Re: [tlug] Current practices for Linux partioning?

[Edward Middleton <edward.middleton@example.com>]

On 04/13/2012 05:50 PM, Francois Cartegnie wrote:
> Le 13/04/2012 05:40, Christian Horn a écrit :
>> We can do this in LVM layer with the new 'thin provisioning' implemen-
>> tation which is in >=3.2 .  With a decent enough LVM you get then when
>> creating a volume group a /dev/vgroup/pool and logical volumes can take
>> from the pool - and put back which is unused.
> 
> Unfortunately, lvm is no match for btrfs, as it just manages the block
> layer. btrfs does on-line resizing ; Any change in lvm implies shutting
> off and resizing the filesystem.

I don't know about shrinking but online expanding has been working with
ext4 for a long time.

>> Its there for quite some time, for enterprise distros since RHEL6.0 or 6.1 .
>> Also working on LVM layer: you take a snapshot and perform your upgrade.
>> You then either decide that the upgrade went well and throw the snapshot
>> away, or you decide for the rollback and merge the snapshot back into the
>> original volume.
> 
> You'll have to change fstab & grub entries.
> With btrfs you just designate the new 'default' root subvolume.

No questioning brtfs has the potential to be better but no off-line
recovery is a bit of a show stopper.

Edward