I/O function chunk mm, pagenum nn, pagecnt aa --> errno = bb.


An operating-system error occurred during an attempt to access data from disk space. The operating-system function that failed is defined by function. The chunk number and physical address of the page where the error occurred are displayed as integers. The pagecnt value refers to the number of pages that the thread was attempting to read or write. If an errno value is displayed, it is the number of the operating-system error and might explain the failure. If function is specified as bad request, some unexpected event caused the I/O attempt on an invalid chunk or page.


If the chunk status changes to D, or down, restore the chunk from its mirror or repair the chunk. Otherwise, perform a data restore.

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