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# View SRDF volume pair details

Symmetrix Remote Data Facility (SRDF) facilitates the data replication from one storage system to another through a storage area network or Internet Protocol (IP) network.

## About this task

## Steps

1. Select the storage system.
2. Select Data Protection > SRDF to open the SRDF dashboard.
3. Select a device group from the list and click to open the SRDF Pair List view.
4. On the Local tab, select the pair and click to open its details view.

   The following properties display:

   Device Group —device group ID

   Source Volume—Source volume ID

   Source LDev—Source logical device ID

   SRDF Group—SRDF Group ID

   Remote Array—Remote storage system ID

   Remote SRDF Group—Remote SRDF Group ID

   Target Volume—Target volume ID

   Pair State—Indicates volume pair state.

   SRDF mode—SRDF copy type

   Adaptive Copy Mode—Indicates if adaptive copy mode is enabled.

   Consistency State—Indicates consistency state.

   Consistency Exempt—Indicates when consistency is exempt.

   Link Status—Indicates link state.

   SRDF Domino—Indicates SRDF Domino state.

   SRDF Hop2 Group—SRDF Hop2 Group ID

   Source Volume Invalid R1 Track Count—Number of invalid R1 tracks on source volume

   Source Volume Invalid R2 Track Count—Number of invalid R2 tracks on source volume

   Source Volume SRDF State—Indicates source volume SRDF state.

   Source Volume SRDF Type—Indicates source volume SRDF type.

   Source Volume Track Size—Source volume track size.

   Target Volume Invalid R1 Track Count—Number of invalid R1 tracks on target volume

   Target Volume Invalid R2 Track Count—Number of invalid R2 tracks on target volume

   Target Volume SRDF State—Indicates target volume SRDF state.

   Target Volume Track Size—Target volume track size

   SRDF/A Pacing Capable—Indicates if the SRDF pair allows write pacing capability.

   Configured Group-level Exempt State—Indicates if group-level write pacing exemption capability is enabled or disabled.

   Effective Group-level Exempt State—Indicates if effective group-level write pacing exemption capability is enabled or disabled.

   Group Level Pacing State—Indicates if group level write pacing is enabled or disabled.

   Volume Level Pacing State—Indicates if volume level write pacing is enabled or disabled.

   SRDF/A Consistency Protection—Indicates SRDF/A consistency protection state.

   SRDF/A Average Cycle Time —Average cycle time (seconds) configured for this session

   SRDF/A Minimum Cycle Time—Minimum cycle time (seconds) configured for this session

   SRDF/A Cycle Number—Indicates target volume SRDF state.

   SRDF/A DSE Autostart—Indicates DSE autostart state.

   SRDF/A Session Number—SRDF/A session number.

   SRDF/A Session Priority—Priority used to determine which SRDF/A sessions to drop when the cache becomes full. Values range from 1 to 64, with 1 being the highest priority (last to be dropped).

   SRDF/A Duration Of Last Cycle—The cycle time (in secs) of the most recently completed cycle. It should be noted that in a regular case the cycles switch every 30 sec. However, usually the collection interval is in minutes, which means some cycle times are skipped. This counter is an important counter to look at to figure out if SRDF/A is working as expected.

   SRDF/A Flags—SRDF/A Flags:

   (C) Consistency | X = Enabled, . = Disabled, - = N/A
   (S) Status | A = Active, I = Inactive, - = N/A
   (R) RDFA Mode | S = Single-session, M = MSC, - = N/A
   (M) Msc Cleanup | C = MSC Cleanup required, - = N/A
   (T) Transmit Idle | X = Enabled, . = Disabled, - = N/A
   (D) DSE Status | A = Active, I = Inactive, - = N/A
   DSE (A) Autostart | X = Enabled, . = Disabled, - = N/A

   SRDF/A Uncommitted Track Counts—Number of uncommitted tracks

   SRDF/A Number of Volumes in Session—Number of volumes in session

   SRDF/A Session Uncommitted Track Counts—Number of uncommitted session tracks.

   SRDF/A R1 DSE Used Track Count—Number of tracks used for R1 DSE

   SRDF/A R1 Cache In Use Percent—Percent of R1 cache used

   SRDF/A R1 Shared Track Count—Number of R1 shared tracks

   SRDF/A R1 to R2 Lag Time —Time that R2 is behind R1 (RPO). This time is calculated as the last cycle time plus the time since last switch. In a regular case, the cycles switch every 30 sec and the samples are taken every few minutes. This counter may not show significant data, however, when cycles elongate beyond the sample time, this counter can help indicate an estimate of the RPO.

   SRDF/A R2 DSE Used Track Count—Number of tracks used for R2 DSE

   SRDF/A R2 Cache In Use Percent—Percent of R2 cache used

   SRDF/A Session Minimum Cycle Time—Minimum cycle time (seconds) configured for this session

   SRDF/A Transmit Idle State—Indicates SRDF/A Transmit Idle state.

   SRDF/A Transmit Idle Time—Time the transmit cycle has been idle.

   Suspended State—Suspended state

   Sqar Mode—Indicates if SRDF pair is in a SQAR configuration.

   There are links to views for objects that are contained in and associated with the SRDF group. Each link has a number next to it, indicating the number of objects in the corresponding view. For example, clicking the number next to SRDF Group opens a view listing the volumes that are contained in the SRDF group.