Harddisk Problem

[Bill Vermillion]

When asked his whereabouts on Sat, Oct 11, 2003 at 11:57 , 
Lachlan took the fifth, drank it, and then slurred:

This really isn't an ISP related issue and more probably it should
have been posted to FreeBSD-questions - but:

> On some hdd's there is an option on the jumper settings next to
> master and slave. That for some reason, limits the size of the
> hdd. I don't know why this option exists, but it does. Also,
> you never get 70GB out of a 70GB hdd. Once again, i don't know
> why. It's just the way it is.

He really should try df with the  -H option <note CAPITAL H>

He may find his space is there. Note this system as below - with
the first output using -h and the second using -H.

Note particularl /dev/ad0s2g.  Add the total of used and available
and you come up with  28.8G total space with -h but you
get 31.1G with the -H.   Extroplating that to his larger
drive I suspec he will see the correct amount.

The -H is 'human readble' and it is a decimal byte count - the way
manufacturers show their drives with 1,000,000 bytes equalling 1MB,
while the -h used blocks of 1024 and thus will look like there is
less space.

Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/ad0s2a   123M    43M    70M    38%    /
/dev/ad0s2g    32G   3.8G    25G    13%    /usr
/dev/ad0s2f   3.9G   2.0K   3.6G     0%    /usr2
/dev/ad0s2e   123M    30M    83M    27%    /var
procfs        4.0K   4.0K     0B   100%    /proc

Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/ad0s2a   129M    45M    73M    38%    /
/dev/ad0s2g    34G   4.1G    27G    13%    /usr
/dev/ad0s2f   4.2G   2.0K   3.9G     0%    /usr2
/dev/ad0s2e   129M    31M    87M    27%    /var
procfs        4.1K   4.1K     0B   100%    /proc
> 
> -----Original Message-----
> From: owner-freebsd-isp at freebsd.org [mailto:owner-freebsd-isp at freebsd.org]On
> Behalf Of PsYxAkIaS (FreeBSD)
> Sent: Saturday, October 11, 2003 7:30 AM
> To: freebsd-isp at freebsd.org
> Subject: Harddisk Problem
> 
> 
> 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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> 
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-- 
Bill Vermillion - bv @ wjv . com