Hi zxmaus and thanks in advance for your help.

oslevel -r : 5300-03

- Memory
Physical memory : 16 Mb
Paging space : only 5 Mb

- Processor :
Processor Type: PowerPC_POWER5
Number Of Processors: 4
Processor Clock Speed: 1896 MHz

Command : vmo -a
cpu_scale_memp = 8 ; data_stagger_interval = 161 ; defps = 1
force_relalias_lite = 0 ;framesets = 2; htabscale = n/a
kernel_heap_psize = 4096 ; large_page_heap_size = 0 ; lgpg_regions = 0
lgpg_size = 0 ; low_ps_handling = 1 ; lru_file_repage = 1
lru_poll_interval = 10 ; lrubucket = 131072 ; maxclient% = 80
maxfree = 1088 ; maxperm = 3096895 ; maxperm% = 80
maxpin = 3304704 ; maxpin% = 80 ; mbuf_heap_psize = 4096
memory_affinity = 1 ; memory_frames = 4079616 ; memplace_data = 2
memplace_mapped_file = 2 ; memplace_shm_anonymous = 2
memplace_shm_named = 2 ; memplace_stack = 2 ; memplace_text = 2
memplace_unmapped_file = 2 ; mempools = 0 ; minfree = 960
minperm = 774223 ; minperm% = 20 ; nokilluid = 0
npskill = 10112 ; npsrpgmax = 80896 ;npsrpgmin = 60672
npsscrubmax = 80896 ; npsscrubmin = 60672 ; npswarn = 40448
num_spec_dataseg = 0 ; numpsblks = 1294336 ; page_steal_method = 0
pagecoloring = n/a ; pinnable_frames = 3319403 ;
pta_balance_threshold = n/a ; relalias_percentage = 0 ;rpgclean = 0
rpgcontrol = 2 ; scrub = 0 ;scrubclean = 0 ; soft_min_lgpgs_vmpool = 0
spec_dataseg_int = 512 ; strict_maxclient = 1 ; strict_maxperm = 0
v_pinshm = 0 ; vm_modlist_threshold = -1 ; vmm_fork_policy = 1

Command : vmstat -v
4079616 memory pages
3871119 lruable pages
21738 free pages
0 memory pools
760743 pinned pages
80.0 maxpin percentage
20.0 minperm percentage
80.0 maxperm percentage
72.5 numperm percentage
2809328 file pages
0.0 compressed percentage
0 compressed pages
72.7 numclient percentage
80.0 maxclient percentage
2817268 client pages
0 remote pageouts scheduled
4018 pending disk I/Os blocked with no pbuf
48890 paging space I/Os blocked with no psbuf
2740 filesystem I/Os blocked with no fsbuf
110 client filesystem I/Os blocked with no fsbuf
89345 external pager filesystem I/Os blocked with no fsbuf

Command : vmstat -I 5 5
kthr memory page faults cpu
-------- ----------- ------------------------ ------------ -----------
r b p avm fre fi fo pi po fr sr in sy cs us sy id wa
1 1 0 1837530 20768 41 196 8 0 0 0 1110 29968 10573 17 10 70 3
1 1 0 1833453 24285 75 213 11 0 0 0 1043 32556 13921 16 14 62 7
1 1 0 1827655 28258 22 74 85 0 0 0 740 57171 6965 21 5 68 6
2 1 0 1832959 21916 60 151 99 0 0 0 434 46722 7054 31 11 47 11
1 1 0 1832622 20253 96 230 88 0 0 0 1351 32595 11736 19 10 63 8