The fix for TS-43: support for drives with hardware sector size of 4096 requires changing the disk layout and therefore clearing the cache.
I was going to check it in to the mainline (see the patch attached to that bug), if there are no objections. Note: this causes a very small fixed increase in the overhead on existing partitions (to align the headers/footers to support sector sizes up to 8k). For partitions formatted to support hardware sector size of more than 512 (e.g. 4096) this will result in all objects stored in the cache to be integral multiples of 4096 bytes which will result in some waste for small files. john
