IBM-AIX: 2016

Thursday, December 22, 2016

How to solve current boot logical volume /dev/hd5, does not exist on /dev/hdisk# in aix?

Many cases we could receive this issue when we run mksysb command or run alt_disk copy or create/recreate the bosboot image on the disk.

Please follow the below procedure to fix the issue.

#cd /usr/bin

#cp mkszfile mkszfile.old

#vi mkszfile

search for the argument "-qv" and find the following line

BOOT_BLKS=`LC_MESSAGES=C ${bosboot} -qv | ${tail} -1l | ${awk} '{print $2 * 2}'`

Add the -d /dev/ipldevice. The line should look like this when finished

BOOT_BLKS=`LC_MESSAGES=C ${bosboot} -qvd /dev/ipldevice| ${tail} -1l | ${awk} '{print $2 * 2}'`

then save it and run mksysb or alt_disk again.

change mkszfile to use #bosboot -qvd /dev/ipldevice

****************************************************************************************************************************************

Another blv error

==============

If /dev/ipldevice vary with the boot disk, need to follow the below steps to correct it. We will do the first step for sure and it will end up with error as below, proceed with the next steps.

bosboot -ad /dev/ipldevice
0516-602 lslv: Logical volume name not entered.
0301-168 bosboot: The current boot logical volume, /dev/hd5, does not exist on /dev/hdisk0.

Solution:
lsvg -p rootvg - hdisk0
lslv -m hd5 --> hdisk0 on PV1 1st partition
savebase -v - successful

will remove/recreate hd5 – no need to worry it worked good

# rmlv hd5
# mklv -y hd5 -t boot -a e rootvg 1 hdisk0
# cd /dev
# rm ipldevice
# ln /dev/rhdisk0 /dev/ipldevice
# bosboot -ad /dev/ipldevice - same error

# bootinfo -B hdisk0 - 1
# ln /dev/rhd5 /dev/ipl_blv
# cd /dev - same maj/min numbers
# bosboot -ad /dev/ipldevice

Now we got the same minor and major number for hdisk0

# ls -ld /dev/ipldevice
crw------- 2 root system 20, 0 Oct 31 2019 ipldevice
# ls -ld /dev | grep -i "20, 0"
# ls -l /dev | grep "20, 0"
brw------- 1 root system 20, 0 Mar 31 08:54 hdisk0
crw------- 2 root system 20, 0 Oct 31 2019 ipldevice
crw------- 2 root system 20, 0 Oct 31 2019 rhdisk0
#
alt_disk_install was able to proceed now

****************************************************************************************************************************

Another blv error

=============

0301-162 bosboot: savebase failed with /dev/hdisk0.

0301-165 bosboot: WARNING! bosboot failed - do not attempt to boot device.

Solution

=======

Boot the sever into maintenance mode

Remove the corrupted blv - #rmlv –f hd5

recreate the new hd5 blv logical volume - # mklv -y hd5 -t boot -a e rootvg

create a bootimage - # bosboot -ad /dev/hdisk0

Shutdwon -Fr

Thursday, September 15, 2016

How to reset the unknown root password in aix?

1. Ground work:

Get the hmc details

Get the hscroot password of the HMC

Make sure CD available on the server.

2. Implementation

(Boot the server in sms mode and follow the below steps)

5. Select boot options

1. Select install/Boot device

4. IDE

1. IDE-CDROM

3. Service mode boot

1 Yes (Exit sms)

1. Type 1 and press enter to have english during install

3. Start maintenance mode for system recovery

1. Access a root volume group

0 Continue

1 (Select the boot device)

1. Access this volume group and start a shell

# passwd

Changing password for "root"

root's New password:

Enter the new password again:

sync;sync;sync;reboot

3. Validation

4. Downtime

Yes downtime required for this task.

Note: If you dont have CD to boot up the server in maintenance mode, then you can use the NIM server to get maintenance mode. Please see the link below.

http://howtoaix.blogspot.in/2015/04/how-to-boot-server-into-maintenance.html

Saturday, September 10, 2016

How to reboot HMC server in AIX?

1. Ground work:

Ip address or hostname of the HMC

hscroot password to access the HMC

Get the Frames and Lpars attached to this hmc

cat /proc/uptime --> To check the uptime of the hmc

2. Reboot the HMC using command line

Login to the hmc with hscroot access

hmcshutdown -t now -r --> To reboot the HMC

3. Reboot the HMC using GUI mode

Login to the HMC GUI using hscroot user account

HMC management --> Shutdown or restart --> select Restart HMC --> Click OK

4. Post check

cat /proc/uptime --> To check the uptime of the hmc

Check you can see all the Frames and its Lpars.

Wednesday, September 7, 2016

How to stop and start the hacmp cluster in aix?

1. Ground work:

/usr/es/sbin/clu*/utiI/clRGinfo --> To check the RG online status

lssrc -ls clstrmgrES --> To check the cluster manager is stable on both nodes

cat /var/hacmp/clverify/clverify.log --> To check and confirm the log file has no errors.

Take a snapshot of the cluster

smitty hacmp

extended configuration

snapshot configuration

Create snapshot of the cluster configuration

cluster snapshot name / Cluster snapshot description

The above will create .odm and .info file.

Take all the basic outputs

2. Stop the cluster services

smitty hacmp

system management (C-Spoc)

Stop cluster services

(Provide necessary details) stop now / provide node names/ Bring RG offline.

3. Validation

./clRGinfo --> To check the RG online status

lssrc -ls clstrmgrES --> To check the cluster manager is stable on both nodes

4. Start cluster services

smitty hacmp

system management (C-Spoc)

Start cluster services

(Provide necessary details) start now / provide node names/ Choose Automatic for manage RG

5. Validation

/clRGinfo --> To check the RG online status

lssrc -ls clstrmgrES --> To check the cluster manager is stable on both nodes

cat /tmp/hacmp.out --> To check the HA services and RG status.

Tuesday, September 6, 2016

How to increase memory using dlpar in aix?

How to change memory using dlpar in aix?

1. Ground work:

uname -L --> To find the Lpar name and Lpar id.

lparstat -i --> To check current assigned memory (Desired memory)

prtconf -m --> To check the size of the memory

lsrsrc ibm.managementserver --> To find the hmc details where the lpar belongs to.

Get the hscroot password to access the HMC for the DLPAR operation.

2. Implementation steps

Login to the HMC using hscroot access

system management

servers

select the frame

Select the lpar

Dynamic Logical Partitioning

Processor

Add or remove

change the assigned memory

(change the size of the memory - increase upto Maximum memory limits or decrease upto Minimum memory level)

Click OK

We need to change the same in the partition profile so that when the LPAR is reactivated, it should start with the new value.

Select the Lpar

Configuration

Manage profile

Select the default profile last activated

Action

Edit

Now change the desired memory value

Click OK

4. Validation

lparstat -i --> To check the output of the memory. (Check online memory)

prtconf -m --> To check the size of the memory.

Tuesday, August 30, 2016

How to create EtherChannel in aix?

How to create EtherChannel or Link Aggregation in aix?

Two Ethernet adapters to be aggregated together to form a single Ethernet device.

For example, ent0 and ent1 can be aggregated into an EtherChannel adapter called ent3. And interface en3 would then be configured with an IP address.

1. Ground work:

lsdev -Cc adapter --> To check the adapter details

lsdev -Cc adapter|grep -i etherchannel --> To check already the server has any existing etherchannel

2. Implementation

(In the below example, the physical interfaces ent1 & ent2 are configured for etherchannel)

#smitty etherchannel

EtherChannel / Link Aggregation Adapters ent1 +

Enable Alternate Address no +

Alternate Address [] +

Enable Gigabit Ethernet Jumbo Frames no +

Mode standard +

Hash Mode default +

Backup Adapter ent2 +

Internet Address to Ping []

Number of Retries [] +#

Retry Timeout (sec) [] +#

Now the etherchannel ent3 has been created. then put IP address to the etherchannel ent3

#smit --> Communications Applications and Services > TCP/IP > Minimum Configuration & Startup

Now select the ent3 as a network interface and also provide mandatory info like hostname, netmask and then start now.

3. Validation

lsdev –Cc adapter|grep –i etherchannel --> To confirm ent3 is a etherchannel

entstat -d enX |grep Active --> To check the primary adapter is active

lsdev -Cc adapter --> To check the adapter details

4. Roll back

lsdev –Cc adapter|grep –i etherchannel --> To check the etherchannel

#smitty etherchannel -> Remove An EtherChannel / Link Aggregation’

Reconfigure IP on the adapters

5. Downtime

NO downtime required for this task

Note:

If one adapter fails, network traffic is automatically sent on the next available adapter without disruption to existing user connections. The adapter is automatically failed back to service on the EtherChannel or Link Aggregation when it recovers.

Friday, August 26, 2016

How to find out the FC card is dual port or single port in aix?

We might come across many times that whether our Fiber channel card is single or dual port.

For example, if you want to see your fcs2 is single port or dual port in aix, then use the below command to confirm.

#lsslot -c pci |grep -i fcs2

U1.5-P1-I1 PCI 64 bit, 66MHz, 3.3 volt slot fcs2 fcs3

The above output clearly shows that fcs2 is a dual port fiber channel. That is fcs2 and fcs3.