JFS was designed around a 4K meta-data page size. It would require some
major re-design to use larger block sizes. On the other hand, JFS could
take advantage of 64-bit block addresses immediately. JFS internally
store the block address in 40 bits. (Sorry, file size & volume size are
both limited to 4 peta-bytes on JFS.)
At the rate that storage hardware and requirements are increasing,
increasing the block size is a short-term solution that is only going to
delay the inevitable requirement for 64-bit block addressability. There
is a practical limit to a usable block-size. Someone threw out 64K,
which seems reasonable to me.
-- David Kleikamp IBM Linux Technology Center - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/