Changes between Version 6 and Version 7 of disk_alignment

Timestamp:

Apr 14, 2015, 11:44:06 PM (10 years ago)

Author:

Daniel Kahn Gillmor

Comment:

--

disk_alignment

@@ -20 +20 @@
  * RAID: `mdadm --examine $COMPONENTDEVICE | grep Version` 
   * if the version is 1.1 or 1.2, then look at the data offset: `mdadm --examine $COMPONENTDEVICE | grep 'Data Offset:` 
- * dm_crypt/LUKS: `cryptsetup luksDump $BASEDEVICE | grep '^Payload offset:'`
+ * dm_crypt/LUKS: `cryptsetup luksDump $BASEDEVICE | grep '^Payload offset:'` (this reports [http://sources.debian.net/src/cryptsetup/2:1.6.6-5/lib/libcryptsetup.h/?hl=981#L973 in sectors apparently], which means that we want to make sure it's a multiple of 8192 as well.
  * LVM
-  * Physical volumes: (look at "1st PE"): `pvs --units s -o +pe_start`
-  * Volume groups: (look at "Ext"): `vgs --units s -o +vg_extent_size`
+  * Physical volumes: (look at "1st PE"): `pvs --units s -o +pe_start`  (this should be a multiple of 8192S)
+  * Volume groups: (look at "Ext"): `vgs --units s -o +vg_extent_size` (this should be a multiple of 8192S as well)
 
 See also [source:puppet/modules/mayfirst/files/misc-utils/mf-check-block-alignment mf-check-block-alignment]