Intro to SRDF: SRDF Control Operations

2 - SRDF Control Operations

covers the SRDF control operations that enable you to establish, manage and view components comprising an SRDF configuration.

Overview

Most SRDF control operations are performed by the arguments specified in the symrdf command.
Table 5 lists each SRDF control operation, the argument to use to perform that control action, and its result. The next section,“SRDF control operations” on page 44, provides explanations and examples of each control operation, and are presented alphabetically.
Table 5: SRDF Control Operations
Activate SRDF/A write pacing
Deactivate SRDF/A write pacing
page 45
activate -rdfa_wpace
deactivate -rdfa_wpace
activate -rdfa_devpace
deactivate -rdfa_devpace
Activates or deactivates SRDF/A group-level and device-level write
pacing, which extends the availability of SRDF/A by preventing
conditions that result in cache overflow on both the R1 and R2
sides.The SRDF/A session must be active to activate SRDF/A write
pacing.
Cleanup incomplete SRDF/A data
page 45
msc_cleanup Initiates a cleanup operation to discard any incomplete SRDF/A data
to maintain dependent write consistency.
Create SRDF pairs
page 46
createpair Creates the dynamic SRDF pairs specified in the device file.
Note: If the RA ends up supporting more than 64K devices in either
one of the RDF groups, this operation fails.
Delete SRDF pairs
page 46
deletepair Deletes the SRDF pairs.
Delete one-half of an SRDF pair
page 46
half_deletepair Deletes one-half of the designated dynamic SRDF pair.
Enable consistency protection
Disable consistency protection
page 47
enable
disable
Enables or disables consistency protection for SRDF/A capable
devices.
Establish an SRDF pair (full)
page 47
establish -full Establishes remote mirroring and initiates a full data copy from the
source (R1) device to the target (R2) device.
Establish an SRDF pair (incremental)
page 49
establish Establishes remote mirroring and initiates an incremental data copy
from the source (R1) device to the target (R2) device.
Failback
page 51
failback Switches data processing from the target side (R2) back to the
source (R1) side.
Failover
page 53
failover Switches data processing from the source (R1) side to the target
(R2) side.
Invalidate R1 mirror
page 55
invalidate r1 Invalidates all tracks on the source (R1) side so that they can be
copied over from the target (R2) side.
Invalidate R2 mirror
page 55
invalidate r2 Invalidates all tracks on the target (R2) side so that they can be
copied over from the source (R1) side.

Control operation	symrdf action arguments	Results
Activate SRDF/A DSE Deactivate SRDF/A DSE page 44	activate -rdfa_dse deactivate -rdfa_dse	Activates or deactivates SRDF/A DSE, which extends the available cache space by using device SAVE pools.