April 2014 Archives

ext3, pvgrub and "block error -1 for op 0"

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For testing purposes I was creating a large number of instances with very small root file systems. The partitions were formatted using ext3. About one out of twenty would fail to decompress bzImage with the message "block error -1 for op 0".  The files were all read correctly when the partition was mounted in the dom0.

When I increased the disk size from 32MiB to 64MiB and the partition size to 63MiB, the problem went away.  I also made sure the ratio between inodes and blocks was an integer number though this didn't seem to help.

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