Ubuntu
mdadm package

Realigning Ubuntu RAID - partition misaligned by 3072 bytes

Asked by Jack Webster

I've run into this issue with the "Advanced Format" drives - and it is dramatically affecting the speed of the array.

All resolutions I found seemed to deal with RAID arrays if Ubuntu was a part of the array - my layout is Ubuntu on a non-RAID drive, with a separate array for important data.

Is there a way for me to resolve this while keeping the data in tact? If not, how do I reformat the permissions to ensure this does not reoccur?

Thankyou very much!

Here's my RAID array (created with palimpsest): http://i.stack.imgur.com/CZ1Tv.png

Here's one of the 3x drives - all have the same error : http://i.stack.imgur.com/4tsnD.png

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Jack Webster (jack-webster) said : 		#1

Here's some extra detail if required:

toor@WEBSTERFS1:~$ sudo fdisk -l; mount; echo; lsb_release -a; uname -a

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ca654

   Device Boot Start End Blocks Id System
/dev/sda1 * 2048 480012287 240005120 83 Linux
/dev/sda2 480014334 488396799 4191233 5 Extended
/dev/sda5 480014336 488396799 4191232 82 Linux swap / Solaris

WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdd: 3000.6 GB, 3000592982016 bytes
255 heads, 63 sectors/track, 364801 cylinders, total 5860533168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot Start End Blocks Id System
/dev/sdd1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on a physical sector boundary.

WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdc: 3000.6 GB, 3000592982016 bytes
255 heads, 63 sectors/track, 364801 cylinders, total 5860533168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot Start End Blocks Id System
/dev/sdc1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on a physical sector boundary.

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdb: 3000.6 GB, 3000592982016 bytes
255 heads, 63 sectors/track, 364801 cylinders, total 5860533168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot Start End Blocks Id System
/dev/sdb1 1 4294967295 2147483647+ ee GPT
Partition 1 does not start on a physical sector boundary.

Disk /dev/md127: 6000.9 GB, 6000916561920 bytes
2 heads, 4 sectors/track, 1465067520 cylinders, total 11720540160 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Alignment offset: 3072 bytes
Disk identifier: 0x00000000

Disk /dev/md127 doesn't contain a valid partition table
Note: sector size is 4096 (not 512)

Disk /dev/sde: 4000.8 GB, 4000787025920 bytes
255 heads, 63 sectors/track, 60800 cylinders, total 976754645 sectors
Units = sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xe07ac620

   Device Boot Start End Blocks Id System
/dev/sde1 2048 976752639 3907002368 7 HPFS/NTFS/exFAT

Disk /dev/mapper/cryptswap1: 4291 MB, 4291821568 bytes
255 heads, 63 sectors/track, 521 cylinders, total 8382464 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd47d21d7

Disk /dev/mapper/cryptswap1 doesn't contain a valid partition table
/dev/sda1 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/md127 on /media/WEBSTERSTORE1 type ext4 (rw,nosuid,nodev,uhelper=udisks)
/dev/sde1 on /media/seagate1 type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096)
/home/toor/.Private on /home/toor type ecryptfs (ecryptfs_check_dev_ruid,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_unlink_sigs,ecryptfs_sig=5442e7ab4a298fb8,ecryptfs_fnek_sig=9e2f998a9951a0d4)
gvfs-fuse-daemon on /home/toor/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=toor)

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.4 LTS
Release: 12.04
Codename: precise
Linux WEBSTERFS1 3.8.0-35-generic #50~precise1-Ubuntu SMP Wed Dec 4 17:25:51 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#2

http://superuser.com/questions/179198/misaligned-raid-partition-in-ubuntu-10-04
http://ubuntuforums.org/showthread.php?t=1635018
http://petermoulding.com/the_partition_is_misaligned_by_48128_bytes_-_warning_from_linux_raid

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