On Thu, Jun 5, 2014 at 5:06 PM, John R Pierce <pierce at hogranch.com> wrote: > On 6/5/2014 2:50 PM, Les Mikesell wrote: >> New bigger disks may use 4k physical sectors but report 512 for >> backwards compatibility. If you don't write 4 contiguous sectors it >> has to read, wait for the disk to spin back around, then write, >> merging in what you did write. Which means writes will be very slow >> if your partitions are not aligned on 4k boundaries. I haven't had to >> deal with many of these yet so I've mostly just installed gparted from >> epel and used its defaults rather than doing the math myself. > > some new disks even report they are 4K and allow 4K sector operations, > which file systems like XFS support natively. This is going to be > increasingly common going forwards. > > [btw, thats 8 consecutive 512B sectors for 4K] > Ummm, yeah.... That's why I let gparted do the math. -- Les Mikesell lesmikesell at gmail.com