SRDF view
The SRDF view is composed of the SRDF state and internal SRDF device state. These
states indicate whether the device is available to send data across the SRDF links, and
able to receive software commands.
R1 device states
An R1 device can have the following states for SRDF operations:
l
Ready—The R1 device is ready for SRDF operations.
The R1 device is able to send data across the SRDF links.
True even if local mirror(s) of the R1 device are Not Ready for I/O operations.
l
Not Ready (SRDF mirror Not Ready)—The R1 device is Not Ready for SRDF
operations.
Note
When the R2 device is placed into a Read/Write state to the host, the corresponding
R1 device is automatically placed into the SRDF mirror Not Ready state.
R2 device states
An R2 device can have the following states for SRDF operations:
l
Ready—The R2 device receives the updates propagated across the SRDF links
and can accept SRDF host-based software commands.
l
Not Ready—The R2 device cannot accept SRDF host-based software commands,
but can still receive updates propagated from the primary array.
l
Link blocked (LnkBlk) — Applicable only to R2 SRDF mirrors that belong to R22
devices.
One of the R2 SRDF mirrors cannot receive writes from its associated R1 device.
In normal operations, one of the R2 SRDF mirrors of the R22 device is in this state.
R1/R2 device accessibility
Accessibility of a SRDF device to the host depends on both the host and the array
view of the SRDF device state.
on page 122 list host accessibility for R1 and R2
devices.
Table 42 R1 device accessibility
Host interface state
SRDF state
Accessibility
Read/Write
Ready
Read/Write
Not Ready
Depends on R2 device availability
Read Only
Ready
Read Only
Not Ready
Depends on R2 device availability
Not Ready
Any
Unavailable
Remote replication solutions
SRDF device states
121
Summary of Contents for VMAX 100K
Page 1: ...EMC VMAX3 Family Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS REVISION 6 5 ...
Page 20: ...Preface 20 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 46: ...VMAX3 with HYPERMAX OS 46 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 72: ...Open systems features 72 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 82: ...Provisioning 82 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 158: ...Remote replication solutions 158 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 186: ...Mainframe Error Reporting 186 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...
Page 200: ...Licensing 200 Product Guide VMAX 100K VMAX 200K VMAX 400K with HYPERMAX OS ...