started	17
Configuring and provisioning a new storage system	17
Browser setup	17
Signing in	18
Tips for signing in and signing out	18
Tips for using the main window	18
Tips for using the help window	19
System concepts	20
About user accounts	20
Related topics	21
About vdisks	21
Related topics	22
About spares	22
Related topics	22
About volumes	23
Related topics	23
About hosts	23
Related topics	24
About volume mapping	24
Related topics	25
About volume cache options	25
Using write-back or write-through caching	25
Optimizing read-ahead caching	25
Related topics	26
About managing remote systems	26
Related topics	26
About the Snapshot feature	27
Related topics	28
About the Volume Copy feature	29
Related topics	30
About the VDS and VSS hardware providers	30
About RAID levels	30
About size representations	32
Related topics	32
About the system date and time	33
Related topics	33
About storage-space color codes	33
About Configuration View icons	34
About vdisk reconstruction	34
About data protection in a single-controller storage system	35
Configuring the system	37
Using the Configuration Wizard	37
Step 1: Starting the wizard	37
Step 2: Changing default passwords	37
Step 3: Configuring network ports	37
Step 4: Enabling system-management services	38
Step 5: Setting system information	38
Step 6: Configuring event notification	38
Step 7: Configuring host ports	39
Step 8: Confirming configuration changes	40
Installing a license	40
Configuring system services	41
Changing management interface settings	41
Configuring email notification	42
Configuring SNMP notification	42
Configuring user accounts	43
Adding users	43
Modifying users	43
Removing users	44
Configuring system settings	45
Changing the system date and time	45
Changing host interface settings	45
Changing network interface settings	47
Setting system information	47
Configuring advanced settings	48
Changing disk settings	48
Configuring SMART	48
Configuring drive spin down for available disks and global spares	48
Configuring dynamic spares	48
Configuring the EMP polling rate	49
Changing system cache settings	49
Changing the synchronize-cache mode	49
Changing the missing LUN response	49
Controlling host access to the system's write-back cache setting	50
Changing auto-write-through cache triggers and behaviors	50
Configuring partner firmware update	51
Configuring system utilities	51
Configuring background scrub	51
Configuring utility priority	51
Configuring remote systems	52
Adding a remote system	52
Removing a remote system	52
Configuring a vdisk	52
Managing dedicated spares	52
Changing a vdisk's name	53
Changing a vdisk's owner	53
Configuring vdisk drive spin down	53
Configuring a volume	54
Changing a volume's name or OpenVMS UID	54
Changing a volume's cache settings	54
Configuring a snapshot	55
Changing a snapshot’s name	55
Configuring a snap pool	55
Changing a snap pool’s name	55
Provisioning the system	57
Using the Provisioning Wizard	57
Step 1: Starting the wizard	57
Step 2: Specifying the vdisk name and RAID level	57
Step 3: Selecting disks	58
Step 4: Defining volumes	58
Step 5: Setting the default mapping	59
Step 6: Confirming vdisk settings	59
Creating a vdisk	59
Deleting vdisks	60
Managing global spares	60
Creating a volume set	61
Creating a volume	61
Deleting volumes	62
Changing default mapping for multiple volumes	62
Explicitly mapping multiple volumes	63
Changing a volume's default mapping	64
Changing a volume's explicit mappings	64
Unmapping volumes	65
Expanding a volume	65
Creating multiple snapshots	66
Creating a snapshot	66
Deleting a snapshot	67
Resetting a snapshot	67
Creating a volume copy	68
Aborting a volume copy	69
Rolling back a volume	69
Creating a snap pool	70
Deleting snap pools	70
Adding a host	71
Removing hosts	71
Changing a host's name	71
Changing host mappings	72
Configuring CHAP	72
Modifying a schedule	73
Deleting schedules	74
Using system tools	75
Updating firmware	75
Updating controller module firmware	75
Updating expansion module firmware	76
Updating disk firmware	76
Saving logs	77
Resetting a host port	78
Rescanning disk channels	78
Restoring system defaults	78
Clearing disk metadata	78
Restarting or shutting down controllers	79
Restarting	79
Shutting down	79
Testing event notification	80
Expanding a vdisk	80
Before expanding a vdisk	80
Verifying a vdisk	81
Scrubbing a vdisk	81
Removing a vdisk from quarantine	82
Expanding a snap pool	82
Checking links to a remote system	83
Viewing system status	85
Viewing information about the system	85
System properties	85
Enclosure properties	85
Disk properties	85
Vdisk properties	85
Volume properties	85
Snap-pool properties	85
Snapshot properties	86
Schedule properties	86
Configuration limits	86
Licensed features	86
Version properties	86
Viewing the system event log	86
Viewing information about all vdisks	87
Viewing information about a vdisk	88
Vdisk properties	88
Disk properties	89
Volume properties	90
Snap-pool properties	90
Viewing information about a volume	90
Volume properties	90
Mapping properties	90
Schedule properties	91
Viewing information about a snapshot	92
Snapshot properties	92
Mapping properties	92
Schedule properties	92
Viewing information about a snap pool	93
Snap-pool properties	93
Volume properties	94
Snapshot properties	94
Viewing information about all hosts	94
Viewing information about a host	94
Host properties	94
Mapping properties	95
Viewing information about an enclosure	95
Enclosure properties	95
Disk properties	96
Power supply properties	97
Fan properties	97
Controller module properties	97
Controller module: network port properties	98
Controller module: host port properties	98
Controller module: expansion port properties	98
Controller module: CompactFlash properties	99
Drive enclosure: I/O module properties	99
I/O module: In port properties	99
I/O module: Out port properties	99
Viewing information about a remote system	100
Using Remote Snap to replicate volumes	101
About the Remote Snap replication feature	101
Replication actions	103
Remote replication disaster recovery	104
Remote replication licensing	105
Related topics	105
Using the Replication Setup Wizard	106
Step 1: Starting the wizard	106
Step 2: Selecting the source volume	106
Step 3: Selecting the replication mode	106
Step 4: Selecting the destination volume	107
Step 5: Confirming replication settings	107
Replicating a volume	107
Replicating a snapshot	108
Removing replication from a volume	109
Suspending replication	109
Resuming replication	109
Aborting replication	110
Detaching a replication volume	110
Reattaching a replication volume	110
Exporting a replication image to a snapshot	111
Changing the external view for a replication set	111
To change the external view to the destination volume	111
To change the external view back to the source volume	111
Viewing replication addresses and images for a volume	112
Replication addresses	112
Replication images	112
Viewing information about a replication volume	112
Replication properties	113
Replication addresses	113
Replication image properties	113
Viewing information about a replication image	113
Replication status properties	113
Source snapshot properties	113
Destination snapshot properties	114
SNMP reference	115
Standard MIB-II behavior	115
Enterprise traps	115
FA MIB 2.2 SNMP behavior	116
External details for certain FA MIB 2.2 objects	121
External details for connUnitRevsTable	121
External details for connUnitSensorTable	122
External details for connUnitPortTable	123
Configuring SNMP event notification in SMU	123
SNMP management	123
Enterprise trap MIB	123
FA MIB 2.2 and 4.0 differences	126
Using FTP to download logs and update firmware	127
Downloading system logs	127
Updating controller module firmware	128
Updating expansion module firmware	129
Updating disk firmware	131
Installing a license file	132
Glossary	133

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104

Using Remote Snap to replicate volumes

•

Queued replications: New replications can be initiated while other replication snapshots are in the

process of being replicated.

This enables you to take snapshots at specific intervals while other

replications are ongoing.

Note that a replication that is initiated while another to the same destination

volume is ongoing will be queued, and will not begin to transfer data until the prior one completes. In

action 3, Snap 2 is queued while Snap 1 is being replicated; in action 7, Snap 3 is queued while Snap

2 is being replicated.

An in-progress replication can be suspended, either manually by a user or automatically if a network error

occurs. If you want the replication to continue, you must manually resume it; or, if you want to cancel the

replication, you can abort it.

IMPORTANT:

For a replication to begin, the controller that owns the destination volume must have a link

to the controller that owns the source volume. This link must be of the type specified by the link-type

parameter supplied during replication set creation or modification. If all links to the controller that owns the

source volume fail, but links remain between its partner controller and the controller that owns the

destination volume, replications currently in progress or queued may continue, but their progress may not

be reported correctly; replications requested after the links fail will not start replicating. If the controller that

owns the destination volume loses all links to both controllers of the source array, then the replications will

suspend and progress will be updated appropriately; links from the partner controller of the controller that

owns the destination volumes are not considered for use. Replications that enter the suspended state must

be resumed manually.

Remote replication disaster recovery

Replication can continue in the event of system faults such as:

•

Temporary communication failure. Remote replication will retry replication operations according to

user-configured policies.

•

Controller failure. In a dual-controller system, failover will occur and the surviving controller will take

over replication processing until controller recovery occurs.

•

Disk or power supply failure.

If a disaster causes the source volume to become inaccessible, you can move the external view to the

replication destination volume so that volume can be mapped to hosts. Disaster recovery requires user

intervention because decisions must be made based on the data content of replication volumes and their

snapshots.

Synchronize the replication destination volume to a replication snapshot, preferably a replication sync

point. Any data written to the source volume since the last-completed replication will not be available.

After synchronization, assign the external view to the replication destination volume.

Map the new external view to hosts, as was the original external view.