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ca5fd24984
While we initially allowed you to set your ashift as large as 17 (SPA_MAXBLOCKSIZE) that is actually unsafe. What wasn't considered at the time is that each uberblock written to the vdev label ring buffer will be of this size. Now the buffer is statically sized to 128k and we need to be able to fit several uberblocks in it. With a large ashift that becomes a problem. Therefore I'm reducing the maximum configurable ashift value to 12. This is large enough for the 4k sector drives and small enough that we can still keep the most recent 32 uberblock in the vdev label ring buffer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #425 |
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