Dotaz: Přidání disku do virt. hosta KVM bez rebootu

[Mirek]

Jak v prostředí KVM virtualizace za běhu vitrualniho hosta ( Linux ) přidat disk bez rebootu.

Řešení typu

host# qemu-img create -f qcow2 new-home.img 10G
host# virsh
virsh # attach-disk domain /path/to/disk_image/new-home.img vdb
Disk attached successfully

Reboot the guest, and run fdisk -l as root.

Mne neuspokojuje. Díky

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Odpovědi

[linuxik]

Vytvoreni noveho disku a pripojeni do KVM se da naklikat ve virt-manageru a misto restartu guesta muzes zkusit 'echo "- - -" > /sys/class/scsi_host/hostX/scan' nebo 'partprobe'.

ps. Staci to k tvemu uspokojeni?

[Mirek]

1. ano virt-manager znam 2. partprobe zabralo pri odebrani disku, pri pridani nikoliv sushana:/sys/class # partprobe Warning: Error fsyncing/closing /dev/vdc: Input/output error

3. echo "- - -" > /sys/class/scsi_host/host0/scan i echo "- - -" > /sys/class/scsi_host/host1/scan bez efektu

[alkoholik]

Viz manual:
Hot-adding a disk means hot-adding a PCI device, so you need PCI hotplug support in the guest for this to work.
Takze:
virsh
connect qemu:///system
qemu-monitor-command --hmp VIRT_NAME 'pci_add auto storage file=FILE_IMG,if=virtio'
pripadne
qemu-monitor-command --hmp VIRT_NAME 'pci_add auto storage file=FILE_IMG,if=scsi'
a v guestu:
echo 1 > /sys/bus/pci/rescan

[Mirek]

Diky

presne to jsem potreboval. Pomohlo toto echo 1 > /sys/bus/pci/rescan

Mirek

[linuxik]

Tak to je divne s VirtIO emulaci mi to na Centos6 funguje uplne automaticky. Pridam disk a hned ho vidim v systemu.

pci 0000:00:07.0: reg 10 io port: [0x00-0x3f]
pci 0000:00:07.0: reg 14 32bit mmio: [0x000000-0x000fff]
pci 0000:00:00.0: no hotplug settings from platform
pci 0000:00:00.0: using default PCI settings
pci 0000:00:01.0: no hotplug settings from platform
pci 0000:00:01.0: using default PCI settings
ata_piix 0000:00:01.1: no hotplug settings from platform
ata_piix 0000:00:01.1: using default PCI settings
uhci_hcd 0000:00:01.2: no hotplug settings from platform
uhci_hcd 0000:00:01.2: using default PCI settings
piix4_smbus 0000:00:01.3: no hotplug settings from platform
piix4_smbus 0000:00:01.3: using default PCI settings
pci 0000:00:02.0: no hotplug settings from platform
pci 0000:00:02.0: using default PCI settings
virtio-pci 0000:00:03.0: no hotplug settings from platform
virtio-pci 0000:00:03.0: using default PCI settings
HDA Intel 0000:00:04.0: no hotplug settings from platform
HDA Intel 0000:00:04.0: using default PCI settings
virtio-pci 0000:00:05.0: no hotplug settings from platform
virtio-pci 0000:00:05.0: using default PCI settings
virtio-pci 0000:00:06.0: no hotplug settings from platform
virtio-pci 0000:00:06.0: using default PCI settings
pci 0000:00:07.0: no hotplug settings from platform
pci 0000:00:07.0: using default PCI settings
virtio-pci 0000:00:07.0: enabling device (0000 -> 0003)
virtio-pci 0000:00:07.0: PCI INT A -> Link[LNKC] -> GSI 10 (level, high) -> IRQ 10
  alloc irq_desc for 30 on node -1
  alloc kstat_irqs on node -1
virtio-pci 0000:00:07.0: irq 30 for MSI/MSI-X
  alloc irq_desc for 31 on node -1
  alloc kstat_irqs on node -1
virtio-pci 0000:00:07.0: irq 31 for MSI/MSI-X
 vdb: unknown partition table

[alkoholik]

Vam to funguje automaticky, protoze mate v guestu nahrany modul acpiphp.

[xkucf03]

Upravil jsem formátování dotazu (přidal <pre/> pro lepší čitelnost)