Hello, everyone.
Today, I'd like to share with you the FastWrite function of HyperMetro and HyperReplication.
HyperMetro and HyperReplication employ the FastWrite function to optimize the data transfer protocol between storage arrays. With SCSI's First Burst Enabled function, the interaction times of write data on a link are reduced by half during transfer.
In a normal SCSI process, a write I/O undergoes multiple interactions between the two transfer ends, such as write command delivery, write address allocation completion, data write, and write execution status return. FastWrite optimizes the write I/O interaction process, combines command delivery and data write, and cancels the interaction process of write address allocation completion, reducing the interactions of a cross-site write I/O by half.
The FastWrite function of OceanStor Dorado 6.X.X is enabled or disabled as follows:
It is recommended that you enable FastWrite when the Fibre Channel network between two sites spans over 10 km. To enable FastWrite, run the change port fc fc_port_id=XXX fast_write_enable=yes command on both the local and remote storage systems. Then run the show port general port_id=XXX command. If Fast Write Enable in the command output is Yes, FastWrite has been enabled successfully.
On an IP replication network, FastWrite has been enabled by default.
