ad0: TIMEOUT messages

You may see kernel messages that would suggest disk access errors when viewing dmesg. For example,

Jul 2 01:23:23 example kernel: ad0: TIMEOUT -
Jul 2 01:24:04 example kernel: WRITE_DMA retrying (1 retry left) LBA=10081311
Jul 2 01:24:04 example kernel: ad0: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=13468479

These messages are a result of the virtual hardware which Xen provides your virtual machine and are not indicative of any issues with either your disk or system. They can safely be ignored and do not affect data integrity or system stability in any way.

 

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