swap utilisation problem

[aneez]

Hi all,


i have some problem in the swap utilisation output. please find the below output

# swapinfo -mt
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 5000 0 5000 0% 0 - 1 /dev/vg00/lvol10
dev 3000 0 3000 0% 0 - 1 /dev/vg00/lvswap
reserve - 12034 -12034
total 12096 12034 62 99% - 0

in this its showing the total utilisation is 99% but the percentage used in dev swaps are 0. why its taking like this.


thanks
Aneez

[Dennis Handly]

You have reserved the space but haven't used it yet.
You will have to add more swap if you want to run more applications.

You also should configure the kernel parm swapmem_on so you can use pseudo-swap.

[Asif Sharif]

Hi Aneez,

http://docs.google.com/View?docid=dc7s6mzr_56cgsg9g

Technical knowledge base - document
http://www12.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01161061-2

Full document is available at ftp://eh:spear9@hprc.external.hp.com/memory.htm

Regards,
Asif Sharif

[Rasheed Tamton]

Hi,
The above doc explains well about swap. You seems to have memory issues. As said above, you are not using pseudoswap.

You have 16GB memory and what is the OS version.

Just give the output of
kctune|grep dbc
and
glance -m footer

Regards.

[Avinash20]

Pseudo-swap is either free or pseudo-allocated , it is never reserved.

If there is an insufficient amount of available memory to fork you will receive an error : cannot fork, not enough virtual memory.

If this error is received , you will need to allocate more device swap. This should be configured on a disk with no other swap partitions, and ideally of the same size and priority of existing swap logical volumes to enable interleaving.

[aneez]

hi all

here my physical memmory is 10GB and i assigned only 12GB as swap. may this cause the problem
so i am planning to add more swap and let u know the results.

we r not using pseudo-swap.

thanks for the replies

[Dennis Handly]

we're not using pseudo-swap.

This is your problem. You should use it.
You still may need more device swap.