Date: Mon, 15 Nov 2021 17:35:56 +0100 From: Guido Falsi via freebsd-hackers <freebsd-hackers@FreeBSD.org> To: Rozhuk Ivan <rozhuk.im@gmail.com>, freebsd-hackers@FreeBSD.org Subject: Re: What happen with disk space? Message-ID: <d5881003-b7cb-3a45-0ec2-2b7b2e06bf6e@madpilot.net> In-Reply-To: <20211115185455.1cb9992a@rimwks.local> References: <20211115185455.1cb9992a@rimwks.local>
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On 15/11/21 16:54, Rozhuk Ivan wrote: > > > # df -cHi > Filesystem Size Used Avail Capacity iused ifree %iused Mounted on > .... > /dev/concat/16TB________.eli 16T 16T 9.0G 100% 22k 246M 0% /mnt/16TB________ > /dev/mirror/10T________.eli 9.7T 8.8T 124G 99% 45k 1.2G 0% /mnt/10T________ > /dev/gptid/87978976-10a9-11eb-ad6e-346346346346.eli 5.8T 4.1T 1.3T 76% 1.3M 732M 0% /mnt/backup > /dev/ada3p1.eli 5.8T 4.1T 1.3T 76% 1.3M 732M 0% /mnt/tmp > > Why Size != Used + Avail? AFAIK in UNIX it has always been like this, I guess since 4BSD at least, maybe even in v6. explanation is in minfree, -m option tu tunefs(8). part of the disk space is reserved for system usage and is accessible only to root. df(1) calculates avail based on that, while size is the actual full size (if I remember correctly). ZFS too shows the same behaviour. -- Guido Falsi <mad@madpilot.net>
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