topic Re: root file system in Operating System - HP-UX

root file system

Shivkumar — Sun, 14 Aug 2005 23:34:48 GMT

What are the names of the file systems which are considered under / file system on hpux ?

Thanks,
Shiv

Re: root file system

Rajeev Shukla — Sun, 14 Aug 2005 23:46:27 GMT

can you be more specific, do you mean directories or filesystem. Coz / itself is a filesystem (root filesystem)

Re: root file system

Yogeeraj_1 — Mon, 15 Aug 2005 00:01:21 GMT

hi,

/ is a file system already!

if you do bdf, you will see, for example:
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 204800 66328 137424 33% /

it is mounted on the /dev/vg00/lvol3

do you mean all the directories found on the root file system?

typically,
dev etc sbin

regards
yogeeraj

Re: root file system

Joseph Loo — Mon, 15 Aug 2005 00:04:50 GMT

hi shiv,

baffled by the question. anyway, do this to show all mounted file system:

# bdf
u will notice / itself is a file system.
# cd /
# lsf
u may then see which directories other than the mounted file systems are under /.

regards.

Re: root file system

morganelan — Mon, 15 Aug 2005 00:23:19 GMT

Hi,

I think under / file system, we can put some file systems such as /etc , /sbin, etc.
But we usually separate root file system under vg00, such as follow:
#bdf|grep vg00
/dev/vg00/lvol3 204800 121721 77966 61% /
/dev/vg00/lvol1 151509 54799 81559 40% /stand
/dev/vg00/lvol7 8388608 3173290 5052422 39% /var
/dev/vg00/lvol6 2097152 1116909 919076 55% /usr
/dev/vg00/lvol5 1048576 257657 742269 26% /tmp
/dev/vg00/lvol4 2097152 1449664 607039 70% /opt
/dev/vg00/lvol8 409600 158184 235740 40% /home

Re: root file system

Kurt Beyers. — Mon, 15 Aug 2005 01:00:30 GMT

Shiv,

Do a 'cat /etc/fstab' to see the file systems that are mounted under.

The file systems listed in the previous reply are the 'default' ones that are mounted under /. Of course your applications can mount other file systems, eg /u01 if you have an Oracle database.

best regards,
Kurt

Re: root file system

Mahesh Kumar Malik — Mon, 15 Aug 2005 01:17:48 GMT

Hi Shiv

/ is the basic root file system. There are no file systems under it. We have basically /etc for configurations files, /sbin for excutables etc...

Regards
Mahesh

Re: root file system

Cem Tugrul — Mon, 15 Aug 2005 02:32:07 GMT

Shiv,

/ basicly (root file system)and as Kurt's
description ;
Do a 'cat /etc/fstab' to see the file systems that are mounted under
and when you run the command;
#bdf
you can easily see already mounted Fs&mount
points

Good Luck,

Re: root file system

Babu A — Mon, 15 Aug 2005 04:51:02 GMT

Hi Shiv,

Normally vg00 becomes your root vg for any HP-UX system (HP recommends). Under vg00 you will have the following filesystems (i.e /, /stand, /var, /usr, /tmp, /opt, /home)

# bdf
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 229376 162680 66240 71% /
/dev/vg00/lvol1 327680 106576 219424 33% /stand
/dev/vg00/lvol8 2621440 106560 2495280 4% /var
/dev/vg00/lvol7 2686976 2016400 665392 75% /usr
/dev/vg00/lvol4 229376 8936 218792 4% /tmp
/dev/vg00/lvol6 2523136 1581224 934608 63% /opt
/dev/vg00/lvol5 32768 8432 24160 26% /home

You can also have different filesystem for crash.(i.e /var/adm/crash)

regards,

Babu

Re: root file system

Bill Hassell — Mon, 15 Aug 2005 07:35:05 GMT

I thinmk you are asking: what are the "normal" directories contained in the / filesystem, things like /dev /etc /sbin, etc. And that is a very good question to ask since sysadmin mistakes (or bad application software) can wrongly put files and directories in the / filesystem.

So here are some basic rules:

- The / filesystem is static, so it never grows significantly, typically 200 megs or less is more than enough space.

- The / directory should NEVER contain any files, only directories! In order to meet that requirement, root's home directory must be moved from it's (incredibly vulnerable) default location. I recommend creating /root, then move all files from / to /root and change /etc/passwd to reflect root's new home. DO this and you'll avoid becoming a member of the infamous rm -r * club.

- Here are the *only* top level directories in / that are not mountpoints:

/dev /sbin /etc /root

That's all! Anything else must be a mountpoint. A mountpoint is an empty directory which is used to attach another disk section (lvol) such as /tmp or /opt, etc.

- To see all the directories that are part of /, use the du command and sort the results:

du -kx / | sort -rn | head

It should look something like this:

95376 /
48696 /sbin
42840 /etc
26680 /etc/vx
21656 /etc/vx/type
14992 /sbin/fs
10512 /etc/opt
8776 /sbin/fs/vxfs3.5
8616 /etc/vx/type/static
6344 /etc/vx/type/gen

The du -kx / command looks only at the directories stored in /.