Re: [Devil-Linux-discuss] Support for LVM restore from snapshot

[Heiko Z. <he...@zu...>]

Quoting Dominic Raferd <dl...@ed...>:

> On 02/01/2011 23:26, Heiko Zuerker wrote:
>> Quoting Dominic Raferd<dl...@ed...>:
>>> LVM2 since 2.02.58 supports an option (lvconvert --merge) to merge back
>>> an LVM snapshot to an original source. This allows to you create a
>>> snapshot, then make 'dangerous' changes to the original source, and
>>> afterwards, if unhappy with the changes, simply restore the snapshot to
>>> recover the original data.
>>>
>>> This is potentially very useful but I don't think it will work
>>> because the man page [for LVM 2.02.76] says "To check if your kernel
>>> supports this feature, look for 'snapshot-merge' in the output of
>>> 'dmsetup targets'" And when I do this in DL I don't see snapshot-merge
>>> listed.
>>>
>>> Info about kernel device-mapper snapshot support here:
>>> http://alinux.tv/Kernel-2.6.34/device-mapper/snapshot.txt
>>> LVM2 changelog here: ftp://sources.redhat.com/pub/lvm2/WHATS_NEW
>>>
>>> Can I ask for this option (snapshot-merge) to be added to DL  
>>> kernel for the next mini-release,
>>> please (and upgrade LVM to 2.02.79)?
>> Unfortunately we froze the Kernel release to 2.6.32.x, since this is
>> the long-term stable.
>>
>> The next major release of DL will have the latest kernel, but we're
>> not even anywhere close to an alpha release.
>>
>> The only way for you to get is, is to create a custom version of DL
>> with the latest 2.6 kernel.
> I think the more recent 'longterm' kernel is 2.6.35.10, which would have
> the snapshot-merge support. But I will have to be patient...

You are absolutely correct, but unfortunately grsecurity doesn't  
supply patches for it. :(

-- 

Regards
   Heiko Zuerker
   http://www.devil-linux.org


----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.