Hpunix Storage Troubleshooting Command

Hi All..The post mainly foucs on how to handle storage relelated problems from the Server End.

#  cat /var/adm/syslog/syslog.log : Analyze the file to find what kind problem has been reported.

# ioscan -funC disk/tape : Command to check the status of the disk and tape and not the device is "no_hw" state.

# ioscan -funH : Command to check the status of the Hardware path from the syslog.log.

# ioscan -fun fc : Command to check the status of the FC HBA.

# fcmsutil /dev/fcd# : Command to check the status of the HBA. Status should be "online" not "Awaiting Link up"

# fcmsutil /dev/fcd# stat -s  : Command to check the statistics of the FC HBA.

# fcmsutil /dev/fcd# get remote all : Command to get all the remote ports connected to this FC HBA.

Multipath in Linux

We all know the concept of Multipathing, which is configured for redundancy purpose to ensure the L UN's from the Storage Team is always available at the server.

1) # multipath -l : Command to view the configured multipath devices.

2) # cd /proc/scsi : Location of the HBA file which contains the WWN Number. In Linux, the HBA files are stored as 0,1.... The same numbering notation reflects in the "multipath" output.

3) /etc/multipath.conf : Configuration file for multipath.

4) # multipathd -k : Command which opens the interactive console with the ">" prompt.

>show paths : Command shows all the configured multipaths.
>show maps : Command shows all mapping of LUN.
 

mksysb error while taking OS backup

# mksysb -vipX /file_system

The above is the command to take a backup of rootvg (Operating System) in AIX.

When the above command fails:

1) Need to check the size of the destination filesystem, which has to match the rootvg.

2) Need to check the # ulimit values.

3) Need to check the /etc/exclude.rootvg file.