Não é possível tornar o Cache LVM persistente após a reinicialização do sistema

Question

Eu tenho o volume lógico do LVM na configuração do MDADM RAID1. Estou tentando adicionar o dispositivo SSD como cache a esse volume lógico por meio de:

vgextend dataVG /dev/sdd
lvcreate --type cache --cachemode writethrough -L 120G -n dataLV_cachepool dataVG/dataLV /dev/sdd

Tudo parece estar bem até que eu reinicie o meu sistema. Após a reinicialização ele falha ao iniciar e eu recebo o modo de recuperação (Ubuntu).

Eu vejo os seguintes erros durante o processo de inicialização:

lvm[740]:   dataVG: autoactivation failed.
systemd[1]: lvm2-pvscan@9:2.service: Main process exited, code=exited, status=5/NOTINSTALLED
systemd[1]: lvm2-pvscan@9:2.service: Failed with result 'exit-code'.
systemd[1]: Failed to start LVM2 PV scan on device 9:2.
lvm[774]:   /usr/sbin/cache_check: execvp failed: No such file or directory
lvm[774]:   Check of pool dataVG/dataLV_cachepool failed (status:2). Manual repair required!
lvm[774]:   0 logical volume(s) in volume group "dataVG" now active
lvm[774]:   dataVG: autoactivation failed.
systemd[1]: Started File System Check on /dev/mapper/BACKUPVG-mainbackup.
systemd[1]: lvm2-pvscan@8:16.service: Main process exited, code=exited, status=5/NOTINSTALLED
systemd[1]: lvm2-pvscan@8:16.service: Failed with result 'exit-code'.
systemd[1]: Failed to start LVM2 PV scan on device 8:16.
systemd[1]: Mounting /mnt/mainbackup...
systemd[1]: Mounted /mnt/mainbackup.
kernel: EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null)
systemd[1]: dev-mapper-dataVG\x2dataLV.device: Job dev-mapper-dataVG\x2dataLV.device/start timed out.
systemd[1]: Timed out waiting for device dev-mapper-dataVG\x2dataLV.device.
systemd[1]: Dependency failed for /mnt/dataLV.
systemd[1]: Dependency failed for Local File Systems.
systemd[1]: local-fs.target: Job local-fs.target/start failed with result 'dependency'.
systemd[1]: local-fs.target: Triggering OnFailure= dependencies.
systemd[1]: mnt-dataLV.mount: Job mnt-dataLV.mount/start failed with result 'dependency'.
systemd[1]: Dependency failed for File System Check on /dev/mapper/dataVG-dataLV.
systemd[1]: systemd-fsck@dev-mapper-dataVG\x2dataLV.service: Job systemd-fsck@dev-mapper-dataVG\x2dataLV.service/start failed with resu
systemd[1]: dev-mapper-dataVG\x2dataLV.device: Job dev-mapper-dataVG\x2dataLV.device/start failed with result 'timeout'.

Funciona apenas quando eu removo o drive em cache do VG:

lvconvert --uncache dataVG/dataLV

Não sabe como abordar esse problema ...

versão do LVM :

LVM version:     2.02.176(2) (2017-11-03)
Library version: 1.02.145 (2017-11-03)

    

Answer 1

Eu acho que você precisa do cache do módulo do kernel (dm-cache) e das ferramentas / usr / sbin / cache_ * no seu disco de inicialização. No fedora, ele é tratado pelo dracut, no pacote debian (e ubuntu) initramfs-tools.