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[69.171.146.205]) by smtp.gmail.com with UTF8SMTPSA id 6a1803df08f44-882389916d4sm7346726d6.22.2025.11.07.18.10.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Nov 2025 18:10:37 -0800 (PST) From: Nicholas D Steeves To: Andrei Borzenkov , linux-btrfs@vger.kernel.org Subject: Re: RAID1 vs RAID10 In-Reply-To: References: <20251020122115.GA1461277@tik.uni-stuttgart.de> Date: Fri, 07 Nov 2025 21:10:34 -0500 Message-ID: <87cy5txoit.fsf@gmail.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Andrei Borzenkov writes: > On Mon, Oct 20, 2025 at 3:23=E2=80=AFPM Ulli Horlacher > wrote: >> >> >> I have just discovered, that RAID1 is possible with more than 2 devices: >> >> https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html#profiles >> >> What is the difference to RAID10? >> > > In RAID1 each chunk (copy) is located on a single disk. In RAID10 each > chunk (copy) is striped across multiple disks. > > https://lore.kernel.org/linux-btrfs/87v8qokryt.fsf@vps.thesusis.net/T/ Does the RAID10 profile still have equivalent read-speed to RAID1 profile on recent (>=3D6.12) kernels? Last I looked into it both were still limited to the speed of a single-device. 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