SRDF/A Performance parameters
Beginning with Solutions Enabler version 6.0 and Enginuity version 5x71, you can use the Configuration Manager to set the following SRDF/A performance parameters
- Maximum amount of cache that SRDF/A can use
- Maximum host throttle time
- Minimum cycle time
- SRDF/A group priority
Displaying SRDF/A Metric Information
Beginning with Solutions Enabler version 6.0 and Enginuity version 5x71, the symstat command can display SRDF/A metric information about cache utilization, session cycles, and host/RDF throughput. For example, to display the total cache utilization for all SRDF/A sessions that are active (or have non-zero cache usage) on Symmetrix 202, use the symstat -type cache command:
- symstat -i 10 -sid 204 -type cache -RepType rdfa
SRDF/A Session Cache Summary Information
Symmetrix ID : 000292602204
Timestamp : 16:23:06
System Write Pending Limit : 1113996 (67.99 GB) <<<< Means amount of cache slots per volume + Each slot is 64KB
Cache Slots available for all SRDF/A sessions : 835497 (50.99 GB)
Total Local Write Pending Count : 0
Total System Write Pending Count : 13231
Total System SRDF/A DSE Used Tracks : 0 (0.00 GB)
Total System Cache Slots In Use : 0 (0.00 GB)
Total System Cache Slots Shared : 0 (0.00 GB)
Total System Cache Full Percentage : 0.0
Session Rdfa DSE Cache Slots
-------- --------------- --------------------- Cache
RA Flgs Full
Device Group Name Grp TAS Pri Thr UsedTrks In Use Shared (%)
----------------- --- ---- --- --- ----------- ----------- --------- -----
srdf_aixgold 2 1YA 33 50 0 0 0 0.0
Legend for Session Flags:
T(ype) : 1 = RDF1, 2 = RDF2
A(SYNC) : Y = Yes, N = No
S(tatus) : A = Active, I = Inactive, - = N/A
Options include specifying only one SRDF/A session (-session #), all configured sessions (-all) whether active or inactive, or just R1- or R2-side sessions (-rdf1 or -rdf2).
- To display cycle information for all SRDF/A sessions that are active (or have non-zero cache usage): symstat -sid 204 -type cycle -RepType rdfa
- symstat -i 10 -sid 204 -type cycle -RepType rdfa
SRDF/A Session Cycle Summary Information
Symmetrix ID : 000292602204
Timestamp : 16:25:17
Session Cycle Time (sec) Cycle Size
----------- ------------------- -----------------------
RA FLGS Active Last
Device Group Name Grp TAS Cycle# Min Avg Last Switch Active Inact Shared
----------------- --- ---- ------ --- --- ---- ------ ------- ------- -------
srdf_aixgold 2 1YA 34188 15 15 15 2 0 0 0
Legend for Session Flags:
T(ype) : 1 = RDF1, 2 = RDF2
A(SYNC) : Y = Yes, N = No
S(tatus) : A = Active, I = Inactive, - = N/A
Legend for the Attribute of Cycle Size:
RDF1: Active = Capture Inactive = Transmit
RDF2: Active = Apply Inactive = Receive
- To display host and RDF throughput information for all SRDF/A sessions that are active (or have non-zero cache usage) on a Symmetrix (sid 202), or for a specific device group (grp1), specify -type requests:
symstat -i 10 -sid 204 -type requests -RepType rdfa
SRDF/A Session Throughput Summary Information
Symmetrix ID : 000292602204
Timestamp : Thu Jan 03 2013 16:25:51
SRDF/A Session Throughput Summary Information
Symmetrix ID : 000292602204
Timestamp : Thu Jan 03 2013 16:26:01
Host Write Workload RDF Throughput R1->R2
RA Session ------------------- ----------------------
Device Group Name Grp Number IO/sec MB/sec IO/sec MB/sec
----------------- --- ------- -------- --------- ---------- ----------
srdf_aixgold 2 1 0 0.0 0 0.0
- symstat -i 10 -dg srdf_aixgold -type requests -RepType rdfa
SRDF/A Session Throughput Summary Information
Symmetrix ID : 000292602204
Timestamp : Thu Jan 03 2013 16:38:06
SRDF/A Session Throughput Summary Information
Symmetrix ID : 000292602204
Timestamp : Thu Jan 03 2013 16:38:16
Host Write Workload RDF Throughput R1->R2
RA Session ------------------- ----------------------
Device Group Name Grp Number IO/sec MB/sec IO/sec MB/sec
----------------- --- ------- -------- --------- ---------- ----------
srdf_aixgold 2 1 0 0.0 0 0.0