Swap issue on a Solaris10 box

UNIX Solaris
1

One of our system is running 3 oracle db instances. And as per prstat o/p the system is approximately using 78G of swap memory

# prstat -J -n 2,15

PROJID    NPROC  SWAP   RSS MEMORY      TIME  CPU PROJECT
  4038      557   31G   29G    22% 113:23:43  10% proj1
  4036      466   20G   19G    15% 2359:46:4 7.6% proj2
  4023      452   25G   17G    13%  67:33:14 5.8%  proj3
       3       44  221M  226M   0.2% 105:55:41 1.0% default
     0      141  859M  543M   0.4% 801:01:21 0.3% system
     1       18  333M  329M   0.3%   6:41:31 0.0% user.root

but vmstat, swap -l shows approximately 115G free swap (see bold ) out of total 123G configured swap (zfs o/p)

swapfile             dev  swaplo blocks   free
/dev/zvol/dsk/rpool/swap 256,1      16 4194288 849952
/dev/zvol/dsk/swappool/swap1 256,3      16 251658224 


vmstat -S 1 3
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  si  so pi po fr de sr lf s0 s1 s2   in   sy   cs us sy id
 0 6 0 109555680 13515096 0 0 5119 16 21 0 8 0 0  0  0 26340 160046 36768 17 7 76
 0 1 0 120233928 25672592 0 0 3992 0 0 0 0  0  0  0  0 15273 78922 15473 17 3 80
 1 0 0 120220304 25661568 0 0 24 0 0  0  0  0  0  0  0 14509 66103 14879 19 2 79
 0 1 0 120215496 25656360 0 0 39 0 0  0  0  0  0  0  0 17999 76188 20237 20 3 77
 

rpool/swap                                     2.03G  76.6G  2.03G  -
swappool                                        120G  13.9G    18K  /swappool

why there is difference in figures of swap in o/p of prstat and vmstat& swap -l

2

try the df -h command

swap is also the /tmp directory. Any space used there is reported against swap by some utilities. By the way do not let /tmp get anywhere near full. You can get a kernel panic when /tmp completely fills up. And any file in the /tmp directory is lost on reboot.

3

Jim, you are correct .. but the problem here is reverse .. as the system is showing all swap free .. but as per prstat .. its should be using 70G of memory :stuck_out_tongue: