Version: HP-UX <hostname> B.11.31 U ia64 unlimited-user license
Physical Configured is 36 GB
CPU info:
4 Intel(R) Itanium 2 9000 series processors (1.6 GHz, 24 MB)
533 MT/s bus, CPU version C2
12 logical processors
Memory: 36813 MB (35.95 GB)
Swap Configured is :
Glance output:
==============
Code:
CPU Util S SAU U | 63% 63% 63%
Disk Util F F |100% 100% 100%
Mem Util S SU UF |100% 100% 100%
Swap Util U UR R | 64% 64% 64%
Am using SAP Application and Database, My question is ,
The swap usage remains used at 63% or 64% even though the Memory Utilization is 100% or 95% or 90%
Why the swap usage is not increasing in the system .
My understanding of swap usage is , when More Physical memory being used , automatically system should start using the swap configured in the system , in our case it is configured 61440 Mb , why the system is not utilizing the swap ?
it is always used at 63% or 64%
By the look of things, you have a swap logical volume defined twice the size of the RAM installed...
This would mean that you could load far more processes than what your real memory would allow ( since HPUX is a vitual memory system...).
My concern in your configuration is performance...
when More Physical memory being used , automatically system should start using the swap configured in the system , in our case it is configured 61440 Mb , why the system is not utilizing the swap ?
It will... if the system needs it...
I think what is not clear to you is how the Virtual System works:
In HPUX when you load a process, it will go to the VM first (that means swap device) to allocate the space needed, then loaded in memory - That space used is marked as RESERVED. Once all processes are running rather than waiste the unused memory it will be used as cache or SWAP (for it is far more faster the disk...). It is doing exactly that on your system: Your memory usage is almost maximum
: ) Thanks again For the Reply , Am an Application guy, But able to understand your reply ,
Now
For our system , at the present scenario, Whether to Configure more Physical Ram or swap usage ?
Now my question is
1. In the posted glance output , under what scenario the swap util Reaches 100% From the current value of 64%
2. Is the Following achievable
on the system what configurations has to be done , so that when usage of physical memory reaches 85% , at this point,
system should start using the swap configured , once this swap configured gets used 100% , than it should start consuming
the Remaining portion of the physical memory i e 15%
also unable to digest , how the swap used on HP UX
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...)
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)
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
I have an integrity machine rx7620 and rx8640 running hp-ux 11.31. I'm planning to fine tune the system:
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- And how much % of memory swap utilization should be specified (swap space device... (6 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.
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Hello and thanks in advance.
I have a Sun box with raid 1 on the O/S disks using solaris svm.
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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.
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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)
11-17-2011
