Interpret the Devices screen for Adaptive Server.
The Devices table displays information about all devices that store databases for this Adaptive Server. A device can be a whole disk drive, or any part of a disk or file system. The charts are populated by data from collection_ase_all_client_kpis, covering the current trend period.
The Devices table includes device semaphore statistics. The device semaphore controls access to device I/O; a high ratio of Device Semaphore Waits to Device Semaphore Requests indicates contention. If IO Wait Time is high enough to cause concern, you may want to redistribute the data on the physical devices.
The tabs at the bottom of the screen show information about the device selected in the Devices table.
Details | Displays two charts:
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Advanced | Displays two charts:
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IO Distribution | Appears only for Global Devices on Adaptive Server shared-disk clusters. Details for master device I/O activities for each instance include I/O wait time, response time, APF reads and request and wait times for device semaphores. |