Harddisk Problem

[Simon]

Here is why: 

manufacturers consider 1GB = 1,000,000,000 bytes, so 80gb drive
is really 80,000,000,000 / 1024 / 1024 / 1024 = 74.5GB Now,
why you get 68 usable space out of 73gb? 8% of usable space
is held back by freebsd due to performance issues. You can
change this to 0%, but it is not suggested. If you still want to,
read man tunefs, option -m

-Simon


On Sat, 11 Oct 2003 00:29:55 +0300, PsYxAkIaS (FreeBSD) wrote:

>Hello,
>
>We just installed and mounted a 2nd HDD(secondary ide channel) on a Dedicated Server on FreeBSD 4.8 and look what it gives:
>
>] df 
>Filesystem 1K-blocks   Used  Avail Capacity Mounted on
>/dev/ad0s1a  2015918  52114 1802532   3%  /
>/dev/ad0s1f 22479870 16924774 3756708  82%  /usr
>/dev/ad0s1e  4031950  73418 3635976   2%  /var
>procfs       4    4    0  100%  /proc
>/dev/ad2s1e 76958474    4 70801794   0%  /drive2
>
>] df -h
>Filesystem  Size  Used Avail Capacity Mounted on
>/dev/ad0s1a  1.9G  51M  1.7G   3%  /
>/dev/ad0s1f  21G  16G  3.6G  82%  /usr
>/dev/ad0s1e  3.8G  72M  3.5G   2%  /var
>procfs    4.0K  4.0K   0B  100%  /proc
>/dev/ad2s1e  73G  4.0K  68G   0%  /drive2
>
>] cat /etc/fstab
># See the fstab(5) manual page for important information on automatic mounts
># of network filesystems before modifying this file.
>#
># Device                Mountpoint      FStype  Options         Dump    Pass#
>/dev/ad0s1b             none            swap    sw              0       0
>/dev/ad0s1a             /               ufs     rw              1       1
>/dev/ad0s1f             /usr            ufs     rw              2       2
>/dev/ad0s1e             /var            ufs     rw              2       2
>/dev/acd0c              /cdrom          cd9660  ro,noauto       0       0
>proc                    /proc           procfs  rw              0       0
>/dev/ad2s1e             /drive2         ufs     rw              2       2
>
>The problem is that from 73GB (80gb hdd) it only sees free 68GB.
>
>How can i check if it has bad sectors? A friend suggested me low-level format but I never done that before under unix.
>
>Also, do i need to be in single-user (I dont have physical access, only remote root via ssh).
>
>
>Thank you.
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