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 
be rather surprised if Oracle sells 4KB sector disks for Solaris systems…
 -- richard


ZFS and performance consulting
LISA '11, Boston, MA, December 4-9 

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