On Sat, Feb 28, 2015 at 12:33 AM, Robert Arkiletian robark@gmail.com wrote:
According to this pdf [1] alignment is important but from what I understand 512e emulation still has a small RMW performance hit from writes that are smaller than 4k or if the writes are not a multiple of 4k.
There shouldn't be writes smaller than 4KB since ext234, XFS, and Btrfs all use 4KB block sizes. There is a possible case where the XFS journal writes are 512 bytes, this can be fixed by specifying a 4KB sector size at mkfs time if it's not auto-detected.
Also it's probably not a good idea to mix 512e with 512n in a raid set.
Scrambled eggs mixed with yogurt? Offhand it doesn't seem like a bad idea (won't kill me), even if it also may not be a good idea (sounds suboptimal).