Figure 29 Host interface view and SRDF view of states
Production host
Remote host (optional)
Host interface view
(Read/Write, Read Only (Write Disabled), Not Ready)
Secondary site
SRDF links
Primary site
Open systems host environment
SRDF view
(Ready, Not Ready, Link Blocked)
R1
R2
Host interface view
The host interface view is the SRDF device state as seen by the host connected to the
device.
R1 device states
An R1 device presents one of the following states to the host connected to the
primary array:
l
Read/Write (Write Enabled)—The R1 device is available for Read/Write
operations. This is the default R1 device state.
l
Read Only (Write Disabled)—The R1 device responds with Write Protected to all
write operations to that device.
l
Not Ready—The R1 device responds Not Ready to the host for read and write
operations to that device.
R2 device states
An R2 device presents one of the following states to the host connected to the
secondary array:
l
Read Only (Write Disabled)—The secondary (R2) device responds Write
Protected to the host for all write operations to that device.
l
Read/Write (Write Enabled)—The secondary (R2) device is available for read/
write operations. This state is possible in recovery or parallel processing
operations.
l
Not Ready—The R2 device responds Not Ready (Intervention Required) to the
host for read and write operations to that device.
Remote replication solutions
120 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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