kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance will be

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c0mputerking

Renowned Member
Oct 5, 2011
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Hello I successfully setup proxmox 2 rc1 on a new machine and I am getting this my log. I have read in forums elsewhere about this error and nobody seems to know for sure if it really effects performance. So I was hoping somebody here might know if there is a way to fix this or if it even needs fixing?kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance will be poor.This machine is a dell Poweredge r410 with 3 600G SAS 15K RPM drives. I have installed Debian Squeeze using the non-free netinstall disk as like to use linux software raid 5 with ext4 file system.here is an fdisk output please let me know if you need more infos about anything regarding this error

Code: 
 fdisk -l

Disk /dev/sda: 600.1 GB, 600127266816 bytes
255 heads, 63 sectors/track, 72961 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xda3f561c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1216     9764864   fd  Linux raid autodetect
/dev/sda2            1216       72962   576294912   fd  Linux raid autodetect

Disk /dev/sdb: 600.1 GB, 600127266816 bytes
255 heads, 63 sectors/track, 72961 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xda3f5612

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1        1216     9764864   fd  Linux raid autodetect
/dev/sdb2            1216       72962   576294912   fd  Linux raid autodetect

Disk /dev/sdc: 600.1 GB, 600127266816 bytes
255 heads, 63 sectors/track, 72961 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xda3f560b

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *           1        1216     9764864   fd  Linux raid autodetect
/dev/sdc2            1216       72962   576294912   fd  Linux raid autodetect

Disk /dev/md0: 9998 MB, 9998098432 bytes
2 heads, 4 sectors/track, 2440942 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

Disk /dev/md1: 1180.2 GB, 1180248834048 bytes
2 heads, 4 sectors/track, 288146688 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/dm-0: 998 MB, 998244352 bytes
255 heads, 63 sectors/track, 121 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 1996 MB, 1996488704 bytes
255 heads, 63 sectors/track, 242 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-1 doesn't contain a valid partition table

Disk /dev/dm-2: 9999 MB, 9999220736 bytes
255 heads, 63 sectors/track, 1215 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-2 doesn't contain a valid partition table

Disk /dev/dm-3: 10.4 GB, 10368319488 bytes
255 heads, 63 sectors/track, 1260 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-3 doesn't contain a valid partition table

Disk /dev/dm-4: 4999 MB, 4999610368 bytes
255 heads, 63 sectors/track, 607 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-4 doesn't contain a valid partition table

Disk /dev/dm-5: 200.0 GB, 199996997632 bytes
255 heads, 63 sectors/track, 24314 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-5 doesn't contain a valid partition table

Disk /dev/dm-6: 998 MB, 998244352 bytes
255 heads, 63 sectors/track, 121 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x00000000

Disk /dev/dm-6 doesn't contain a valid partition table
 
Last edited:
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

I really hate to bump this as my preformace seems ok, and i am not running a supported bare metal install of proxmox, and i do think proxmox only likes ext3 just curious i guess .....
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

Ok I have ext4 so what of the error?
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

No I did not install with your cd as I wanted software raid 5 check the post that has the exact error in it I'm on my phone right now
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

Have you found anything on this? I have the same errors in my log. I Installed with the CD but migrated to a Raid 1 setup with ext4 afterwards.
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

i have this in the log too and i don't know if it's an error or not.
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

Eh, sorry to retreive a old topic, but I have the same error :
Aug 20 15:42:12 proxmox-bureau kernel: EXT4-fs (dm-2): Unaligned AIO/DIO on inode 9568272 by kvm; performance will be poor.

I don't see that before, I don't know the VM which provide the problem. Is it an important message ? How can I debug this ?

Thanks !
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

Sorry to revive an old topic, but I'd like to a "me too".
EXT4-fs (md1): Unaligned AIO/DIO on inode 25690132 by kvm; performance will be poor.

I believe this is coming from a Win2k3 guest with IDE drivers. I plan to switch drives to VirtIO, but I don't expect that will affect alignment.

FWIW, here is the partition table of one of the disks. sda2 is a member of md1, which is a raid-1 array.
root@tacs-host:~# fdisk -l /dev/sda

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x39ed39ec

Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 194560 fd Linux raid autodetect
Partition 1 does not end on cylinder boundary.
/dev/sda2 25 60802 488189952 fd Linux raid autodetect

Or, as parted sees it:
Model: ATA MB0500EAMZD (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 1049kB 200MB 199MB primary boot, raid
2 200MB 500GB 500GB primary raid


Any guidance will be appreciated.
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

shubes said:
Sorry to revive an old topic, but I'd like to a "me too".
EXT4-fs (md1): Unaligned AIO/DIO on inode 25690132 by kvm; performance will be poor.

I believe this is coming from a Win2k3 guest with IDE drivers. I plan to switch drives to VirtIO, but I don't expect that will affect alignment.
Click to expand...

Hello shubes,

no, there is no context with any MS-Windows System...
look for examble https://access.redhat.com/site/solutions/62016
I get the same messages with proxmox 3.1-42 and a SME-Server VM (on a 3TB Western Digital HDD ext4 with LVM)

maxprox
 
Re: kernel: EXT4-fs (dm-3): Unaligned AIO/DIO on inode 130479 by kvm; performance wil

maxprox said:
Hello shubes,

no, there is no context with any MS-Windows System...
look for examble https://access.redhat.com/site/solutions/62016
I get the same messages with proxmox 3.1-42 and a SME-Server VM (on a 3TB Western Digital HDD ext4 with LVM)

maxprox
Click to expand...


I am too getting these messages in syslog.

I wonder how serous they are, and what do they mean?

Anybody got more info on those?

I am using Ext4 (for now).
 
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