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Troubleshooting and Error Messages Guide |
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| Chapter 3 Error Message Writeups |
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| Disk Errors |
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| Error 5142 |
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Mirroring for device '%.*s' is not currently enabled.
Error 5142 is raised when you execute a disk unmirror command in retain mode, but the device in question is not currently mirrored.
Disk mirroring is automatically deactivated when a read or write to a mirrored device fails. You may see Error 5142, possibly accompanied by additional messages at the console or in the error log:
if there are transient device failures
if the mirror was set up improperly, for example if an incorrect device name was specified.
Take the following steps:
Look at the server error log. Check for additional errors preceding the 5142 error to determine the probable cause. For example, a udunmirror kernel error indicates a physical disk problem leading to I/O failure; for corrective action, refer to the writeup for udunmirror Errors in this manual.
If the device was recently mirrored or remirrored, check the procedure used to set up the mirror. Since a database device and its mirror constitute one logical device, you should not initialize the mirror device with disk init. Also check the syntax used for the disk mirror command, ensuring that the path to the mirror is properly specified. Finally, check disk configuration and make sure the disk is properly labeled.
To retain use of asynchronous I/O, always mirror devices that are capable of asynchronous I/O to other devices capable of asynchronous I/O. In most cases, this means mirroring raw devices to raw devices and operating system files to operating system files.
Refer to "Initializing Mirrors" in the System Administration Guide for details.
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