On Sun, Mar 03, 2024 at 12:01:12PM -0000, [email protected] wrote:
> oh okay
> reserved for root? I ran those commands as root, or you mean something
> else? I didn't know overhead was that big.. so this is okay, then?
> thanks for very fast reply
3.5G meta data overhead is less than 1.5% of your partition. Not that
high, I'd say.
Only root processes can write crossing the reserved space limit. The
disk will than show a Capacity number larger than 100%.
Non-root proceses will see failed writes.
You can change that 5% by using tunefs, or when doing newfs from the
start).
-Otto
>
> On Sun, March 3, 2024 11:57 am, Otto Moerbeek wrote:
> > On Sun, Mar 03, 2024 at 11:48:01AM -0000, [email protected]
> > wrote:
> >
> >
> >>
> >> disklabel -h sd3 shows this
> >>
> >> # /dev/rsd3c:
> >> type: SCSI
> >> disk: SCSI disk
> >> label: SR CRYPTO
> >> duid: some-number
> >> flags:
> >> bytes/sector: 512
> >> sectors/track: 63
> >> tracks/cylinder: 255
> >> sectors/cylinder: 16065
> >> cylinders: 31130
> >> total sectors: 500117600 # total bytes: 238.5G boundstart: 64
> >> boundend: 500117600
> >>
> >>
> >> 16 partitions:
> >> # size offset fstype [fsize bsize cpg]
> >> c: 238.5G 0 unused
> >> i: 238.5G 64 4.2BSD 4096 32768 26062 #
> >> /mnt/extssd
> >>
> >>
> >> but df -h shows that sd3i is of size 235G but only 223G is available,
> >> and the Used space is 4.0k.. SSD is new and I followed
> >>
> >
> > A fileystem has meta data overhead. That space is not avalailable for
> > user files. Also, by default 5% of available space is reserved for root
> > only. That fraction is represented in available space. See newfs(8).
> >
> > -Otto
> >
> >
>
>
