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I have never used CentOS so I don't know off the top of my head, but is /tmp mounted on tmpfs or on a separate partition (check with the "mount" command).
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 407 3068415 82 Linux swap / Solaris
/dev/sda3 408 60801 485114805 83 Linux
[root@server ~]# mount
/dev/sda3 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
Well, according to that /tmp is just a normal directory in your root filesystem, so there should be no inherent size limitation besides the size of the partition / is mounted on.
Adding to what MS3FGX said: If you want to increase the amount of space available to /tmp either make the / partition bigger or mount /tmp on its own large, empty partition.
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