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 login prompt. Oracle is completely down. Only Base OS is running.
TOPAS does not show anything unusual (from what I can determine).
Not sure which tunable controls the pty/pts lines (maybe not in right direction, not sure).
Tuanble and other output attached. It has been running as a Oracle Server but something changed 2 weeks ago, and no one wants to admit it.
Off of the top of my head....
This sounds like a DNS problem.
Check your nslookup and ping times for IP address, short and FQDN - bot ways.
DON'T forget to clear your arp cache before each test.
Could be a hosts file problem if you are not using DNS.
This sort of problem is almost always because the host cannot properly resolve the incoming connection...
HTH
Dear
1 - you need to set the network seepd to 1000 FullDuplex manually , then you need to check the network speed from switch side that to be 1000 FullDuplex
A misleading load of rubbish about network speed settings.
You set your Network Interface Card speed to match the speed of the switch - agree it with the network administrator and get them to force the switch port too. You may have to delete and rediscover the card to be able to do it, so it's not a trivial task and it is unrelated to this issue in my expectation.
I have had this very problem, and on AIX too. DNS is the most likely issue. If you have multiple DNS servers defined, then you would think that if the first one listed in /etc/resolv.conf does not respond that you will move on to the next. Whilst this is true, the default is to try again a few times and the timeout is a few seconds. By default, this adds up to 75 seconds.
We changed our /etc/environment to add the following two records:-
Code:
RES_RETRY=2
RES_TIMEOUT=2
That brings to timeout down to 4 seconds.
Give that a try and see if it helps. You may also want to check your DNS servers are all responding properly. For each defined server, use a series of nslookups with the DNS server's IP address appended to force it. That may illustrate something else too.
@Robin:
If this was an explanation to my question to cobra, thanks. But I wondered how heŽd seemed to know what the reason is.
Having fix speeds instead of auto often helps, but iirc, then you have usually error counter increasing on that interface and I canŽt see any here.
IŽd also take name resolution problems as 1st option to check for.
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)
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)
Greetings,
i'm wondering if there is a way to determine minimum memory requirement for AIX kernel and OS functions? We use memdetails script from perfpmr package to see actual memory allocation, for example like this:
===========================================================================... (5 Replies)
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
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Hi all,
From Googling, I found that the basics used for troubleshooting UNIX/AIX performance issues are commands like vmstat, iostat and sar. I believe these are generic commands regardless of what UNIX flavour is in used, only difference being is the format of the output.
In a real case... (2 Replies)
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)
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)
HI All,
Does anyone out there know of any good online tutorials for the basics of routing, gateways, networking with AIX, preferably the more recent versions like 5.2/5.3?
Using commands such as netstat, smit mkroute, etc. to connect to boxes on a network, and load software with networked... (1 Reply)
