Interfaces performance

The Interfaces graph displays data points for Fibre Channel (FC), iSCSI, serial-attached SCSI (SAS), and IP Remote Copy interfaces for both compressed and non-compressed connections. You can use this information to help determine connectivity issues that might impact performance. The Fibre Channel interface includes read and write workloads from Fibre Channel hosts and remote-copy replications from other systems.

The Fibre Channel interface is also used to communicate within the system. The iSCSI interface is used for read and write workloads from iSCSI-attached hosts. The SAS interface is used for read and write operations to drives. The SAS interface can show activity even when there is no incoming workload on the Fibre Channel or iSCSI interfaces due to FlashCopy® operations or background RAID activity, such as data scrubbing and array rebuilding. The workload on the SAS interface can also be higher than the workload from hosts because of the additional write operations that are necessary for the different RAID types. For example, a write operation to a volume that is using a RAID-10 array requires twice the amount of the SAS interface bandwidth to accommodate the RAID mirroring. The IP Remote Copy interface displays read and write workloads for Remote Copy traffic over IP connections. The IP Remote Copy (Compressed) interface displays read and write workloads for Remote Copy traffic over compressed IP connections. Data is compressed as it is sent between systems in the remote copy partnership. Compression for remote copy can reduce the amount of bandwidth that is required for the IP connection. Compression must be enabled on both systems in the remote-copy partnership to compress data over the IP connection.