Default ports of ITM components

1) PORT 1920:

By default, a http port 1920 is allocated during starting of the first ITM component. This port is used to serve service console request as well as the TEPS and SOAP server request. if this port is not available, a random port is allocated and used for http request.

The owner of the base HTTP port 1920 will redirect the calls to the random http port allocated by the other ITM components. The same can happen to the HTTPS port 3661.

Note that the allocated random http port is bound to 1920, so the http request is served using a random port as well as 1920

The random http and https ports allocated by the ITM components can be identified from the RAS1 log of the ITM component

(4FEDD526.0015-32B4:kdhslqm.c,349,"add_listener") listening: ip.tcp.http:59029
(4FEDD526.0027-32B4:kdhslqm.c,349,"add_listener") listening: ip.ssl.https:59031
(4FEDD526.0013-32B4:kdhslqm.c,349,"add_listener") listening: ip6.tcp.http:59028
(4FEDD526.0021-32B4:kdhslqm.c,349,"add_listener") listening: ip6.ssl.https:59030

2) PORT 3661:

by default, a https port 3661 is allocated for secure http request during starting of the first ITM component. This port is used to serve service console request as well as the TEPS and SOAP server request. if this port is not available, a random port is allocated and used for https request.

3) PORT 4096:

A basic services port is allocated which is based on ITM port allocation algorithm
(well-known port + count * 4096)

where the well-known port is the port number assigned to the monitoring server . The default port number assigned to monitoring server is 1918.

Let's say, if the well-known port assigned to monitoring server is 1918, the first started monitoring agent gets 1918+4096=6014, if the port 6014 is busy then 1918 + 2 * 4096 = 10110 port will be allocated to the monitoring agent and so on.. if the port 6014 is RESERVED, then the agent won't start and fail

4)PORT 15001:

In addition TEPS uses 15001 for its own purpose.

NOTE : all the above ports can be controlled using POOL parameter and the explanation of POOL parameter is not the scope of this technote

5) PORT 9999:

By default, eclipse help server uses port 9999. This can be changed by reconfiguring the eclipse help server

6) Loopback Ports:

Also, whenever the ITM components including agent started, there are few outbound loopback ports allocated. Below is the some example for loopback ports:

127.0.0.1.1052
127.0.0.1.1053
127.0.0.1.1054

7) PORT 1978:

Default port 1978 is used by the remote deployment process

NOTE: The loopback and the default remote deployment ports cannot be directed to specific port range

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Where does my space gone in AIX/Linux filesystem ?

One of my friend got a situation where in she is seeing 9 GB allocated to one of the filesystems which is 100%utilized  but actual usage is 4GB  when verified with "du" command

#df -k  /mytest
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/mytestlv  9216 9216 100% 48804 12% /mytest 

She was wondering where does the other 5GB gone . 

Reason: 

This situation happens  when a  process is opening a file and dumping data into it and the file is removed while said process still has file open.So called process still holds that file space even file deleted.

How to Rectify ?

At first you need to check  what are all the  processes using  a particular filesystem using "fuser" command.

# fuser -c /mytest
/mytest:  2567 4006c 6548c 8657

You need to kill the above process if you want to free up the space.

Note: You need to inform the respective application owner/support team and take the application down time if this file-system is used by any-application.

How to Kill the proceses ?

# fuser -kc /mytest 

This  will kill  all the processes and  space will be freed up.

Check the space now 

#df -k  /mytest
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/mytestlv  9216 4096 45% 48804 12% /mytest 

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MS Word Secret Code

I think most of you all know about this but I wanna  remind again.

Do you want a Word document full of text without typing it all?

This is useful specially for print test purpose.

open Microsoft Word in RUN: type winword and press enter.

open a new Word document and type in

=rand(3,9)

then press''enter'

3 ==> number of paragraphs
9 ==>  number of sentences for paragraph.

Its your choice  to choose the number of paragraphs and sentences.

After Enter  you would see this 

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Not enough free space to shrink the file system issue in AIX

Recently got an issue in reducing jfs2 filesystem  with osverion 6.1 and have enough space to reduce filesystem.

root@umaix /tmp>df -g /orafs1
Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on
/dev/oralv1   100.00    75.00   25%      555     1%  /orafs1

root@umaix /tmp>chfs -a size=-15G /orafs1
chfs: There is not enough free space to shrink the file system.

This issue will occur whenever you try to reduce big chunk of data ( in this case 15GB) that may not be contiguous in the file-system because you have files scatted everywhere.

Try   the following methods one by one until your issue fixed

1. Try to defrag the FS:

#defragfs -s /orafs1

2. Reduce in smaller chunks:

If you still can't reduce it after this. Try reducing the filesystem  in smaller chunks. Instead of 15G at a time, try reducing 1 or 2 gigs. Then, repeat the operation.

3. Check the processes:

Sometimes processes open big files and use lots of temporary space in those filesystem.
You could check processes/applications running against the filesystem and stop them temporarily, if you can.

#fuser -cu[x] <filsystem>

4. Move the large files and try shrink

Try looking for files large using the find cmd and move them out temporarily, just to see if we can shrink the fs without them:

#find /<filesystem> -xdev -size +2048 -ls|sort -r +10|pg

Finally the last method, the alternative approach if any one of above methods are not working then go for filesystem recreation.

==> You should be very care full , need to take fs backup and as well as approach application before removing the filelsystem.

5) Recreate filesystem:

• - Take databackup of the fielsystem  ( very Important,dont skip this )
  Either you can take using your backup tools like TSM / netbackup or move data to a temporary   directory


• - Remove the  filesystem  (  #rmfs /orafs)
• - Create the filesystem again
   #mklv -y oralv1 -t jfs2 oravg 600  ( in this case we need 75GB and pp size is 128)
   #crfs -v jfs2 -d oralv1 -m /orafs1 -A yes  (create orafs1 filesystem)


• - Restore data to the filesystem
• - Verify fs size

root@umaix /tmp>df -g /orafs1
Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on
/dev/oralv1   75.00    50.00   33%      555     1%  /orafs1

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How to mirror VIOS Boot Disk?

Here is the procedure to mirror VIOs boot disk.

# lspv
NAME             PVID                 VG               STATUS
hdisk0           00c122d4341c6e62     rootvg           active
hdisk1           00cd55a4fg6b676f     None
hdisk2           00c5524409a99b77     None

Here hdisk0 is rootvg disk , now we need to check free disk.
you can use lspv -free command to check the un-mapped free disks.

$ lspv -free
NAME            PVID                                SIZE(megabytes)
hdisk1         00cd55a4fg6b676f                     256000
hdisk2         00c5524409a99b77                     256000

So In this case, hdisk1 is free and un-mapped . So we're going to use hdisk1 to mirror with hdisk0.

Add hdisk1 into rootvg:

# extendvg rootvg hdisk1 0516-1254 extendvg: Changing the PVID in the ODM.

Now mirror the disk but defer the automatic reboot:

$ mirrorios -defer hdisk1

Now check the boot list:

$ bootlist -mode normal -ls
hdisk0 blv=hd5 pathid=0

We only have hdisk0 at the moment.  Need to add hdisk1 into this:

$ bootlist -mode normal hdisk0 hdisk1

Check that worked:

$ bootlist -mode normal -ls
hdisk0 blv=hd5 pathid=0
hdisk1 blv=hd5 pathid=0

You now have a mirrored rootvg. 

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