Re: WRITE_SAME support in FreeBSD nfsd NFSv4.1 mode?

From: Cedric Blancher <cedric.blancher_at_gmail.com>
Date: Sun, 12 Jan 2025 07:23:00 UTC
On Fri, 10 Jan 2025 at 16:02, Alan Somers <asomers@freebsd.org> wrote:
>
> On Thu, Jan 9, 2025 at 5:31 PM Dan Shelton <dan.f.shelton@gmail.com> wrote:
> >
> > Hello!
> >
> > Does FreeBSD nfsd support the WRITE_SAME request in NFSv4.1 mode?
> >
> > Dan
> > --
> > Dan Shelton - Cluster Specialist Win/Lin/Bsd
>
> Out of curiosity, what is your use case?

As discussed in the linux-nfs@ list, is a typical "big data" and
database accelerator, for example fast pattern fill (1 WRITE_SAME
command over the write, compared to <n> commands with data block,
where <n> is typically > 200 average), or just zero fill for blocks.
It's basically reducing network traffic dramatically.

Windows SMB 3.0 already supports that, and is a main selling point for
M$ to keep database people on the W$ platform. They even added several
Windows syscalls like
https://learn.microsoft.com/en-us/windows/win32/api/winioctl/ni-winioctl-fsctl_set_zero_data

Ced
-- 
Cedric Blancher <cedric.blancher@gmail.com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur