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KVM host, add LV to guest
Moving /usr to its own filesystem/logical volumeWhat steps can I use to recover a RAID 1 array with LVM and EXT3 on it?Software RAID 10 + LVM on mixed drives, sector alignment?KVM linux guest, 2nd HDD, LVM partition or whole diskLVM: is this mirrored? is copy this slow?Ubuntu 14.04 software RAID with LVM install won't boot on bare metalWindows overrode a LVM pv metadataHow to add a btrfs raid 1 to an encrypted lvm2 volume group under Solus OS (Linux)?Resize2fs keeps asking me to run e2fsck -fExtending a multipath'd /dev/mapper device that isn't listed as an LVM anywhere
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I have a KVM host with a software RAID 10 array. The software RAID 10 array is a PV on the host and there's a single VG.
I have a couple of LVs used at the host level (a datastore for KVM guest .img files).
Normally when adding a new disk to a guest I create the LV on the host then add that to the guest's config. Then pvcreate directly on the block device (no partition), vgcreate, lvcreate and mkfs on the new block device within the guest.
I don't bother partitioning the block device before pvcreate because it's one less step to do when resizing the LV on the host. I realise the downside is in theory some systems might decide to automatically partition the unpartitioned block device because they don't recognise the LVM metadata, though I have never ever seen this happen in practice.
When resizing the LV on the host the free space in the PV is picked up and I have to vgextend, lvextend and resize2fs in the guest.
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
lvm kvm
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
add a comment |
I have a KVM host with a software RAID 10 array. The software RAID 10 array is a PV on the host and there's a single VG.
I have a couple of LVs used at the host level (a datastore for KVM guest .img files).
Normally when adding a new disk to a guest I create the LV on the host then add that to the guest's config. Then pvcreate directly on the block device (no partition), vgcreate, lvcreate and mkfs on the new block device within the guest.
I don't bother partitioning the block device before pvcreate because it's one less step to do when resizing the LV on the host. I realise the downside is in theory some systems might decide to automatically partition the unpartitioned block device because they don't recognise the LVM metadata, though I have never ever seen this happen in practice.
When resizing the LV on the host the free space in the PV is picked up and I have to vgextend, lvextend and resize2fs in the guest.
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
lvm kvm
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
add a comment |
I have a KVM host with a software RAID 10 array. The software RAID 10 array is a PV on the host and there's a single VG.
I have a couple of LVs used at the host level (a datastore for KVM guest .img files).
Normally when adding a new disk to a guest I create the LV on the host then add that to the guest's config. Then pvcreate directly on the block device (no partition), vgcreate, lvcreate and mkfs on the new block device within the guest.
I don't bother partitioning the block device before pvcreate because it's one less step to do when resizing the LV on the host. I realise the downside is in theory some systems might decide to automatically partition the unpartitioned block device because they don't recognise the LVM metadata, though I have never ever seen this happen in practice.
When resizing the LV on the host the free space in the PV is picked up and I have to vgextend, lvextend and resize2fs in the guest.
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
lvm kvm
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
I have a KVM host with a software RAID 10 array. The software RAID 10 array is a PV on the host and there's a single VG.
I have a couple of LVs used at the host level (a datastore for KVM guest .img files).
Normally when adding a new disk to a guest I create the LV on the host then add that to the guest's config. Then pvcreate directly on the block device (no partition), vgcreate, lvcreate and mkfs on the new block device within the guest.
I don't bother partitioning the block device before pvcreate because it's one less step to do when resizing the LV on the host. I realise the downside is in theory some systems might decide to automatically partition the unpartitioned block device because they don't recognise the LVM metadata, though I have never ever seen this happen in practice.
When resizing the LV on the host the free space in the PV is picked up and I have to vgextend, lvextend and resize2fs in the guest.
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
lvm kvm
lvm kvm
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
asked Aug 6 '15 at 15:34
batfastadbatfastad
7952 gold badges10 silver badges21 bronze badges
7952 gold badges10 silver badges21 bronze badges
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
There's absolutely no requirement to use LVM inside a guest. You can just use the block device directly. Using LVM inside the guest gets you almost nothing (since you're already using LVM on the host to manage your space).
If by "KVM" you mean "libvirt", you can do use the virsh blockresize command to get your guest to recognize the additional space once you've resized a block device. That is, if I have a guest with an attached LV:
</disk><disk type="block" device="disk">
<driver name="qemu" type="raw"/>
<source dev="/dev/tank/foobar"/>
<backingStore/>
<target dev="vdb" bus="virtio"/>
<alias name="virtio-disk1"/></disk>
Where:
# lvs
foobar tank -wi-ao---- 4.00g
I can add space to the LV on the host:
# lvresize -L +2G /dev/tank/foobar
Tell libvirt to update the size:
# virsh blockresize myguest /dev/tank/foobar --size 0
And then inside the guest, resize the filestem:
guest# resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/vdb to 1572864 (4k) blocks.
The filesystem on /dev/vdb is now 1572864 (4k) blocks long.
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
add a comment |
I've a similar issue. But I can not use blockresize because I'm using an old virsh version under RHEL 5 (I know I should upgrade but it has dependencies with application) I extended the LVM in the host but what should be the process to "notify" the guest the LVM has a new size?
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
votes
active
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votes
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oldest
votes
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
There's absolutely no requirement to use LVM inside a guest. You can just use the block device directly. Using LVM inside the guest gets you almost nothing (since you're already using LVM on the host to manage your space).
If by "KVM" you mean "libvirt", you can do use the virsh blockresize command to get your guest to recognize the additional space once you've resized a block device. That is, if I have a guest with an attached LV:
</disk><disk type="block" device="disk">
<driver name="qemu" type="raw"/>
<source dev="/dev/tank/foobar"/>
<backingStore/>
<target dev="vdb" bus="virtio"/>
<alias name="virtio-disk1"/></disk>
Where:
# lvs
foobar tank -wi-ao---- 4.00g
I can add space to the LV on the host:
# lvresize -L +2G /dev/tank/foobar
Tell libvirt to update the size:
# virsh blockresize myguest /dev/tank/foobar --size 0
And then inside the guest, resize the filestem:
guest# resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/vdb to 1572864 (4k) blocks.
The filesystem on /dev/vdb is now 1572864 (4k) blocks long.
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
add a comment |
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
There's absolutely no requirement to use LVM inside a guest. You can just use the block device directly. Using LVM inside the guest gets you almost nothing (since you're already using LVM on the host to manage your space).
If by "KVM" you mean "libvirt", you can do use the virsh blockresize command to get your guest to recognize the additional space once you've resized a block device. That is, if I have a guest with an attached LV:
</disk><disk type="block" device="disk">
<driver name="qemu" type="raw"/>
<source dev="/dev/tank/foobar"/>
<backingStore/>
<target dev="vdb" bus="virtio"/>
<alias name="virtio-disk1"/></disk>
Where:
# lvs
foobar tank -wi-ao---- 4.00g
I can add space to the LV on the host:
# lvresize -L +2G /dev/tank/foobar
Tell libvirt to update the size:
# virsh blockresize myguest /dev/tank/foobar --size 0
And then inside the guest, resize the filestem:
guest# resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/vdb to 1572864 (4k) blocks.
The filesystem on /dev/vdb is now 1572864 (4k) blocks long.
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
add a comment |
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
There's absolutely no requirement to use LVM inside a guest. You can just use the block device directly. Using LVM inside the guest gets you almost nothing (since you're already using LVM on the host to manage your space).
If by "KVM" you mean "libvirt", you can do use the virsh blockresize command to get your guest to recognize the additional space once you've resized a block device. That is, if I have a guest with an attached LV:
</disk><disk type="block" device="disk">
<driver name="qemu" type="raw"/>
<source dev="/dev/tank/foobar"/>
<backingStore/>
<target dev="vdb" bus="virtio"/>
<alias name="virtio-disk1"/></disk>
Where:
# lvs
foobar tank -wi-ao---- 4.00g
I can add space to the LV on the host:
# lvresize -L +2G /dev/tank/foobar
Tell libvirt to update the size:
# virsh blockresize myguest /dev/tank/foobar --size 0
And then inside the guest, resize the filestem:
guest# resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/vdb to 1572864 (4k) blocks.
The filesystem on /dev/vdb is now 1572864 (4k) blocks long.
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
I don't suppose there's a way I can skip having LVM running in the guest and just lvextend on the host then resize2fs in the guest?
There's absolutely no requirement to use LVM inside a guest. You can just use the block device directly. Using LVM inside the guest gets you almost nothing (since you're already using LVM on the host to manage your space).
If by "KVM" you mean "libvirt", you can do use the virsh blockresize command to get your guest to recognize the additional space once you've resized a block device. That is, if I have a guest with an attached LV:
</disk><disk type="block" device="disk">
<driver name="qemu" type="raw"/>
<source dev="/dev/tank/foobar"/>
<backingStore/>
<target dev="vdb" bus="virtio"/>
<alias name="virtio-disk1"/></disk>
Where:
# lvs
foobar tank -wi-ao---- 4.00g
I can add space to the LV on the host:
# lvresize -L +2G /dev/tank/foobar
Tell libvirt to update the size:
# virsh blockresize myguest /dev/tank/foobar --size 0
And then inside the guest, resize the filestem:
guest# resize2fs 1.42.12 (29-Aug-2014)
Resizing the filesystem on /dev/vdb to 1572864 (4k) blocks.
The filesystem on /dev/vdb is now 1572864 (4k) blocks long.
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
answered Aug 6 '15 at 20:49
larskslarsks
12.2k3 gold badges30 silver badges42 bronze badges
12.2k3 gold badges30 silver badges42 bronze badges
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
add a comment |
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
That's ideal. I thought it was totally pointless having LVM in the guest but wasn't sure if I could write an FS directly to the block device within the guest. Thanks!
– batfastad
Aug 7 '15 at 23:30
add a comment |
I've a similar issue. But I can not use blockresize because I'm using an old virsh version under RHEL 5 (I know I should upgrade but it has dependencies with application) I extended the LVM in the host but what should be the process to "notify" the guest the LVM has a new size?
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I've a similar issue. But I can not use blockresize because I'm using an old virsh version under RHEL 5 (I know I should upgrade but it has dependencies with application) I extended the LVM in the host but what should be the process to "notify" the guest the LVM has a new size?
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I've a similar issue. But I can not use blockresize because I'm using an old virsh version under RHEL 5 (I know I should upgrade but it has dependencies with application) I extended the LVM in the host but what should be the process to "notify" the guest the LVM has a new size?
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I've a similar issue. But I can not use blockresize because I'm using an old virsh version under RHEL 5 (I know I should upgrade but it has dependencies with application) I extended the LVM in the host but what should be the process to "notify" the guest the LVM has a new size?
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
PedroPedro
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
PedroPedro
1
answered 1 hour ago
PedroPedro
1
1
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Pedro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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