C.1 iostat Command
C.1 iostat Command
The iostat command is used to regularly report the CPU usage status, as well as the terminal status, drive status, and I/O status.
Table C-1 lists the options of the iostat command and how these options are useful for troubleshooting the system.
Table C-1 lists the options of the iostat command and how these options are useful for troubleshooting the system.
Option | Description | Application |
---|---|---|
No options | Reports the status of the local I/O device. | Allows you to view the device status concisely in 3 lines. |
-c |
Reports, as ratios, the length of time that the system has been in user mode, in system mode, waiting for I/O, and idling. | Allows you to view the CPU status as a concise report. |
-e |
Displays a summary of statistics on device errors. The displayed items are the total number of errors, hardware errors, software errors, and transfer errors. | Allows you to view the accumulated number of errors as a concise table and identify potentially failed I/O devices. |
-E |
Displays statistics on all the device errors. | Allows you to view device information (manufacturer, model number, serial number, size, and errors). |
-n |
Displays the names in a descriptive form. | Allows you to identify devices with a descriptive display. |
-x |
Reports the extended drive statistics of individual drives. Statistics are output in table format. Similar to the -e option, but differs in that it provides rate information. |
Allows you to find internal devices and other I/O devices on the network whose performance is low. |
The following example shows the output from the iostat command.
# iostat -En c5t50000393D85129FAd0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: TOSHIBA Product: MBF2300RC Revision: 3706 Serial No: EB25PC201AL6 Size: 300.00GB <300000000000 bytes> Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 Illegal Request: 0 Predictive Failure Analysis: 0 c3t50000393D851FDAAd0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: TOSHIBA Product: MBF2300RC Revision: 3706 Serial No: EB25PC201AMS Size: 300.00GB <300000000000 bytes> Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 Illegal Request: 0 Predictive Failure Analysis: 0 c4t50000393D822D2B6d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: TOSHIBA Product: MBF2300RC Revision: 3706 Serial No: EB25PC2015P8 Size: 300.00GB <300000000000 bytes> Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 Illegal Request: 0 Predictive Failure Analysis: 0 c2t50000393E8001BB6d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: TOSHIBA Product: MBF2300RC Revision: 3706 Serial No: EB25PC301AV6 Size: 300.00GB <300000000000 bytes> Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 Illegal Request: 0 Predictive Failure Analysis: 0 # |
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