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1

Let's say my host disk is using EXT4, I place an image-file for my virtual machine in either QCOW2 or RAW format which again is formatted with EXT4 inside.
Wouldn't journal data be written twice? First in the guest drive and then on the host?
Can I safely disable journal in one of them?
Or should I use a combination of two different filesystems on host and guest (if both are Linux).
If guest is Windows using NTFS, which also seem to be a journal-like filesystem, could I safely disable journal on host EXT4 FS?

Maybe yet another reason to assign block-device to your VM e.g LVM as you only have one filesystem.

I do have UPS on my servers but I'm still not sure if I should disable journal completely.

kvm ext4 qemu qcow2

share|improve this question

edited Apr 16 at 18:43

MrCalvin

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses /dev/sda5 as it's storage device, and I'm running virtio for the device type.
  
  – Charles Green
  Apr 15 at 17:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, that's basically that same as a LVM Logical volume
  
  – MrCalvin
  Apr 16 at 18:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Really close - but no image file, and bypasses the Ubuntu file system
  
  – Charles Green
  Apr 16 at 18:48
  

  
  
  
  

add a comment
 | 

1

Let's say my host disk is using EXT4, I place an image-file for my virtual machine in either QCOW2 or RAW format which again is formatted with EXT4 inside.
Wouldn't journal data be written twice? First in the guest drive and then on the host?
Can I safely disable journal in one of them?
Or should I use a combination of two different filesystems on host and guest (if both are Linux).
If guest is Windows using NTFS, which also seem to be a journal-like filesystem, could I safely disable journal on host EXT4 FS?

Maybe yet another reason to assign block-device to your VM e.g LVM as you only have one filesystem.

I do have UPS on my servers but I'm still not sure if I should disable journal completely.

kvm ext4 qemu qcow2

share|improve this question

edited Apr 16 at 18:43

MrCalvin

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses /dev/sda5 as it's storage device, and I'm running virtio for the device type.
  
  – Charles Green
  Apr 15 at 17:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, that's basically that same as a LVM Logical volume
  
  – MrCalvin
  Apr 16 at 18:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Really close - but no image file, and bypasses the Ubuntu file system
  
  – Charles Green
  Apr 16 at 18:48
  

  
  
  
  

add a comment
 | 

Let's say my host disk is using EXT4, I place an image-file for my virtual machine in either QCOW2 or RAW format which again is formatted with EXT4 inside.
Wouldn't journal data be written twice? First in the guest drive and then on the host?
Can I safely disable journal in one of them?
Or should I use a combination of two different filesystems on host and guest (if both are Linux).
If guest is Windows using NTFS, which also seem to be a journal-like filesystem, could I safely disable journal on host EXT4 FS?

Maybe yet another reason to assign block-device to your VM e.g LVM as you only have one filesystem.

I do have UPS on my servers but I'm still not sure if I should disable journal completely.

kvm ext4 qemu qcow2

share|improve this question

edited Apr 16 at 18:43

MrCalvin

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

share|improve this question

edited Apr 16 at 18:43

MrCalvin

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

share|improve this question

edited Apr 16 at 18:43

MrCalvin

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges

asked Apr 15 at 17:26

MrCalvinMrCalvin

13588 bronze badges