IBM announced the general availability of the Storage DS8A00
This is a significant leap in hardware capacity and performance that is in line with your new needs for the near future and fits well with new AI projects.
But 7.37 PETA is huge, the new high-tech hardware components of the z series will manage this space well, but your z OS disk manager will probably have to be more vigilant on the I/O performance aspect because each client is different and especially in the Back-End of the z OS disk arrays. This is why we added a new feature in EADM (ESSM release 2).
Between 1970 and 2024 something has not changed is the composition of a z OS disk response time ( Response Time = Connect Time + Disc Time + Pending Time + IOSQ) and this despite the recent virtualization of the Back-End, the information of the ''Response Time Disc'' therefore always remains important.
The creation of this ''Response Time Disc'' value comes from the RMF CMF reports following the analysis of the SMF Binary files. It is the SENSE TEST I/O CCW which feeds the SMF74 records.
The CCW (Channel Command Word) is a key element in the IBM mainframe architecture, particularly in the management of input/output. A CCW is a command that tells the control channel how to interact with storage or input/output devices.
The SENSE TEST I/O command is a type of CCW command used to test and retrieve the status of an IBM, HITACHI, or DELL EMC z OS disk subsystem. Here are some key points about this command:
1. Functionality : It allows the system to query the status of an I/O device, which can be useful for diagnostics or error handling.
2. Usage : When a system sends a SENSE command to a device, it receives detailed information about the device's operational status, which may include data about errors, capabilities, or alerts.
3. Importance for management : This allows administrators to better understand potential issues with devices and take corrective actions if necessary.
