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From: Alan Somers <asomers@freebsd.org>
Date: Fri, 15 Nov 2024 09:40:17 -0700
Message-ID: <CAOtMX2j9-R=jX-CD0EF=tWBONGM7Bghhc1sxvdQ-oL1-VbUjwA@mail.gmail.com>
Subject: Re: improving nfs client & server performance
To: infoomatic <infoomatic@gmx.at>
Cc: freebsd-fs@freebsd.org
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On Fri, Nov 15, 2024 at 9:34=E2=80=AFAM infoomatic <infoomatic@gmx.at> wrot=
e:
>
>  From my personal experience, regarding the usage with ZFS:
>
> * SMR disks are are absolutely to avoid, their performance is horrible.
> * QLC SSD disks are also horrible in performance - after a short burst
> of performance they go back to spindling rust disks performance

To be clear, SMR disk performance is horrible ***on file systems that
weren't designed for them***.  That is to say, on every single legacy
file system.  Samsung claims to fully support SMR disks on F2FS, but
that's an overwriting file system.  Microsoft claims to fully support
SMR disks on ReFS.  But look more closely, and you'll see that not all
features are supported there.  So I'm not aware of any CoW file system
that fully supports SMR.  Any, that is, except for the one I wrote
myself.  Alas, I don't have funding to finish it to a production-ready
state ...