Re: CentOS 7: restore fails

On 26/12/2016 1:47 πμ, Bruno Cornec wrote:

> ...
> In your case grub doesn't install correctly.
> ...
> grub2-install: error: cannot find a GRUB drive for /dev/vda1.  Check your device.map.
>
> THat's probably the issue here. Could you give us your /boot/grub2/device.map file please ?
> ...

Thanks Bruno,

Here it is:

    # this device map was generated by anaconda
    (hd0)      /dev/vda
    (hd1)      /dev/vda

Interestingly, I found that all my CentOS 7 VMs have the same 
/boot/grub2/device.map, which seemingly refers to two HDs, although the 
VM in fact includes only one (virtual) HD:

    [root@dns2 dns4]# parted -l
    Model: Linux device-mapper (linear) (dm)
    Disk /dev/mapper/centos-swap: 2147MB
    Sector size (logical/physical): 512B/512B
    Partition Table: loop
    Disk Flags:

    Number  Start  End     Size    File system     Flags
      1      0.00B  2147MB  2147MB  linux-swap(v1)

    Model: Linux device-mapper (linear) (dm)
    Disk /dev/mapper/centos-root: 18.8GB
    Sector size (logical/physical): 512B/512B
    Partition Table: loop
    Disk Flags:

    Number  Start  End     Size    File system  Flags
      1      0.00B  18.8GB  18.8GB  xfs

    Model: Virtio Block Device (virtblk)
    Disk /dev/vda: 21.5GB
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos
    Disk Flags:

    Number  Start   End     Size    Type     File system  Flags
      1      1049kB  525MB   524MB   primary  xfs          boot
      2      525MB   21.5GB  20.9GB  primary               lvm

This is NOT the case with my CentOS 5 and CentOS 6 VMs, which all have a 
"correct" device map, with a single (hda0) entry.

Is the above behavior expected? If not, what should be the expected way 
of operation and how do we fix things up?

Many Thanks!
Nick


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