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How to use space in /tmp to increase root?

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Operating Systems Solaris How to use space in /tmp to increase root?
# 1  
Old 08-02-2016
How to use space in /tmp to increase root?

Hello All,

I have solaris server running,
uname -a
SunOS host 5.9 Generic_112233-12 sun4u sparc SUNW,Sun-Fire-280R

Filesystem             Size   Used  Available Capacity  Mounted on
/dev/md/dsk/d0         9.8G   8.7G       1.0G    90%    /
/dev/dsk/c1t1d0s3      4.3G   7.7M       4.2G     1%    /tmp

I want to increase my root by 2GB more by consuming the space in /tmp

How can i do that? can anyone help . Also kindly help me with the commands.Thanks.
# 2  
Old 08-02-2016
You can't, as the two file systems are on different disks. Even if they were on the same disk, it would be a risky task that should be reserved to experienced people.

What you can do, though, is redesign the file system tree by e.g. moving a large "branch" to the second disk, freeing its space on disk 1, create a tmp directory within that "branch", and then link /tmp thereto. You'll have to modify /etc/fstab accordingly, and make pretty sure that during boot the FS is available before any of its files are needed.
# 3  
Old 08-02-2016
I would actually ask the reverse question:-
"What is filling up my root filesystem?"
You might help to answer this reviewing the output from the following:-
cd /
du -ks *|sort -n

You can then work down the largest directories to get a feel for where the space is used. Perhaps you can move these.

Are you using a volume manager at all on this server (Veritas perhaps?) You would be far better to try to split up and shrink the root filesystem to hold just the OS that you need to boot. Data in the root filesystem, whatever directory path you squirrel it away under, is usually bad as if your application runs away, you can end up with a system that will not boot.

I would suggest that splitting out /var (where most OS logs are written to, along with mail files etc.) /home (user personal files) and /tmp would be good practice.

Can you tell us more about the server disk you have?

Output from df -h and a listing from the volume manager of all the volume groups would be useful. That might be a vgdisplay -v or vxdg list & vxdg free

That said, splitting a root filesystem is not a trivial matter. You will probably have to boot to single-user from media so that it is not in use, then move data around before attempting a shrink if your volume manager allows it.

How critical is the server and it's data? It would be prudent to check you can read your backups before starting anything.


Last edited by rbatte1; 08-02-2016 at 05:21 AM.. Reason: Added the section about using DU to find the directories using most space
# 4  
Old 08-02-2016
Originally Posted by RudiC
You can't, as the two file systems are on different disks.
While I agree expanding the file system would be a risky and unrecommended task for unexperienced people, there is actually no evidence / and /tmp are on different disks, more precisely, we do not know from which underlying devices the metadevice used by the root file system is made of but it is probably a mirror with one of its component on the same disk as /tmp. However, the standard layout is locating /tmp immediately before / while for growfs to be possible, it should have been located immediately after /. The bottom line is you probably can't expand / with /tmp but it might be possible to grow / by cannibalizing another file system like /export/home.
# 5  
Old 08-02-2016
Thanks for all the help.I asked the team to provision a 20 GB new LUN to the server.Can we expand the / by using the new LUN?
# 6  
Old 08-03-2016
No. The root file system can only be expanded using contiguous space from the same disk.
# 7  
Old 08-03-2016

it seems that ncdu is available too for SunOS. A good menu-driven program for checking used space on your system.

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