From 7ba6381f381a0aeb09529b9f6fc6289b84f11f47 Mon Sep 17 00:00:00 2001
From: Michael Marineau <michael.marineau@coreos.com>
Date: Mon, 3 Nov 2014 13:19:58 -0800
Subject: [PATCH] disk_layout: align partitions and disk sizes to 2MB

The VHD format actually uses 2MB blocks internally so the 1MB alignment
used in e77e4e54 wasn't sufficent to prevent other tools from further
adjusting the image size to align it. Additionally a 1MB alignment may
be triggering a bug in OpenStack or XenServer disk resizing that renders
that partial block at the end of the old image size unmapped/unavailabe.
---
 build_library/disk_layout.json | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/build_library/disk_layout.json b/build_library/disk_layout.json
index ec59424785..6071867f37 100644
--- a/build_library/disk_layout.json
+++ b/build_library/disk_layout.json
@@ -1,9 +1,9 @@
 {
   "_comment": "See http://www.chromium.org/chromium-os/building-chromium-os/disk-layout-format",
   "metadata":{
-    "_comment": "Partitions are aligned to 1MB (2048 blocks), disks sizes should align to *both* 1MB and a CHS cylender boundry for the common 16H 63S geometry (16*63 = 1008 blocks). The least common multiple of 2048 and 1008 is 129024 blocks.",
-    "part_alignment": 2048,
-    "disk_alignment": 129024,
+    "_comment": "Partitions are aligned to 2MB (4096 blocks). For the sake of VHD disks sizes should align to *both* 2MB and a CHS cylender boundry for the common 16H 63S geometry (16*63 = 1008 blocks). The least common multiple of 4096 and 1008 is 258048 blocks.",
+    "part_alignment": 4096,
+    "disk_alignment": 258048,
     "block_size": 512,
     "fs_block_size": 4096
   },
@@ -64,7 +64,7 @@
       "9":{
         "label":"ROOT",
         "type":"coreos-resize",
-        "blocks":"4302848",
+        "blocks":"4427776",
         "fs_type":"btrfs",
         "fs_subvolume":"root",
         "mount":"/"
@@ -73,19 +73,19 @@
     "vm":{
       "9":{
         "label":"ROOT",
-        "blocks":"12689408"
+        "blocks":"12943360"
       }
     },
     "azure":{
       "9":{
         "label":"ROOT",
-        "blocks":"58752990"
+        "blocks":"58875904"
       }
     },
     "vagrant":{
       "9":{
         "label":"ROOT",
-        "blocks":"33591296"
+        "blocks":"33845248"
       }
     },
     "onmetal":{