Re: Harddisk Problem

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To: "freebsd-isp@freebsd.org" <freebsd-isp@freebsd.org>, "PsYxAkIaS (FreeBSD)" <freebsd@psyxakias.com>
Date: Sat, 11 Oct 2003 01:50:20 -0400

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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