On your system I presume the kernel parameter swapmem_on is set to 1 (default value for 11.31) this means that the system can (and will ...) use up to 70% of your physical memory "AS" swap... after using all the physical memory as swap it will continue on de swap device...
In your case I find it frightening to see 19% of this time true swap used (meaning 12 GB contiguous disk space accessed...) has your system not slowed down?
compare to theses figures:
Code:
ran:/home/vbe $ swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 2048 0 2048 0% 0 - 1 /dev/vg00/lvol2
dev 2060 0 2060 0% 0 - 1 /dev/esvg01/lvol2
dev 2048 0 2048 0% 0 - 1 /dev/esvg02/lvol2
reserve - 1071 -1071
memory 5329 1560 3769 29%
total 11485 2631 8854 23% - 0 -
Disk access / used = 0!
Noticed how I "balanced the load if ever it has to use the swap? ( It will write to the three in parallel multiplying the throughput...)
When i re-updated my system i set my swap at 500 MB. I have 256 in ram and have never even gone into the 250 mb of swap that i had originally configured. How do I reduce the swap? (3 Replies)
Hi,
I am a SAP Basis admin recentely been asked to administer a HPUX server. Could someone recommend some good study material to learn with the Sap
prespective.
-carry (1 Reply)
Hello and thanks in advance.
I have a Sun box with raid 1 on the O/S disks using solaris svm.
I want to unmirror my swap partition, and add the slice on the second disk as an additional swap device. This would give me twice as much swap space.
I have been warned not to do this by some... (3 Replies)
I am running HPUX and using WLM (workload manager). I want to write a script to fork CPUs to basically take CPUs from other servers to show that the communication is working and CPU licensing is working. Basically, I want to build a script that will use up CPU on a server. Any ideas? (2 Replies)
free -m : 1023 total swap space
created default partition /dev/sdb1 50M using fdisk. i did write the changes.
#mkswap /dev/sdb1
#swapon /dev/sdb1
free -m : 1078 total swap space
this shows that the swap is on
Question : i did not change the type LINUX SWAP (82) in fdisk.
so why is... (5 Replies)
Hi
I have an integrity machine rx7620 and rx8640 running hp-ux 11.31. I'm planning to fine tune the system:
- I would like to know when does the memory swap space spill over to the device swap space?
- And how much % of memory swap utilization should be specified (swap space device... (6 Replies)
I'm sharing this in case anybody needs it. Modified from the original solaris pwage script. This modified hpux script will check /etc/password file on hpux trusted systems search /tcb and grep the required u_succhg field. Calculate days to expiry and notify users via email.
original solaris... (2 Replies)
Hi Solaris Folks :),
I need to calculate the swap usage on solaris server, please let me understand the output of below swap -s and swap -l commands.
$swap -s
total: 1774912k bytes allocated + 240616k reserved = 2015528k used, 14542512k available
$swap -l
swapfile dev swaplo... (6 Replies)
Discussion started by: seenuvasan1985
6 Replies
LEARN ABOUT HPUX
swapmem_on
swapmem_on(5) OBSOLETE swapmem_on(5)NAME
swapmem_on - OBSOLETE kernel tunable parameter
DESCRIPTION
The tunable is obsolete. Processes will always be allowed to use pseudo-swap space if it is available.
In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on
the system. This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be
killed due to insufficient swap.
This was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where
the entire load would always be in core. This tunable was created to allow system swap space to be less than core memory. To accomplish
this, a portion of physical memory is set aside as "pseudo-swap" space. While actual swap space is still available, processes still
reserve all the swap they will need at fork or execute time from the physical device or file system swap. Once this swap is completely
used, new processes do not reserve swap, and each page which would have been swapped to the physical device or file system is instead
locked in memory and counted as part of the pseudo-swap space.
WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by HP.
Tunable Kernel Parameters swapmem_on(5)