From: Richard W.M. Jones <rjones@redhat.com>
Date: Thu, 27 Oct 2011 12:30:22 +0000 (+0100)
Subject: virt-alignment-scan: Add additional data for 4K sector drives
X-Git-Tag: 1.14.0~5
X-Git-Url: http://git.annexia.org/?a=commitdiff_plain;h=46e08a159a86d993a44830d70da442cd073859c2;p=libguestfs.git

virt-alignment-scan: Add additional data for 4K sector drives
(thanks Matt Booth).
---

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