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Re: [linux-lvm] restoring filesystem state using snapshot


i was having some problems installing lvm.

1. when i try to change the partition type using fdisk, i get a msg sayin
"No partition created yet!"

i have a 3gb hdd, with 3 partitions
hdb1  --- ext2
hdb5 --- swap
hdb6 --- ext2 ( abt 800mb)

2. so, then i did vgscan, followed by pvcreate on hdb6 without changing the partition type.
After this i got a file system error, and linux crashed.

Then i created a new partition for lvm
1. i added this partion by using 'n' command of fdisk.
2. then set the type of this partition to 8E.

A partition hdb3 of linux lvm type was created (along with hdb1,hdb5,hdb6).

3. i ran a vgscan,
4. then did pvcreate as follows
$pvcreate /dev/hdb3

It gave me a msg saying "Cannot read partition to to find PhysicalVolumeSize"

I have read all the How-tos i cud,but still not helpful.
Pls tell me what shud i do.

i will try rsync....once i install lvm.


From: Cameron Hutchison <camh xdna net>
Reply-To: linux-lvm sistina com
To: linux-lvm sistina com
Subject: Re: [linux-lvm] restoring filesystem state using snapshot
Date: Fri, 9 Jan 2004 10:31:18 +1100

Once upon a time Ken Fuchs said...
> >i want to restore the filesystem state using only the snapshot taken by LVM
> >ie without taking a full backup.
> Will copying the contents of the snapshot over the original logical
> volume do what you want? If so, this can be done as follows:
> # mount /dev/vg/snapshot /snap
> # mount /dev/vg/original /orig
> # (cd /snap; tar cf - .) | (cd /orig; tar xvf -)

rsync would probably be a better option - it will copy far less and will
remove any files added after the snapshot was taken (if invoked
appropriately). /orig should end up as a replica of /snap.

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