100% Swap usage

[jaivinder]

Hi Gurus,

One of my HP rx 4640 server running HP UX 11i V2 is showing 100% swap usage.The swapinfo result is as below:
# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 32752 0 32752 0% 0 - 1 /dev/vg00/pswap
reserve - 32308 -32308
total 32752 32308 444 99% - 0 -

Here the reserved swap is 99 % utilized. Please advice.

[Jeeshan]

what is your dbc_max_pct and dbc_min_pct parameter values?

[Asif Sharif]

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=21504

[Jeeshan]

i guess you need to change the kernel parameter to enable pseudo swap.

kernel parameter
swapmem_on 1

otherwise you need to change the dbc_max_pct and dbc_min_pct kernel parameters.

[Rasheed Tamton]

Hi Jaivinder,

You are not using pseudoswap and enabling would help as Ahsan said. But please post:
kctune|grep dbc
(that would give the parameters related to your buffer)

Minimizing the dbc_max_pct to 5 would free some memory from the buffer cache.
The command is (if it is 11iV2)
kctune dbc_max_pct=5

The older version required reboot for changing the value. So make sure the kernel parameter is dynamic.

[Rasheed Tamton]

dbc_max_pct is dynamic on 11iV2.