On 04.01.2015 21:52, Stan Hoeppner wrote: > On 01/04/2015 06:56 PM, Hillel Lubman wrote: > ... > > Looking around I saw some references that it's preferable to use sector > > size (sectsz) of 4 KB when creating XFS partitions on hybrid (512e) > > advanced format hard drives and also some mentions of making that a > > default in mkfs.xfs. However I noticed that my current mkfs.xfs (3.2.1) > > used with current Debian testing (Linux 3.16.0) still uses 512 B sectors > > by default. > ... > > Can you please clarify what after all is the recommended sector size for > > such drives and why isn't it a default in mkfs.xfs (since supposedly > > defaults are generally recommended optimal settings unless you have some > > special use case). > ... > > XFS sectsz is unimportant with these drives. What matters is that any > partitions you create start and end on 4KB boundaries. This will > prevent adjacent hardware sector RMW internal to the drive. XFS writes > in 4KB filesystem blocks on Linux. As long as the fsblocks are aligned > to the 4KB hardware sectors there's nothing more you can do to avoid > performance penalties with these drives. Not in my experience. My first (and lying about it) AF HDD had horrible write performance until i re'mkfs.xfs'ed it with 4k sector-size. And yes the aligned was 4k. But that was many years ago and i don't know if newer XFS (IIRC that was before delay-log) would behave better. But as all of my storage after the first AF HDD was either an AF HDD or a SSD i have been formating everything with 4k sector-size for years. -- Matthias _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
