swap/vmstat

[M.Thomas]

Please find this swap and vmstat info. i put the lvswap3 yesterday. it shows 93%. what does that mean? cant it use the other swap also? sr on vmstat is showing up also

# swapinfo -atm
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol2
dev 8192 0 8192 0% 0 - 1 /dev/vg00/lvswap1
dev 8192 4760 3432 58% 0 - 0 /dev/vg00/lvswap2
dev 5120 4747 373 93% 0 - 0 /dev/vg00/lvswap3
reserve - 15599 -15599
memory 19222 7073 12149 37%
total 44822 32179 12643 72% - 0 -
# vmstat 2 20
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
4 3 0 3537879 24591 48 10 11 17 1 0 452 10142 37684 4892 23 4 73
4 3 0 3537879 24535 53 8 7 0 0 0 0 3425 30090 4097 51 3 46
4 3 0 3537879 24535 34 4 5 0 0 0 0 3286 29234 3901 45 2 54
4 3 0 3537879 24457 22 2 16 0 0 0 0 3233 28130 3822 35 1 64
3 1 0 3567016 24457 15 0 10 0 0 0 0 3013 23097 3079 27 2 71
3 1 0 3567016 24457 72 12 8 0 0 0 0 2690 20586 2619 37 1 61
3 1 0 3567016 24457 46 7 5 0 0 0 0 2571 18088 2396 50 3 47
3 1 0 3567016 23208 29 4 271 51 0 0 6 2555 17981 2556 54 4 42
3 1 0 3567016 23817 19 2 208 150 0 0 169 2534 19020 2768 56 2 41
6 1 0 3841907 23785 12 0 135 96 0 0 108 2494 19263 2749 60 6 34
6 1 0 3841907 24105 70 12 88 112 0 0 119 2310 22146 2894 61 1 38
6 1 0 3841907 23871 45 7 94 71 0 0 76 2317 21807 2775 68 3 29
6 1 0 3841907 23858 28 4 63 44 0 0 48 2398 21711 2795 61 5 34
6 1 0 3841907 23858 18 2 40 28 0 0 30 2457 19166 2547 60 1 39
5 1 0 3960655 23855 12 0 26 17 0 0 19 2513 18758 2541 51 4 45
5 1 0 3960655 23867 70 12 18 12 0 0 12 2427 17714 2286 55 2 42
5 1 0 3960655 23867 45 7 12 7 0 0 7 2302 12094 1633 41 0 59
5 1 0 3960655 23867 36 5 10 5 0 0 5 2316 10208 1469 41 1 58
5 1 0 3960655 23866 22 3 7 3 0 0 3 2264 8155 1306 39 1 60
4 1 0 3707361 23866 15 1 4 1 0 0 1 2237 7287 1205 39 2 59
#

[James R. Ferguson]

Hi:

The utilization of lvswap2 and lvswap3 is due to the numerically lower value for their priority than that for either the primary swap or 'lvswap1'. A lower value for swap priority means a preference for that space. See the manpages for 'swapon(1M)' for more information.

Your page-outs ('po') indicate memory pressure. Values higher than single digits are significant.

Regards!

...JRF...

[Jaime Bolanos Rojas.]

M.Thomas,

According to your po value in vmstat looks like you are paging out already ( not a good thing ).

According to the total line you have reserved 72% of you total swap, ( high value already).

Setting the priority of lvswap3 and lvswap3 to 1 is not really going to help much with your memory presure, since you are already using 72%.

The real solution here is to buy more memory ( memory is cheap, not for me but is cheap ).

Remember once you reach your 100% reserved space in the total line your system is not going to work anymore and is going to go out of wack.

My best advice, buy some memory.

Regards,

Jaime.