[linux-lvm] Snapshots

[Mark Woodward]

On 02/16/2012 08:57 AM, Mike Snitzer wrote:
> On Thu, Feb 16 2012 at  8:25am -0500,
> Mark Woodward<markw at mohawksoft.com>  wrote:
>
>> I have been looking into LVM2 for a while now and while I think it
>> is useful for a range of applications, its seems pretty limited in
>> overall scope.
>>
>> Is there any active development happening? Most of the code seems
>> like bug-fixes or minor tweaks. Is the snapshot system being
>> improved? Specifically, snapshots of snapshots? thin provisioned
>> snapshots or auto-expand (i.e. snapshots don't run out of space).
>> If you look at technologies like ZFS snapshots are far better
>> supported, but ZFS will probably never be real under Linux, and it
>> really is far more than is really needed.
>>
>> So, I guess my questions are these: Is LVM in maintenance mode or is
>> there active development? If it is being actively developed, is
>> there a road map and is there a group or site specifically dedicated
>> to the development?
> Um, where are you even getting this idea that LVM2 is in maintenance
> mode?  Or that snapshots haven't improved?
>
> Sorry to come off defensive but your entire post is founded on incorrect
> understanding.

Understood, I apologize.
> Anyway, if you look at the change history of the lvm2 repository (be it
> cvs or git, cvs commits are mirrored to git) you'll see there have been
> regular changes flowing in and most recently a very extensive evolution
> of the code to add support for thin provisioning with highly efficient
> snapshots (ala btrfs or ZFS).
I guess I missed that. I need to check out the changes, looks like you 
have auto-grow with monitoring? I was looking more towards the 
"snapshots of snapshots" ability. Is that on the radar?

> try: git clone git://sources.redhat.com/git/lvm2
>
> take a look at the WHATS_NEW file and tell me what you think.
>
> Mike