[Novalug] LVM Snapshots

John Holland jbholland@gmail.com
Sun Dec 19 10:16:33 EST 2010


I believe btrfs has writable snapshots similiar to ZFS.  RHEL 6 can use 
a btrfs root partition.

On 12/19/2010 10:07 AM, American Dave Kline wrote:
> On Sun, Dec 19, 2010 at 03:52:39AM -0500, James Ewing Cottrell 3rd wrote:
>>    Peter Larsen wrote:
>>
>> "Snapshots are fine; just don't mount your root on a snapshot."
>>
>> This is precisely the question I asked!
>>
>> Dave says "Yes, this is OK". Now who is right?
> Peter mentioned things that were important, that
> snapshots consume I/O and you'll have to worry about running out of
> space in a snapshot -- very important things to worry about with a root
> filesystem.  Hence my suggestion of --merge, which means if you like
> your snapshot you can merge it to its origin.
>
> Peter also gave a great LVM talk.
>
>> And BTW, there is No Such Thing as "lvconvert --merge". At least not in
>> CentOS 5.5.
> Correct.  RHEL 6, Fedora 14, etc, contain --merge.  CentOS is based off
> of RHEL 5 at present.  Red Hat is offering more affordable ways to get
> RHEL 6, you might want to have a look.
>
> Consider purchasing RHEL as an investment in CentOS's upstream.
>
> That said, I suppose you could try booting a live distro and merging
> the snapshot(s) using the live LVM.  I've never done this, but would
> investigate if it was important.
>
> Regards,
> -A. Dave
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