[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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