Re: Mounting xfs filesystem takes long time

[Chris Murphy <lists@colorremedies.com>]

On Thu, Jun 21, 2018 at 4:19 PM, Dave Chinner <david@fromorbit.com> wrote:

> The mkfs ratios are about as optimal as we can get for the
> information we have about the storage - growing by
> 10x (i.e.  increaseing the number of AGs by 10x) puts us at the
> outside edge of the acceptible filesystem performance and longevity
> charcteristics. Growing by 100x puts us way outside the window,
> and examples like this where we are taking about growing by 10000x
> is just way beyond anything the static AG layout architecture was
> ever intended to support....

OK that's useful information, thanks.

What about from the other direction; is it possible to make an XFS
file system too big, on an LVM thin volume?

For example a 1TB drive, and I'm scratching my head at mkfs.xfs time
and think maaaybe one day it could end up 25TB at the top end? So I
figure do mkfs.xfs on a virtual LV of 5TB now and that gives me a 5x
growfs if I really do hit 25TB one day. But for now, it's a 5TB XFS
file system on a 1TB drive. Is there any negative performance effect
if it turns out I never end up growing this file system (it lives
forever on a 1TB drive as a 5TB virtual volume and file system)?



-- 
Chris Murphy