RE: Running fsck on root file system




-----Original Message-----
From: Kenneth Holter [mailto:kenneho.ndu@xxxxxxxxx]
Sent: Wednesday, May 13, 2009 3:15 AM
To: redhat-list@xxxxxxxxxx
Subject: Running fsck on root file system

Hi all.


I need to run fsck.ext3 on a root partition that live in a logical
volume (lvm).

I know how to boot the installation CD into rescue mode, and run for
example
"fsck.ext3 /dev/sda2" to check a partition. But when /dev/sda2 is a
logical volume I guess I first need to activate the volume before I can
check it for errors. Does anyone have a link to a walkthrough on how to
do this?

Regards,
Kenneth Holter
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This should work for you:


# lvm pvscan (!!RHEL 4 or later rescue disk req'd)
# lvm vgscan
# lvm vgs
# lvm vgchange -a y VolGroup00
# lvm vgdisplay -v VolGroup00 | more
# fsck /dev/VolGroup00/LogvolX

Can't find a good superblock backup? To display:

# mke2fs -n /dev/VolGroup00/LogVolX

Other thoughts:

1. Clean bit could be set - to force an fsck:
# fsck -f /dev/vgname/lvolname
# sync; sync (to clear buffers) then run again.
# fsck

2. in emergency mode, root will mount read-only, to make
read/write:
# mount /dev/hdaX -o rw,remount /



Good Luck!

Mark Walters

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