another interesting idea (zfs based upgrades)

[Adam Miller]

Well now that btrfs has been mentioned ..... :)

Are we planning to adopt it as default soon as upstream releases
stable? or possibly just shoot for alternative if default would be too
ambitious?

-Adam

2009/3/26 Jonathan Dieter <jdieter at gmail.com>:
> On Thu, 2009-03-26 at 14:30 -0400, Seth Vidal wrote:
>>
>> On Thu, 26 Mar 2009, Neal Becker wrote:
>>
>> > http://tech.xerces.com/unbreakable-upgrades-zfs-and-apt-get.geek
>> >
>>
>> Here's how this would work in the yum world:
>>
>> 1. if any package from @core (or any of their deps) are being upgraded
>> then run an lvm snapshot and store it/add it to grub
>> 2. proceed with update
>>
>> If anyone would like to write the lvm snapshot rootfs and store/add it to
>> grub I can write the yum plugin to do the rest.
>>
>> It's not radically exciting code.
>>
>> In yum you wouldn't even need to stop the yum update command and ask the
>> user to run a separate program.
>
> My experience with lvm snapshotting was that it slowed down disk speeds
> significantly.  I would expect that filesystem based snapshotting (which
> btrfs will have) might be more efficient.  Or we could make sure the
> snapshot is only left long enough to make sure the updates work.
>
> Jonathan
>
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