Re: I would like to propose that we turn on XFS Reflink in Fedora 29 by default

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On 5/2/18 8:42 AM, Ian Pilcher wrote:
> On 05/02/2018 08:25 AM, Eric Sandeen wrote:
>> I've always seen the need for shrink as an indicator that someone had
>> poor planning along the way, or insufficient tools for provisioning to
>> start with.  Sure, there are exceptions, but in general who needs shrink
>> on a regular basis?
> 
> The point isn't so much that you need it on a regular basis, it's that
> when you need it, you *really* need it.

Given that it is exception activity, dump/mks/restore is also a less
convenient but more robust solution to the problem.

I mostly want to point out that shrink permanently de-optimizes your
filesystem, and carries some risk as well, especially if you have no
backups.

> I'll buy the poor planning argument on a server that does pretty much
> the same thing for the entirety of its life/deployment, but the case of
> a laptop/desktop that goes years without being reinstalled, and then
> unexpectedly needs tens of gigabytes of space to bisect a kernel bug
> is very different.

If you're putting your years-old root or home filesystem at risk to bisect
a bug I'd humbly suggest that an external or additional disk might be more
suited to the task.

I don't have any real horse in this race - if Fedora feels that shrink
capability trumps features like reflink, that's fine.  Just offering my
thoughts on the matter, and trying to point out that shrink has its
downsides.

-Eric
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