On Nov 10, 2011, at 7:47 PM, David Magda wrote: > On Nov 10, 2011, at 18:41, Daniel Carosone wrote: > >> On Tue, Oct 11, 2011 at 08:17:55PM -0400, John D Groenveld wrote: >>> Under both Solaris 10 and Solaris 11x, I receive the evil message: >>> | I/O request is not aligned with 4096 disk sector size. >>> | It is handled through Read Modify Write but the performance is very low. >> >> I got similar with 4k sector 'disks' (as a comstar target with >> blk=4096) when trying to use them to force a pool to ashift=12. The >> labels are found at the wrong offset when the block numbers change, >> and maybe the GPT label has issues too. > > Anyone know if Solaris 11 has better support for detecting the native block > size of the underlying storage?
Better than ? If the disks advertise 512 bytes, the only way around it is with a whitelist. I would be rather surprised if Oracle sells 4KB sector disks for Solaris systems… -- richard -- ZFS and performance consulting http://www.RichardElling.com LISA '11, Boston, MA, December 4-9 _______________________________________________ zfs-discuss mailing list firstname.lastname@example.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss