[Bug 879387] Re: Partitions misaligned on advanced format drive WD20EARX

Danny Howard dannyman at toldme.com
Mon Mar 12 03:02:32 UTC 2012


10.04.4 LTS:

Formatting sdc3 (WDC WD20EARX-00P) to a full-disk ext4 partition via
gparted:

mkfs.ext4 -j -O extent -L '' /dev/sdc1

dev/sdc1 alignment is offset by 512 bytes.
This may result in very poor performance, (re)-partitioning suggested.
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=1 blocks, Stripe width=0 blocks
122101760 inodes, 488378000 blocks
24418900 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
14905 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
  4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
  102400000, 214990848

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

Oookay, soo ... it is not obvious to me how to fix this.  I'll try
resizing the partition with the first 1M empty, as suggested in that IBM
article.  I trying unselecting alignment to sector but I got errors all
over the place.

** Attachment added: "GParted reports misalignment."
   https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/879387/+attachment/2854193/+files/gparted_details.htm

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https://bugs.launchpad.net/bugs/879387

Title:
  Partitions misaligned on advanced format drive WD20EARX

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  After installing Ubuntu Oneiric 11.10 using manual partitioning on a
  2TB Western Digital WD20EARX with "advanced format" (4k sectors?) Disk
  Utility says all partitions are misaligned. Parted tells the same
  story (below). I'd expect the partitioner to align partitions.

  $ sudo parted -l
  Model: ATA WDC WD20EARX-00P (scsi)
  Disk /dev/sda: 2000GB
  Sector size (logical/physical): 512B/4096B
  Partition Table: gpt

  Number  Start   End     Size    File system     Name  Flags
   1      17.4kB  25.0GB  25.0GB  ext4
   2      25.0GB  125GB   100GB
   3      125GB   150GB   25.0GB  linux-swap(v1)
   4      150GB   2000GB  1850GB  ext4

  $ sudo parted /dev/sda align-check opt 1
  1 not aligned
  $ sudo parted /dev/sda align-check min 1
  1 not aligned

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Fri Oct 21 14:39:37 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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