[linux-lvm] pvcreate and partition alignment

Bryn M. Reeves bmr at redhat.com
Thu Mar 12 15:00:13 UTC 2009

On Thu, 2009-03-12 at 09:52 -0500, Eugene Vilensky wrote:
> Greetings,
> NetApp requires for best performance that all partitions be aligned to
> 4k boundaries to prevent "partial writes" and lost IOPS.  We are using
> LVM on un-partitioned devices.  The only response I can get out of
> NetApp is that, by not having a partition, the partition itself is not
> mis-aligned.  

You need to make sure that the extents on the PV have the correct

> We are using a blocksize of 4096b for ext3.  
> Is there another "allocation" setting that we need to select for LVM
> specifically, to ensure alignment to this 4k NetApp boundary?

See this thread on lvm-devel last month:



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