vmstat -v shows that about 20% of memory pages are pinned (that would roughly correspond to those 13 GB for kernel). Does it mean that application doesn't use memory pinning (server is running Oracle+SAP)? svmon tells me that oracle and workprocesses use about 33 MB of pinned memory, perhaps it's the way they are designed. I'll have to check on some testing system what happens, if you continually increase memory for aplication, how it will affect OS behaviour.
Hello,
I'm using a unix server (HP rp2450) which has : 2 Go RAM memory and 4 Go swap.
Here is the result of vmstat -n command :
$ vmstat -n
VM
memory page faults
avm free re at pi po fr de sr in sy ... (5 Replies)
This is post number 3 in a series of unanswered "TUNING" questions. :D
With AIX 5.3 TL4, the page size can vary from the original "4k". They can now be "64k" and a couple other sizes. They also do not have to all be the same. Some can remain "4k" while others are "64k" which is what seems to... (2 Replies)
Hi
I am trying to investigate a disk performance issue, and we are not seem to be hitting the right direction in our analysis.
This is a FC disk running on USP1000 HDS system. The application is an IO intensive application, but our opinion is that it is not performing due to perceived disk... (1 Reply)
Dear friends. can anybody suggest me what to be considered in order to achieve maximum performance of AIX on which DB2 will be installed
Thanks is advance :) (1 Reply)
Dears i want to have a clear view about this tuning parameters and what they related to FS or Oracle , and how to figure the percentage of them .
maxperm%
maxclient%
v_pinshm = 1
lgpg_regions = 0
lpgp_size = 0 (3 Replies)
For some reason, my AIX 5.2 box has become slow in accepting telnet requests from others boxes. Windows, times out the connection, whereas, Unix it will wait for the AIX to display the login. I connect and it respawns back and says connected, but then sits and wait for what seems forever to get the... (5 Replies)
Hi,
we've a gigabit Ethernet adapter. And we wanted to improve the performance by tuning network parameters. so' as per IBM info center,
http://publib.boulder.ibm.com/infocenter/aix/v7r1/index.jsp?topic=%2Fcom.ibm.aix.prftungd%2Fdoc%2Fprftungd%2Fnetw_opt.htm
we tried changing the tuning... (2 Replies)
I have a IBM Power9 server coupled with a NVMe StorWize V7000 GEN3 storage, doing some benchmarks and noticing that single thread I/O (80% Read / 20% Write, common OLTP I/O profile) seems slow.
./xdisk -R0 -r80 -b 8k -M 1 -f /usr1/testing -t60 -OD -V
BS Proc AIO read% IO Flag IO/s ... (8 Replies)
Discussion started by: c3rb3rus
8 Replies
LEARN ABOUT HPUX
acctsuspend
acctsuspend(5) File Formats Manual acctsuspend(5)NAME
acctsuspend, acctresume - suspend and resume accounting when available disk space reaches threshold
VALUES
Failsafe
Default.
Default
acctsuspend:
acctresume:
Allowed values
acctresume:
acctsuspend:
Recommended values
acctsuspend:
acctresume: (But more than acctsuspend)
DESCRIPTION
The and tunables control when accounting stops and resumes due to disk space constraints. When free disk space on the file system being
used by accounting reaches the suspension threshold, which is the percentage relative to the percentage of disk space available only to the
superuser, accounting is suspended until such time as the free disk space reaches the resumption threshold, which is the percentage rela-
tive to the percentage of disk space available only to the superuser.
Note: Since the and values are specified relative to the percentage of disk space available only to the superuser, negative values
of these parameters can make sense. For example, if the superuser has reserved 10 percent of the disk space on the file system at
file system creation time, and acctsuspend is -5 and acctresume is 0, the suspension threshold will be 5 percent of the total disk
space and the resumption threshold will be 10 percent of the total disk space.
Who Is Expected to Change This Tunable?
Anyone using accounting.
Restrictions on Changing
Changes to this tunable take effect at the next reboot.
When Should the Value of This Tunable Be Raised?
Increasing either variable should be considered when it is necessary to maintain a higher percentage of free space on the accounting
filesystem.
What Are the Side Effects of Raising the Value of This Tunable?
The higher either value is, the less accounting data may be captured. The further the values are separated, the greater the amount of
potentially lost accounting data.
When Should the Value of This Tunable Be Lowered?
If additional disk space is needed for accounting data, and it cannot be obtained by moving files off of the filesystem, then the value of
should be lowered.
What Are the Side Effects of Lowering the Value of This Tunable?
Filesystem performance (writing accounting records) decreases as the filesystem fills up. In turn, this will decrease the overall perfor-
mance of accounting processes.
What Other Tunables Should Be Changed at the Same Time?
When changing either of these tunables, both should be considered.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of
HP-UX.
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
and were developed by HP.
SEE ALSO accton(1M).
Tunable Kernel Parameters acctsuspend(5)