topic Re: /tmp size. in Operating System - HP-UX

/tmp size.

David Blair_2 — Fri, 21 Jun 2002 12:26:47 GMT

Hello..

I am new to HP-UX and I hope someone will answer this query?

What is the default filesystem for the /tmp directory on HP-UX. Is it /var ?

Are there any recommendations for the filesystem sizing for /tmp ?

Can temp files be handled differnently (other tha setti g TMPDIR) ?

Regards..

Re: /tmp size.

Ian Dennison_1 — Fri, 21 Jun 2002 12:28:55 GMT

The default system for /tmp is /tmp. /var/tmp (under the var mount point) is used for temporary working files, whereas /tmp is used for other types of files (/tmp is used when compressing files or reading large vi files, as a working area).

Share and Enjoy! Ian

Re: /tmp size.

David Blair_2 — Fri, 21 Jun 2002 12:32:15 GMT

Sorry,,

Is /tmp a seperate filesystem or is it a on root/. ?

Re: /tmp size.

Peter Kloetgen — Fri, 21 Jun 2002 12:32:39 GMT

Hi David,

the default on HP-UX is /tmp. On my installations i allways change the size to 300 MB (chose: fixed size). The default installation normally gives a size of 64 MB.

Allways stay on the bright side of life!

Peter

Re: /tmp size.

Peter Kloetgen — Fri, 21 Jun 2002 12:33:55 GMT

Ups, hi again David,

/tmp is a seperate filesystem. You can confirm this in /etc/fstab file.

Allways stay on the bright side of life!

Peter

Re: /tmp size.

PIYUSH D. PATEL — Fri, 21 Jun 2002 12:34:09 GMT

Hi,

/tmp is the default /tmp filesystem in HPUX. The size of the /tmp can be decided by you and I feel it should be around 500MB. /var/tmp is also used by some applications.

If you have installed the HPUX with the option of Volatile filesytems then /tmp will be a seperate filesystem, or else it will be under / (root).

Piyush

Re: /tmp size.

Thierry Poels_1 — Fri, 21 Jun 2002 12:35:01 GMT

OK, about the size then ....
this really depends on your needs: we've got servers with a /tmp of just 20MB and others with a /tmp of 1GB!
Generally 100-200MB will be fine.

regards,
Thierry.

Re: /tmp size.

James R. Ferguson — Fri, 21 Jun 2002 12:36:33 GMT

Hi David:

'/tmp' would be the default based on the rules defined by 'mktemp' (see the man pages).

For some utilities, like 'sort', /var/tmp is used preferentially over '/tmp' (see the man pages, again).

SD utilities also use /var/tmp.

Regards!

...JRF...

Re: /tmp size.

David Blair_2 — Fri, 21 Jun 2002 12:43:15 GMT

What can I say - what a response.

I am a used other Unix forums a lot and I am very inpressed with the reponse..

I'll be back..

Cheers.

Re: /tmp size.

Tim D Fulford — Fri, 21 Jun 2002 12:43:20 GMT

default LOGICAL VOLUME (LV) containing the /tmp filesystem is /dev/vg00/lvol5

/var is another LV /dev/vg00/lvol8

/var/tmp is generally a less well know temp dir, vi uses it for instance.

/tmp will need to be as big as you need. 20MB to as musch as is required (we have 512MB)

I know of no system variable that alters tempdir, it is usually set from within the APP (e.g. Informix use DBSPACETEMP)

Tim

Re: /tmp size.

Shahul — Fri, 21 Jun 2002 12:55:10 GMT

Hi

/tmp is the default temporary filesystem for HP. It's size will change from system to system. U can create as per requirement. It can be seperate file system or it can be a directory under root. In that case Ur root file system should have enough space. In a big setup it is suggested to create as another filesystem.

Best of luck
Shahul

Re: /tmp size.

Pete Randall — Fri, 21 Jun 2002 12:58:32 GMT

Geez no - don't put it under root - keep it a separate filesystem so some runaway process writing garbage to /tmp doesn't end up filling your root file system. We tend to use 64 Mb for /tmp but that's just us.

Pete

Re: /tmp size.

Sanjay_6 — Fri, 21 Jun 2002 12:59:05 GMT

Hi David,

If you aeere talking about the default logical volume for /tmp. it should be /dev/vg00/lvol6. The size of this filesystem depends on the type of configuration you have and the size of the root disk on your system.

The temporary files are store either in /tmp or /var/tmp on your system. I don't think there is any variable other than TMPDIR that can help you manage your tmp files.

Hope this helps.

Regds

Re: /tmp size.

Martin Johnson — Fri, 21 Jun 2002 13:05:03 GMT

Given the choice of having /tmp part of root or its own file system, I would recommend it being in its own file system. / is static and difficult to expand. /tmp is dynamic, usage is dependent upon appplication use.

It is also my personal choice to make /var/tmp its own file system too.

HTH
Marty

Re: /tmp size.

Nick Wickens — Fri, 21 Jun 2002 14:13:13 GMT

Hi David

Dependant upon your site its a good idea to keep an eye on what is being written in /tmp as not all programmers will be good enough to remove tmp files upon program completion.

Ideally anything older than a few days in /tmp should be removed but check what is left in there first before you first start deleting. Once you are happy that your apps are not writing anything you wish to keep (get the programs amended if they are) add the following line into cron to clear anything older than 2 days in /tmp.

find /tmp -type f -mtime +2 -exec rm {} \; 2>/dev/null

Re: /tmp size.

Tim D Fulford — Sat, 22 Jun 2002 04:03:55 GMT

Hi david as you are new to ITRC take a look at this site

http://66.216.15.50/ITRCForumsEtiquette/

(0pts please)
Tim

Re: /tmp size.

Bill Hassell — Sun, 23 Jun 2002 01:18:59 GMT

Actually, /tmp is defined as system-use only and /var/tmp is defined as user temp space. This is part of the V.4 filesystem definitions which most modern Unices follow. This is why /tmp is so small in HP-UX. It is recommeded to set:

export TEMP=/var/tmp
export TMPDIR=/var/tmp

Look at the white paper: file_sys in /usr/share/doc for more details.

It should also be noted that /var represents several large scale subsystems (email, spooling, logging, patches/software, crash dumps), any of which can fill /var and bring the system to it's knees. It is recommended that separately mounted filesystems be created within /var to keep these filesystems separate (based on system usage).