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Date:      Mon, 21 Aug 2023 14:05:36 +0100
From:      Kaya Saman <kayasaman@optiplex-networks.com>
To:        questions@freebsd.org
Subject:   Re: tmpfs(5) (was: ZFS Root size keeps going down after upgrade to 13.2-release)
Message-ID:  <7acf71ee-375d-1ee3-4000-29ea5a821b2d@optiplex-networks.com>
In-Reply-To: <5867a6b1-6cdf-894d-0635-d7911c4a9ecc@gmail.com>
References:  <8f3b445d-3f55-f359-ce5e-0d86c57755fe@optiplex-networks.com> <20230821130132.50aeb96b51b2b71efa14cb94@sohara.org> <8dbe0d99-ca94-998d-0c4e-27642db1b11a@optiplex-networks.com> <f6e34b33-d666-40b8-9fbb-59b679a3a124@gmail.com> <3f71983d-9f00-dddb-a05a-03b4322cb423@optiplex-networks.com> <33a06143-e2d8-d44a-d7de-9d02d67179fd@optiplex-networks.com> <5867a6b1-6cdf-894d-0635-d7911c4a9ecc@gmail.com>

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On 8/21/23 13:58, Graham Perrin wrote:
> On 21/08/2023 13:45, Kaya Saman wrote:
>> =E2=80=A6
>>
>> df -h
>> Filesystem=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Size=C2=A0=C2=A0=C2=A0 Used=C2=A0=
=C2=A0 Avail=20
>> Capacity=C2=A0 Mounted on
>> zroot/ROOT/default=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 37G=C2=A0=C2=A0=C2=A0=C2=A0 36G=C2=A0=C2=A0=C2=A0 720M 98%=C2=A0=C2=A0=
=C2=A0 /
>> devfs=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1.0K=C2=A0=
=C2=A0=C2=A0 1.0K=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0B 100%=C2=A0=C2=A0=C2=A0=
=20
>> /dev
>> tmpfs=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 26G=
=C2=A0=C2=A0=C2=A0 4.0K=C2=A0=C2=A0=C2=A0=C2=A0 26G 0% /tmp
>>
>>
>> 26GB for /tmp ?=20
>
>
> Available, not used.
>
> From the (very) little that I know about tmpfs(5), I don't imagine=20
> this solving your puzzle about sizes in relation to boot environments.
>
> <https://man.freebsd.org/cgi/man.cgi?query=3Dtmpfs&sektion=3D5&manpath=3D=
freebsd-release>=20
>
>
>

I did find this in the meantime:=20
https://forums.freebsd.org/threads/tmpfs-size-limit.26701/ in addition.


Looks like /tmp is only 121MB in the file system while the rest is being=20
used by RAM.

zroot/tmp=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 121M=C2=A0=C2=A0 721M 121M=C2=A0 /tmp


I do have this line in fstab:

tmpfs=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /tmp=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tmpfs rw,nosuid,mode=3D01777=C2=A0=C2=
=A0=C2=A0=20
0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0


It still doesn't help in any case why deleting files strikes them off=20
the file list but doesn't touch the disk itself?


Hopefully there will a solution down the line and hopefully I will learn=20
something too.... currently my mind seems to be blocked however, in=20
which direction to even approach this problem and especially what to=20
look at :-(




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