topic Re: auto mount in Operating System - HP-UX

auto mount

Yarok — Sun, 30 Jan 2011 13:58:39 GMT

Hello,

Each time I am rebooting the HP UX machine, the mount for all other machines are lost.
Is there any possible to ensure it would not happend?
If so, how?

Thanks,

Yaron

Re: auto mount

DeafFrog — Sun, 30 Jan 2011 14:46:00 GMT

Hi ,

have not you mentioned them in /etc/fstab ,
(expect when FS is in cluster)
what tye of application you have on servers..how does this application utilizes the underlying disk structure , please provide more details.A fstab should look like this :

~
/dev/vg01/mango08 /mango08 vxfs defaults 0 2
/dev/vg01/mango09 /mango09 vxfs defaults 0 2
/dev/vg01/mango10 /mango10 vxfs defaults 0 2
/dev/vg01/mango11 /mango11 vxfs defaults 0 2
/dev/vg01/mango12 /mango12 vxfs defaults 0 2
/dev/vg01/mango13 /mango13 vxfs defaults 0 2
/dev/vg01/mango14 /mango14 vxfs defaults 0 2

Regards,

Re: auto mount

DeafFrog — Sun, 30 Jan 2011 15:07:31 GMT

Hi ,

i misread the thread "the mount for all other machines are lost"....i guess you are having NFS export form the server and having the NFS client to mount the same .

Regards,

Re: auto mount

Yarok — Sun, 30 Jan 2011 15:22:05 GMT

Hello,

No, I didn't mention it.
Indeed, it is NFS and I dont quite sure who is the server and who is the client (I read that it could be both).

Now I looked on other HP machin on the fstab file and I have seen your meaning. Let me be more familiar with the line from it:

ednop:/vol/vol0/scc /ednop nfs rw,suid,soft,bg 0 0

Please let me know what are the following refer to:
ednop:/vol/vol0/scc /ednop nfs rw,suid,soft,bg 0 0

for example:
ednop - machine name (i know)
vol,vol0,scc (i know)

rw?
suid?
soft?
bg?
0,0?

should I define it by myself? what are the defenitions options I have?
regards.

Re: auto mount

Ismail Azad — Sun, 30 Jan 2011 16:07:13 GMT

Hi Yaron/Yarok,

First check if your NFS server is permanently sharing the filesystem in /etc/dfs/dfstab on 11.31 and /etc/exports on 11.23 and check on the client side if the nfs entry is there for mounting permanently on /etc/fstab. This is an approach to your problem.

OK, so what i understand from your query is what are mount options . Now these are some options for mount...

ro/rw :- exapansion read only/read write
suid/nosuid :- Do u want suid bit set??
quota/noquota :- Do u want a filesystem quota set?

The 0 0 refers to backup frequency and fsck order. Backup frequency is like a "dummy" field in modern HPUX operating systems but you still need a placeholder 0 over there.

soft on NFS would refer to a soft mount. You will also see options on NFS mounts that deal with the behaviour of the NFS substystem when the NFS server hangs. Don't forget to assign appropriate points. :)

Regards
Ismail Azad

Re: auto mount

Dennis Handly — Sun, 30 Jan 2011 16:13:46 GMT

If you want to mount them on each reboot, you list then in /etc/fstab. If you are using the automounter, you don't list there, you put them in the automounter maps.

>I don't quite sure who is the server and who is the client.

You better know this.

>ednop:/vol/vol0/scc /ednop nfs rw,suid,soft,bg 0 0

You are mounting it R/W, you allow SUID programs. Your retry is soft.
See mount_nfs(1M):
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02264554/c02264554.pdf

Re: auto mount

Ismail Azad — Sun, 30 Jan 2011 19:17:13 GMT

Hi,

Just adding to Mr. Dennis Handly's comments. Since your topic is "auto mount", if you remove that space the terminology typically relates to AutoFS. But I don't think you (Yarok) are talking about direct, special or indirect maps. In case you are, the NFS client side service involves one essential file called as AUTOFS master map. You don't mention it in /etc/fstab, it automatically mounts and unmounts depending on access and idle time respectively.

Regards
Ismail Azad

Re: auto mount

Yarok — Wed, 02 Feb 2011 12:40:45 GMT

Hello Ismail,
Sorry for the dalay with assigning points and answer.

The OS does not have the file /etc/dfs/dfstab
I dont know what is 11.31 and 11.23.
Do you prefer that I will attach the files: /etc/dfstab /etc/mnttab and /etc/exports.?

Please advice.

Re: auto mount

Dennis Handly — Wed, 02 Feb 2011 12:56:37 GMT

>The OS does not have the file /etc/dfs/dfstab

It isn't likely to be there on 11.23, just a dummy one.

>I don't know what is 11.31 and 11.23.

This is scary, 11i v2 and 11i v3. Look at: uname -a

>Do you prefer that I will attach the files: /etc/dfstab /etc/mnttab and /etc/exports?

We mostly care about /etc/fstab.

Re: auto mount

Yarok — Wed, 02 Feb 2011 13:24:04 GMT

the version is 11.11;
uname -a shows:

B.11.11 U 9000/785

I attached the file.

Re: auto mount

Dennis Handly — Wed, 02 Feb 2011 13:48:21 GMT

>the version is 11.11;

Ok, you have workstation on an even older version (and that isn't like 11.31 either). :-)

You fstab entry indicates NO NFS mounts at all. So you could have been using the automounter to mount NFS filesystem.

Is it running? ps -fu root | grep auto

Re: auto mount

Yarok — Wed, 02 Feb 2011 13:58:44 GMT

I dont think so...

it says:

root 19394 4268 0 13:56:16 pts/1 0:00 grep auto

Re: auto mount

Dennis Handly — Wed, 02 Feb 2011 21:05:32 GMT

So you aren't using the automounter. You either need to start or you need to add entries in fstab for each NFS filesystem you want to mount.

Were you mounting these before by an explicit script/command?

Re: auto mount

Yarok — Thu, 03 Feb 2011 09:23:27 GMT

Dear Dennis and Ismail

I checked the command ps -fu root | grep auto
in OTHER HP machine and the results are:

autofs_proc
/usr/lib/netsvr/fs/auto/automount

I attach the fstab file of this machine as well. what is the difference between nfs and vxfs mount?

1. Does it mean the mount will be activated automatically when rebooting the system?
2. Should I do the same in the problematic machine? if so how?
3. What is the fanction of /etc/mnttab file? can i edit it?

BR,

Yaron

Re: auto mount

Dennis Handly — Thu, 03 Feb 2011 11:49:27 GMT

>in OTHER HP machine and the results are:
autofs_proc
/usr/lib/netsvr/fs/auto/automount

This machine is running the automounter.
You could look at the differences in /etc/fstab and /etc/mnttab to see what is currently automounted.
(Or root explicitly invoked mount/umount.)

>I attach the fstab file of this machine as well. What is the difference between nfs and vxfs mount?

vxfs, like hfs is local. NFS is remote.

You have two NFS file systems that are mounted on each boot:
planet2:/vol/scc/scc /planet2 nfs defaults
ednop:/vol/vol0/scc /ednop nfs rw,suid,soft,bg

>1. Does it mean the mount will be activated automatically when rebooting the system?

Yes for every FS in /etc/fstab, unless it says ignore or noauto.

>2. Should I do the same in the problematic machine? if so how?

Just edit the file and do: mount -a

>3. What is the function of /etc/mnttab file? can I edit it?

To show you what is mounted now. No, this file is basically for display purposes only.

Re: auto mount

Ismail Azad — Thu, 03 Feb 2011 11:52:43 GMT

Hi Yaron,

First please let us know if you are trying to do an "automount" with AutoFS or are you trying to permanently mount an NFS filesystem.

However, as of now I can answer some of the questions you asked which could prob clear some things.

> I attach the fstab file of this machine as well. what is the difference between nfs and vxfs mount?

A normal vxfs mount is on the local filesystem. It means the filesystem is the servers "own". An NFS filesystem is mounted from another server on the client side and the NFS subsystem is often referred to as a "diskless" based system.

1. Does it mean the mount will be activated automatically when rebooting the system?

Mount at rebooting for both local vxfs and NFS mounts should have an entry in /etc/fstab.
3. What is the fanction of /etc/mnttab file? can i edit it?

/etc/mnttab is your "local mount table". You cannot edit it. You can cat it but not vi. If you try to vi you will see a BLANK SCREEN. Hope this helps.

Regards
Ismail Azad

Re: auto mount

Yarok — Thu, 03 Feb 2011 13:09:28 GMT

thanks a lot Mr. Dennis and Mr. Ismail.

Now Iv entered into /etc/fstab the relevant automount clients. I will rebooted when possible to see if it holds :)

Thanks for the information as well.

Best regards,

Yaron.

Re: auto mount

Dennis Handly — Fri, 04 Feb 2011 10:06:02 GMT

>I've entered into /etc/fstab the relevant automount clients.

Did you mount them with "mount -a"?

>Ismail: the NFS subsystem is often referred to as a "diskless" based system.

I've only seen diskless to indicate that there are no local disks at all and it boots over NFS.

>You cannot edit it. You can cat it but not vi. If you try to vi you will see a BLANK SCREEN.

You can attempt to edit it but it won't do you any good. In vi, I see all of the mounted filesystems.

Re: auto mount

Ismail Azad — Fri, 04 Feb 2011 12:35:04 GMT

Hi,

> Dennis

I've only seen diskless to indicate that there are no local disks at all and it boots over NFS.

Yes let me rephrase : the NFS subsystem is "at times" referred to as a "diskless" based system and yes it's in only the scenario you mentioned {probably not apt terminology}. My mistake BUT

> Dennis

Let me point one striking thing. I CANNOT edit my /etc/mnttab file!! And I have never been able to do it. My server is an rp3410 runnning Feb 2007 11.31 O.S. Apparently that might be important. This is the output of ls -l /etc/mnttab

lrwxr-xr-x 1 root sys 11 Jan 5 16:38 /etc/mnttab -> /dev/mnttab

The file has a link to a device file. If I vi into this at the bottom of the editor I get character special file and I really think it is not edittable. Please tell me otherwise. And I have definitely not created that link. Looks like /etc/mnttab has progressed over the years and this is HPs way of not letting people mess with /etc/mnttab as syncer, mount and umount control the contents of this file. However, if you have any details on this, it would be nice sharing. :) It's actually good. But Dennis am I missing something here!. What O.S did you try a vi /etc/mnttab on?? Because this has always confused me because ppl keep saying never edit it and I know exactly why but it has never been edittable on my server! Eagerly awaiting your response.

> yaron

Please let us know if your filesystems are getting mounted and we have taken the right route because apparently your automounter was running and if it is you need another approach and the approach is to "just access" {if tha maps are set right}. :) And FYI this is a discussion based on YOUR question, can i edit /etc/mnttab! :)

Regards
Ismail Azad

Re: auto mount

Ismail Azad — Fri, 04 Feb 2011 12:39:19 GMT

Hi,

> Dennis

And yes, I have always seen a blank screen "attempting" to vi into /etc/mnttab.

Regards
Ismail Azad