X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=align%2Fvirt-alignment-scan.pod;h=601c5e84b8f04db6176f2a2c68363162b5a8bf2d;hb=6011b1f803ba7308c6a94b9bf6b7212cfccb9f42;hp=3b6828b7fdcd3cd01f4aac15f90e679c701591e0;hpb=2910413850c7d9e8df753afad179e415f0638d6d;p=libguestfs.git

diff --git a/align/virt-alignment-scan.pod b/align/virt-alignment-scan.pod
index 3b6828b..601c5e8 100755
--- a/align/virt-alignment-scan.pod
+++ b/align/virt-alignment-scan.pod
@@ -229,8 +229,10 @@ data combined, and the two blocks written back (4x I/O).
 New versions of the Linux kernel expose the physical and logical block
 size, and minimum and recommended I/O size.
 
-For a typical hard drive with 512 byte sectors:
+For a typical consumer hard drive with 512 byte sectors:
 
+ $ cat /sys/block/sda/queue/hw_sector_size
+ 512
  $ cat /sys/block/sda/queue/physical_block_size
  512
  $ cat /sys/block/sda/queue/logical_block_size
@@ -240,6 +242,19 @@ For a typical hard drive with 512 byte sectors:
  $ cat /sys/block/sda/queue/optimal_io_size
  0
 
+For a new consumer hard drive with 4Kbyte sectors:
+
+ $ cat /sys/block/sda/queue/hw_sector_size
+ 4096
+ $ cat /sys/block/sda/queue/physical_block_size
+ 4096
+ $ cat /sys/block/sda/queue/logical_block_size
+ 4096
+ $ cat /sys/block/sda/queue/minimum_io_size
+ 4096
+ $ cat /sys/block/sda/queue/optimal_io_size
+ 0
+
 For a NetApp LUN:
 
  $ cat /sys/block/sdc/queue/logical_block_size
@@ -258,8 +273,8 @@ is 64K.
 For detailed information about what these numbers mean, see
 L<http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/newstorage-iolimits.html>
 
-[Thanks to Mike Snitzer for providing NetApp data and additional
-information.]
+[Thanks to Matt Booth for providing 4K drive data.  Thanks to Mike
+Snitzer for providing NetApp data and additional information.]
 
 =head2 1 MB PARTITION ALIGNMENT