Re: Re: grub2-install: Couldn't find physical volume ‘(null)’.

[Sam Varshavchik]

Andrei Borzenkov writes:

> 11.04.2016 05:03, Sam Varshavchik пишет:
> > grub 2.02, Fedora x86-64.
> >
> > I have /dev/sda and /dev/sdb in a RAID-1 configuration. This is the
> > Linux kernel's md-raid driver.
> >
> > /dev/sda started failing SMART.
> >
> > I ran /sbin/grub2-install /dev/sdb. My recollection is that it ran
> > without any complaints.
> >
> > After that, I yanked out /dev/sda. I reattached /dev/sdb as /dev/sda,
> > and put in a new hard drive as the new /dev/sdb.
> >
> > I booted up, and kicked off a rebuild of my RAID-1 volumes, everything
> > is going well.
> >
> > Now, after all of that was done, I decided to install grub2 on the new
> > /dev/sdb:
> >
> > address@hidden ~]# /sbin/grub2-install /dev/sdb
> > Installing for i386-pc platform.
> > /sbin/grub2-install: warning: Couldn't find physical volume ‘(null)’.
> > Some modules may be missing from core image..
> > /sbin/grub2-install: warning: Couldn't find physical volume ‘(null)’.
> > Some modules may be missing from core image..
> > Installation finished. No error reported.
> >
> > Now, anyone have any idea what's up with these warnings?
> >
>
> Could you show output of "mdadm --detail" for your MD device?

Below.

Googling around finds some references of this warning coming out while the  
md-raid volumes are being synced. This warning still comes out after  
everything is fully synced up.

/dev/md0:
       Version : 1.0
 Creation Time : Sat Sep 18 18:15:10 2010
    Raid Level : raid1
    Array Size : 1048564 (1023.99 MiB 1073.73 MB)
 Used Dev Size : 1048564 (1023.99 MiB 1073.73 MB)
  Raid Devices : 2
 Total Devices : 2
   Persistence : Superblock is persistent

   Update Time : Mon Apr 11 06:53:19 2016
         State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0

          Name : monster:0
          UUID : 7ae940a5:bd5a0d0f:666adf78:e0c5b498
        Events : 1188

   Number   Major   Minor   RaidDevice State
      2       8       17        0      active sync   /dev/sdb1
      1       8        1        1      active sync   /dev/sda1

/dev/md1:
       Version : 1.1
 Creation Time : Sat Sep 18 18:15:10 2010
    Raid Level : raid1
    Array Size : 1048568 (1023.99 MiB 1073.73 MB)
 Used Dev Size : 1048568 (1023.99 MiB 1073.73 MB)
  Raid Devices : 2
 Total Devices : 2
   Persistence : Superblock is persistent

   Update Time : Sun Apr 10 20:50:41 2016
         State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0

          Name : monster:1
          UUID : 067004a2:11daf9c2:0cedca66:ac63c62d
        Events : 1127

   Number   Major   Minor   RaidDevice State
      2       8       18        0      active sync   /dev/sdb2
      1       8        2        1      active sync   /dev/sda2

/dev/md2:
       Version : 1.1
 Creation Time : Sat Sep 18 18:15:11 2010
    Raid Level : raid1
    Array Size : 104856576 (100.00 GiB 107.37 GB)
 Used Dev Size : 104856576 (100.00 GiB 107.37 GB)
  Raid Devices : 2
 Total Devices : 2
   Persistence : Superblock is persistent

 Intent Bitmap : Internal

   Update Time : Mon Apr 11 06:53:34 2016
         State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0

          Name : monster:2
          UUID : b0cb9b26:be362a98:012cdf18:19de5ac1
        Events : 59413

   Number   Major   Minor   RaidDevice State
      3       8       19        0      active sync   /dev/sdb3
      2       8        3        1      active sync   /dev/sda3

/dev/md3:
       Version : 1.1
 Creation Time : Sun Nov 13 14:47:12 2011
    Raid Level : raid1
    Array Size : 869803752 (829.51 GiB 890.68 GB)
 Used Dev Size : 869803752 (829.51 GiB 890.68 GB)
  Raid Devices : 2
 Total Devices : 2
   Persistence : Superblock is persistent

 Intent Bitmap : Internal

   Update Time : Mon Apr 11 06:54:45 2016
         State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0

          Name : monster:3
          UUID : ac2446aa:661a4977:0960a296:6d0b48c3
        Events : 165897

   Number   Major   Minor   RaidDevice State
      3       8       21        0      active sync   /dev/sdb5
      2       8        5        1      active sync   /dev/sda5

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