On Wed, May 29, 2019 at 12:19 AM <michael@xxxxxxxxxxxxx> wrote: > > Am 2019-05-29 09:09, schrieb Xiao Ni: > > On 05/29/2019 12:21 AM, Song Liu wrote: > >> On Sun, May 26, 2019 at 2:27 AM Matthew Moore <matthew@moore.sydney> > >> wrote: > >>> Hi all, > >>> > >>> I'm setting up a RAID6 array on 8 * 8TB drives, which are obviously > >>> using 4k sectors. The high-level view is XFS-on-LUKS-on-mdraid6. > >> Are these driver 4kB native or 512e? > > > > Hi Song > > > > What's the meaning of "4kB native" and "512e" here? > > The sector size is 4kB or 512 byte? > > > >> > >> For 4kB native, you don't need to do anything. > >> > >> For 512e, just make sure NOT to create RAID on top of non-4kB-aligned > >> partitions. > > > > Could you explain more about this? > > > > Regards > > Xiao > > Hello, > > 4kB = they expose their 4k sectors also at the interface. > 512e = internally, they use (in far the most cases) 4kB sectors > internally, but emulate 512 byte sectors at the interface. Which can > make things slow if structures are not aligned at 4kB boundaries. > > Best regards, > Michael Fritscher Thanks Michael! That's exactly what I meant. Song
