Hi This is series of 4 patches that fix flaws with 4k sectors and snapshots. The first flaw is bad iterate devices (it can hurt even with 512-byte sectors, if the snapshot and origin are at devices with different limits). The next two patches just prepare things for the 4th patch. The 4th patch extends the chunk size test for both the snapshot and the origin --- i.e. chunk size must be greater than or equal to both snapshot and origin sector size. Previously, the test was only for the snapshot, thus if you had origin with large sector and snapshot with small sector, it would fail copying the small chunk from the origin to the snapshot. BTW. if anyone wants to test his code with non-512-byte sector devices, you can use old Seagate U160 SCSI disks (Cheetah XL and before), they can be reformatted to 512-4096 byte sectors with sg_format command. They are no longer being manufactured, you can find them at internet auctions. The current U320 SCSI disks (Cheetah 10K.X or 15K.X) don't support large sectors, they only support 512-528 byte sector-size. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
