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List:       fedora-devel-list
Subject:    Re: Fedora 32 System-Wide Change proposal: Enable fstrim.timer by default
From:       Louis Lagendijk <louis () fazant ! net>
Date:       2020-01-03 18:47:50
Message-ID: 700c53eb145f4359113f92dcd69edb105e990e5d.camel () fazant ! net
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On Fri, 2020-01-03 at 10:21 -0700, Chris Murphy wrote:
> On Fri, Jan 3, 2020 at 9:06 AM Robbie Harwood <rharwood@redhat.com>
> wrote:
> > Nico Kadel-Garcia <nkadel@gmail.com> writes:
> > 
> > > On Thu, Jan 2, 2020 at 2:48 PM Robbie Harwood <
> > > rharwood@redhat.com> wrote:
> > > > "John M. Harris Jr" <johnmh@splentity.com> writes:
> > > > > On Friday, December 20, 2019 10:59:52 AM MST Chris Murphy
> > > > > wrote:
> > > > > 
> > > > > > Issuing the command once per week harms no one
> > > > > 
> > > > > Based on what's actual in the Change proposal, this is not
> > > > > the case.
> > > > > 
> > > > > Even if this goes through, in my opinion, it should only
> > > > > affect the
> > > > > GNOME Spin, or perhaps even "all graphical" spins at most.
> > > > 
> > > > No?  This is extremely useful for cloud environments - maybe
> > > > the most
> > > > useful.  It allows VM hosts to reclaim and reuse empty disk
> > > > space;
> > > > otherwise, the disk images just bloat to their maximum allowed
> > > > size.
> > > 
> > > Its most useful for the cloud *providers*, not the cloud clients.
> > > For
> > > the clients, getting the AWS space pre-allocated form EBS is
> > > often a
> > > notable performance improvement, and restoring it to AWS saves
> > > AWS
> > > resources. Not the client system performance.
> > 
> > Sure, but in many cases the client is also the provider.  Consider
> > running kvm on a laptop (which I and many others do for work...) -
> > you'd
> > really like the disk space back you're not using, rather than each
> > VM
> > taking 10-20G it doesn't need.  I end up having to edit every VM
> > configuration in two places after each install/provision in order
> > to get
> > that behavior - that's not reasonable.
> 
> By default, GNOME Boxes and virt-manager VM's, do not enable block
> device discards. So this feature is a 'no op' in that case. And also
> fstrim.service won't run in a container. I've updated the feature to
> reflect these two things.
> 
virt-manager does not enable discards on IDE or virtio disks. I think
it DOES enable discard on SCSI disks. So strictly speaking the above is
true as long as the default emulation layer is not SCSI but it is a
matter of a few clicks to enable it.

> 

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