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Tue, 30 May 2023 11:57:39 -0700 (PDT) Date: Tue, 30 May 2023 20:57:35 +0200 From: Kira To: questions@freebsd.org Subject: Re: read and write back full disk to trigger relocation User-Agent: K-9 Mail for Android In-Reply-To: <20230530162513.GK1030@lena.kiev> References: <1957739901.520492.1685310340560@ichabod.co-bxl> <20230530162513.GK1030@lena.kiev> Message-ID: <57872865-4512-4B27-9848-4B6AC1EDC880@gmail.com> List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=----RV0BWXF6DJ3QGOD2LAJ2QSV5SKLL5M Content-Transfer-Encoding: 7bit X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20221208]; 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charset=utf-8 Content-Transfer-Encoding: quoted-printable
No, SSDs have entirely different= behaviour, you just lover SSD life by doing so=2E

SSDs automaticall= y refresh decaying data=2E To be sure you may want to read all of it like s= o:

dd if=3D/dev/ssddev of=3D/dev/null bs=3D1m


30 =D0=BC=D0=B0=D1=8F 2023 =D0=B3= =2E 18:25:13 GMT+02:00, Lena@lena=2Ekiev=2Eua =D0=BF=D0=B8=D1=88=D0=B5=D1= =82:
From the dd(1) manpage:

     Do a refresh of a disk d=
rive, in order to prevent presently recoverable
     read errors from pr=
ogressing into unrecoverable read errors:

           dd if=3D/dev/ad=
a0 of=3D/dev/ada0 bs=3D1m

That won't trigger relocation, but it will=
 refresh the decaying data=2E

W= ould that be useful for SSD?

<= /html> ------RV0BWXF6DJ3QGOD2LAJ2QSV5SKLL5M--