Setting up bootblock on RAID 0 SVM Post: 302445795

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Operating Systems Solaris Setting up bootblock on RAID 0 SVM Post 302445795 by hergp on Tuesday 17th of August 2010 01:29:36 AM

08-17-2010

Registered User

Keepcase,

in a raid 1 (no matter how many disks you have in it), every subdisk (diskslice) is identical to the others and to the raidset itself. Therefore every subdisk in a raid 1 has the full information of the filesystem built on top of the raidset. As long as you do not update the filesystem (mount it read/write), you can use a subdisk instead of the raidset without messing things up.

What happens when the system boots (from a ufs root filesystem) is this:
The OBP reads the bootblock from one of the disks (the details are configured in the OBP), then the bootblock loads a secondary bootloader called ufsboot, which loads the kernel and essential drivers. Later, when the kernel has enough information to understand mirrored disks, it switches from using the subdisk to the mirrored logical volume for the root filesystem.

When the root filesystem is scattered over more than one disk, all this is not possible (at least as long as OBP has no builtin means to understand logical volumes).

I hope, this helps to shed some light on the boot process with logical volumes.

hergp

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LEARN ABOUT MOJAVE

vgreduce

VGREDUCE(8)                                                   System Manager's Manual                                                  VGREDUCE(8)

NAME

       vgreduce - reduce a volume group

SYNOPSIS

       vgreduce  [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
       calVolumePath...]

DESCRIPTION

       vgreduce allows you to remove one or more unused physical volumes from a volume group.

OPTIONS

       See lvm for common options.

       -a, --all
              Removes all empty physical volumes if none are given on command line.

       --removemissing
              Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes  normal
              operation of the volume group (new logical volumes may again be created, changed and so on).

              If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
              them manually, you can run this option with --force to have vgreduce remove any partial LVs.

              Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those  parts
              that lie on disks that are still present.

              If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
              vating your logical volumes with --partial as described in lvm (8).

SEE ALSO

       lvm(8), vgextend(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                             VGREDUCE(8)