[Bug 926160] Re: precise cloud-images significantly larger than oneiric

[Scott Moser]

** Description changed:

  See below for detail, but basically from oneiric released images to
  precise images, we've grown from root filesystem used of 762M to 973M.
  That is 27% size increase.
  
  This compares what I found on
     ubuntu-oneiric-11.10-<arch>-server-20120108
     ubuntu-precise-daily-<arch>-server-20120202
  
  The .img and .tar.gz files on cloud-images have grown also, but
  strangely it seems less.  comparing alpha-2 from precise to last release
  of oneiric (20120108) shows:
  
  -------------- | 11.10 | prec | %growth
  amd64 disk.img | 218M  | 228M |  4.8
  amd64 .tar.gz_ | 207M  | 217M |  4.6
+ amd64 file tot | 559M  | 575M |  2.9
  amd64 ebs df__ | 762M  | 883M | 15.8
  amd64 inst df_ | 655M  | 823M | 25.6
  i386_ disk.img | 198M  | 210M |  6.0
  i386_ .tar.gz_ | 188M  | 200M |  6.3
+ i386_ file tot | 484M  | 505M |  4.3
  i386_ ebs df__ | 689M  | 814M | 18.1
  i386_ inst df_ | 582M  | 753M | 29.3
  
- (Note, precise df numers are from daily build 20120108, 1 day after
- alpha2)
+ (Note, precise df numers are from daily build 20120108, 1 day after alpha2)
+ 'file tot' is result of 'du --total --one-file-system --apparent-size'.
  
  I suspect that part of the discrepancy between instance and ebs is
  somehow related to how we populate them.  In the build process, the
  instance store builds are done into a 1.4G filesystem, and then that is
  grown (resize2fs) to 10G before publishing to EC2.  The EBS population
  script downloads the 1.4GB filesystem image, creates a filesystem on a
  8G disk, then mounts it loopback and rsync's the data from the image to
  the new filesystem.  (Essentially, mkfs is done on a 1.4G filesystem,
  and one is done on a 8G filesystem).
  
  So i have the following separate issues raised from above:
   * why such a dramatic growth between 11.10 and 12.04 current
   * can we/should we get the EBS filesystem usage more in line with instance-store?
   * Why the change in increased usage of ebs for a given release-arch:
     oneiric-amd64: 16%
     oneiric-i386:  18%
     precise-amd64: 7.2%
     precise-i386: 8%

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Title:
  precise cloud-images significantly larger than oneiric

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