我刚刚将 lvm2 根文件系统从线性 lvm2(单个 HDD:sda)转换为 lvm2 raid1(使用lvconvert -m1 --type raid1 /dev/ubuntu/root /dev/sdb5
命令)。但转换后,我无法启动我的 ubuntu 12.10(内核 3.5.0-17-generic)。
Initramfs 说它在 /dev/mapper 中找不到根文件系统:
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
... (kernel messages)
Gave up waiting for root device. Common problems:
- Boot args (cat /proc/cmdline)
- Check rootdelay= (did the system wait long enough?)
- Check root= (did the system wait for the right device?)
- Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/mapper/ubuntu-root does not exist. Dropping to a shell!
这是我的模块和命令行列表:
(initramfs) cat /proc/modules
hid_generic
usbhid
hid
e1000
raid10
raid456
async_pq
async_xor
xor
async_memcpy
async_raid6_recov
raid6_pq
async_tx
raid1
raid0
multipath
linear
(initramfs) cat /proc/cmdline
BOOT_IMAGE=/vmlinux-3.5.0-17-generic root=/dev/mapper/ubuntu-root ro
(initramfs) ls /dev/mapper
control ubuntu-swap_1
实用程序的输出lvm
表明根 LV 处于非活动状态/不可用:
lvm> pvscan
PV /dev/sda5 VG ubuntu lvm2 [ 13.76 GiB / 408.00 MiB free]
PV /dev/sdb5 VG ubuntu lvm2 [ 13.76 GiB / 508.00 MiB free]
lvm> vgscan
Reading all physical volumes. This may take a while...
Found volume group "ubuntu" using metadata type lvm2
lvm> lvscan
inactive '/dev/ubuntu/root' [13.26 GiB] inherit
ACTIVE '/dev/ubuntu/swap_1' [100.00 MiB] inherit
lvm> lvdisplay ubuntu
--- Logical volume ---
LV Path /dev/ubuntu/root
LV Name root
VG Name ubuntu
LV UUID xxxxxxxxxxxxxxx
LV Write Access read/write
LV Creation host, time ubuntu, 2013-05-07
LV Status NOT available <<<<< !!!!
LV Size 13.26 GB
Current LE 3394
Mirrored volumes 2
Segments 1
Allocation inherit
Read ahead sectors auto
lvchange -ay ubuntu
在我的例子中,initrd 失败:
lvm> lvchange -ay ubuntu
/sbin/modprobe failed: 1
Can't process LV root: raid1 target support missing from kernel?
我的 initrd 中缺少哪个模块?现在我拥有此内核的完整模块集合,可以尝试任何模块。
答案1
你需要这个:
modprobe dm_raid
{pv,vg,lv}scan
查看磁盘并查看其中的 LV。但由于内核无法以配置的方式提供对它们的访问,因此无法访问它们。