Preventive Measure Before Replacing A Root Disk

This blog is to ensure that we are in proper phase before replacing a failed disk that belongs to rootvg.

Imaging that your volume group is made up of hdisk0 and hdisk1.

hdisk1 is gone bad. Before you replace make sure the hdisk0 is in good condition.

# ipl_varyon -i


PVNAME          BOOT DEVICE     PVID                    VOLUME GROUP ID
hdisk0          YES             00046474e2326aa40000000000000000        0004647400004c00

Make sure the "BOOT DEVICE" is set to "YES".

If not, make the disk a bootable one,

# bosboot -ad /dev/hdisk0

# mkboot -cd /dev/hdisk0

Verify the server is booting from a good disk,

# bootlist -m secure/service/normal -o hdisk0

# bootlist -m both -o -v

NVRAM variable: (boot-device=/pci@fef00000/scsi@e/sd@8:2 /pci@fef00000/scsi@e/sd@c:2)

Path name: (/pci@fef00000/scsi@e/sd@8:2)

Verify the bootable path is updated in NVRAM.

HPUX SG Commands

# cmviewcl : Command to view Service Guard Packages and Resources.

# cmruncl : Command to start cluster service on a node.

# cmhatlcl : Command to stop cluster service on a node.

# cmstartpkg -v <pkg-name> : Command to start a package.

# cmhaltpkg -v <pkg-name> : Command to halt a package.

# cmmodpkg -e <pkg-name> :Command to enable auto-run on a package.

# cmmodpkg -d <pkg-name> : Command to disable auto-run on a package.

AIX Monitoring

Thanks mate for coming up with the query on AIX Performance Monitoring.

Here are few to performance monitoring:

Performance monitored for CPU, Memory, Disk, Network and Virtual Memory.

CPU:

# topas, sar , vmstat : Command to monitor the CPU performance.

The value of "usr+sys" cannot be more than 80%.

Memory:

# sar -m, vmstat, svmon, topas: Command to monitor Memory Peformance.

The value of "avm" and "free" to be noted.

Disk:

# iostat : Command to monitor Disk.

%busy and %tps: Should not be high.

Get the Port in AIX

# netstat -Aan | grep -i "Port Number" : Command on AIX which will tell which program or process running on the respective port.

The ports could be a static port, well known port, dynamic port, registered or un-registered port.

To check the registered port look at the file "/etc/services".

Which Program Is Running On My Port?

# lsof : Litst Open Files, It is one of the utility to find which program or the process running on a specific port.

# lsof -inP | grep "Port Number" 

The command output will show which process is running on which port.