On Fri, Nov 11, 2011 at 09:55:29PM -0800, Richard Elling wrote: > 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? >
Afaik the disks advertise both the physical and logical sector size.. at least on Linux you can see that the disk emulates 512 bytes/sector, but natively it uses 4kB/sector. /sys/block/<disk>/queue/logical_block_size=512 /sys/block/<disk>/queue/physical_block_size=4096 The info should be available through IDENTIFY DEVICE (ATA) or READ CAPACITY 16 (SCSI) commands. -- Pasi _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
