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d4aae2a054
When adding or replacing a vdev with a different sector size the error message should be more useful. In addition to describing the problem provide a hint that the '-o ashift' option can be used to override the optimal default value. Since using a non-optimal value may incur a significant performance penalty we should issue this error. But there a numerous reasons why a administrator may wish to do this anyway. Signed-off-by: Niklas Edmundsson <ZNikke@github> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2421