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Thu, 5 Jun 2025 04:17:20 -0400 (EDT) Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 05 Jun 2025 01:17:19 -0700 Message-Id: Subject: Re: Why does defragmenting break reflinks? From: "Christopher Snowhill" To: =?utf-8?q?=F0=9D=95=8D=F0=9D=95=96=F0=9D=95=9D=F0=9D=95=A0=F0=9D=95=94?= =?utf-8?q?=F0=9D=95=9A=F0=9D=95=97=F0=9D=95=AA=F0=9D=95=96=F0=9D=95=A3?= , "Ferry Toth" , "Qu Wenruo" , X-Mailer: aerc 0.20.1-0-g2ecb8770224a References: <9d74d71f-b65d-4f06-adb3-18f7698edb8a@velocifyer.com> <3fea5116-8532-4076-a824-620dc4c5a627@gmail.com> <1d6ac208-a08a-47e4-8c9f-9f99bd244146@velocifyer.com> In-Reply-To: <1d6ac208-a08a-47e4-8c9f-9f99bd244146@velocifyer.com> On Wed Jun 4, 2025 at 2:54 PM PDT, =F0=9D=95=8D=F0=9D=95=96=F0=9D=95=9D=F0= =9D=95=A0=F0=9D=95=94=F0=9D=95=9A=F0=9D=95=97=F0=9D=95=AA=F0=9D=95=96=F0=9D= =95=A3 wrote: > On 6/4/25 17:36, Ferry Toth wrote: >> Actually this makes defrag a very dangerous operation on disks with=20 >> many snapshots (> 20). When you would defrag each snapshot suddenly=20 >> your 5% full disk would be 100%. > > This actualy happend to me once because i forgot i had snapshots. Greater than 20 is a lot of snapshots? I guess I should stop using things like Snapper on my systems, then. It *defaults* to hourly snapshots of every subvolume you activate it on, pruned to the last 24 hours, so that's 24 alone. Then it keeps midnight for every day going back several weeks.