Plans for BTRFS in Fedora

Peter Jones pjones at
Wed Feb 23 18:34:32 UTC 2011

On 02/23/2011 01:15 PM, Casey Dahlin wrote:
> On Wed, Feb 23, 2011 at 11:54:58AM -0600, Eric Sandeen wrote:
>> On 2/23/11 11:42 AM, Jesse Keating wrote:
>>> On 2/23/11 5:00 AM, Josef Bacik wrote:
>>>> This would be a great thing in general since the default ext* image is
>>>> shrunk down to be installed which creates a bad fs layout which has
>>>> performance implications.
>>> Can you expand upon this more?  The filesystem is shrunk down when the
>>> live image is built, but then once it is installed the fs is resized to
>>> fill out the physical disk / partition it is being installed to.
>> Shrinking down the filesystem tends to scramble it a bit.  All the allocator
>> decisions that were made based on fs size at the time of install go out the
>> window as resize2fs fills in every hole it can find to maximally compress the
>> fs.
> Is there some sort of "sparsifying defrag" we could do after copying the image
> over? The dd-based install is so fast that we could actually afford another
> pass if we needed it IMHO.

Just as soon as you write it ;)


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