Brocade Communications Systems WFT-2D User Manual page 1008

22
Connecting cascaded FICON fabrics over FCIP
TABLE 77
Manufacturer
EMC
EMC
HDS
HDS
HP
*
Compression mode
More aggressive compression modes can be used for asynchronous mirroring. For synchronous
mirroring, only hardware or standard compression should be used. This is because more
aggressive algorithms work by receiving additional frames to find compressible patterns on larger
blocks of data. The time it takes to read in these additional frames add latency, which may not be
tolerated by synchronous mirroring. Set compression modes on the Add FCIP Tunnel dialog box.
Circuit Keep Alive Time Out values
The circuit Keep Alive Time Out value, located on the Transmission tab of FCIP Circuit Advanced
Settings dialog box, should be less than the protocol timeout for the application being extended.
This allows circuit failover to be non-disruptive. By default, the circuit keep alive is 10 seconds
(10000 ms) and 1 second (1000 ms) for FICON. Set this to 6 seconds (6000 ms) for IBM
peer-to-peer remote copy (PPRC). All other applications should use the default.
SRDF considerations
Use SRDF/S SiRT (Single Roundtrip) or SRDF/A with FCIP-FW but not both. Using SRDF/A and
SRDF/S on the same remote adapter (RA) ports on the array is not recommended. Use different
VE_Ports for the tunnels, as if the tunnel destinations are different. If there is only one destination
(SRDF/A and SRDF/S are going to the same place), isolate traffic from the SRDF/A and SRDF/S RA
ports using TI zones and configure the tunnels accordingly. Note that there may be differences in
bandwidth, Fast Write, and compression mode tunnel parameters.
956
Using Fast Write for extended applications
RDR Application Platform
MirrorView CLARiiON
SANcopy CLARiiON
Universal Replicator All
(HUR)
TrueCopy All
Continuous Access EVA
OSTP Tape
Type Use Fast Write
Sync Yes
Async Yes
Async No
Async No
Hybrid No
Tape Yes (required for OSTP)
Brocade Network Advisor SAN User Manual
53-1003154-01