Stupid question regarding ZFS and `df -h` output
William A. Mahaffey III
wam at hiwaay.net
Mon Apr 11 05:19:12 UTC 2016
On 04/10/16 22:08, Eric S Pulley wrote:
> On Sun, 10 Apr 2016 15:00:13 +0300
> Aleksander Alekseev <afiskon at devzen.ru> wrote:
>
>> Hello
>>
>> I installed FreeBSD using steps like "Next -> Next -> ZFS -> use
>> entire disk and don't bother me with stupid questions -> Next"
>>
>> I have 128 Gb hard drive:
>>
>> ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
>> ada0: <TOSHIBA THNSNS128GMCP TA4ABBF0> ATA8-ACS SATA 3.x device
>> ada0: Serial Number 82GS10GGT2GY
>> ada0: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 8192bytes)
>> ada0: Command Queueing enabled
>> ada0: 122104MB (250069680 512 byte sectors)
>>
>> And here is `df -h` output:
>>
>> Filesystem Size Used Avail Capacity Mounted on
>> zroot/ROOT/default 95G 21G 74G 22% /
>> devfs 1.0K 1.0K 0B 100% /dev
>> zroot/tmp 75G 153M 74G 0% /tmp
>> zroot/usr/home 89G 15G 74G 17% /usr/home
>> zroot/usr/ports 75G 859M 74G 1% /usr/ports
>> zroot/usr/src 76G 1.2G 74G 2% /usr/src
>> zroot/var/audit 74G 96K 74G 0% /var/audit
>> zroot/var/crash 75G 930M 74G 1% /var/crash
>> zroot/var/log 74G 360K 74G 0% /var/log
>> zroot/var/mail 74G 188K
>> 74G 0% /var/mail zroot/var/tmp 74G 136K
>> 74G 0% /var/tmp zroot 74G 96K 74G
>> 0% /zroot
>>
>> How exactly should I read this to get result "all 128 GB are used"?
>>
> You have to change your way of thinking a little with ZFS. On my full
> ZFS systems I usually make a shell alias for df to actually run `zfs
> list -o mountpoint,quota,used,avail`. and I have quotas set on the
> "traditional" mountpoints.
>
> Mess around with the -o options to zfs list until it tells you want you
> want to see.
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.... & of course remember that HDD manufacturers report sizes in
KB/MB/GB (base 10), while the booted OS uses KiB/MiB/GiB (base 2) ....
--
William A. Mahaffey III
----------------------------------------------------------------------
"The M1 Garand is without doubt the finest implement of war
ever devised by man."
-- Gen. George S. Patton Jr.
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