[systemd-devel] Antw: [EXT] Re: [systemd‑devel] systemd‑nspawn container not starting on RHEL9.0

[Neal Gompa]

On Thu, Aug 11, 2022 at 3:15 AM Ulrich Windl
<Ulrich.Windl at rz.uni-regensburg.de> wrote:
>
> >>> Lennart Poettering <lennart at poettering.net> schrieb am 10.08.2022 um 22:09
> in
> Nachricht <YvQQhcDJw9aIbgxc at gardel-login>:
> > On Mi, 10.08.22 10:13, Thomas Archambault (toma at TPArchambault.com) wrote:
> >
> >> Thank you again Lennart, and thx Kevin.
> >>
> >> That makes total sense, and accounts for the application's high level
> >> start‑up delay which appears to be what we are stuck with if we are over
> >> xfs. Unfortunately, it's difficult to dictate to the client to change
> their
> >> fs type, consequently we can't develop / ship a tool with that baseline
> >> latency on our primary target platform (RHEL xx.)
> >>
> >> So the next obvious question would be, is XFS reflink support on the
> >> systemd‑nspawn roadmap or actually, (and even better) has support been
> >> incorporated already in the latest and greatest src and I'm just behind
> the
> >> curve working with the older version of nspawn as shipped in RHEL90?
> >>
> >> I'm asking because according to the RHEL 9 docs
> >
> (https://access.redhat.com/documentation/en‑us/red_hat_enterprise_linux/9/html‑
>
> >
> single/managing_file_systems/index#the‑xfs‑file‑system_assembly_overview‑of‑availa
> > ble‑file‑systems)
> >> it's the current default fs and is configured for "Reflink‑based file
> >> copies."
> >
> > We issue copy_file_range() syscall, which should do reflinks on xfs,
> > if it supports that. Question is if your kernel supports that too. I
> > have no experience with xfs though, no idea how xfs hooked up reflink
> > initially. And we never tested that really. I don't think outside RHEL
> > many people use xfs.
>
> Not true: For SUSE /home is typically using XFS, and we use it with SLES for
> (huge) database filesystems.
>

In openSUSE, this hasn't been the default behavior for a while. SLES
will catch up here eventually.


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