QEMU: qcow2 and RAM…which filesystem combi (avoid writing journal twice)?
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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
asked 10 hours ago
MrCalvinMrCalvin
1062
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
asked 10 hours ago
MrCalvinMrCalvin
1062
I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses/dev/sda5as it's storage device, and I'm running virtio for the device type.
– Charles Green
9 hours ago
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
asked 10 hours ago
MrCalvinMrCalvin
1062
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
kvm ext4 qemu qcow2
asked 10 hours ago
MrCalvinMrCalvin
1062
asked 10 hours ago
MrCalvinMrCalvin
1062
edited 9 hours ago
MrCalvin
asked 10 hours ago
MrCalvinMrCalvin
1062
asked 10 hours ago
MrCalvinMrCalvin
1062
asked 10 hours ago
MrCalvinMrCalvin
1062
1062
I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses/dev/sda5as it's storage device, and I'm running virtio for the device type.
– Charles Green
9 hours ago
add a comment |
I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses/dev/sda5as it's storage device, and I'm running virtio for the device type.
– Charles Green
9 hours ago
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
9 hours ago
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
9 hours ago
add a comment |
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I'll toss another option at you - you can devote a partition to your guest OS entirely. My Win10 guest uses
/dev/sda5as it's storage device, and I'm running virtio for the device type.– Charles Green
9 hours ago