migratepv VS replacepv

what is the difference between migratepv and replacepv?

replacepv command simply moves all the logical partitions on one physical volume to another physical volume.  The command is designed to make it easy to replace a disk in a mirrored configuration.

migratepv command also very similar.

The biggest difference is that migratepv allows you to copy the LPs on a logical volume basis, not just on a physical volume basis. For example, if you have a disk that has two logical volumes on it and you want to reorganize and put each logical volume on a different disk, migratepv can do it.

migratepv -l lv01 hdisk1 hdisk2
migratepv -l lv02 hdisk1 hdisk3

In this case, the logical partitions from logical volume lv01 are moved from hdisk1 to hdisk2.
The logical partitions from logical volume lv02 are moved to hdisk3.

Change Username Max Length in AIX - Quick HOWTO

In AIX 5.3,

To change the default length of username:

# chdev -l sys0 -a max_logname=9
sys0 changed

To check the current length of username:

# lsattr -El sys0 -a max_logname
max_logname 9 Maximum login name length at boot time True
# getconf LOGIN_NAME_MAX 21

Hope this quick tip helps someone..!

AIX NFS Error and Solution - RPC: 1832-010 Authentication error

[root-prodsrv1][/]> mount prodsrv2:/Softwares /wasinstall
mount: 1831-008 giving up on:
prodsrv2:/SwRep
vmount: The file access permissions do not allow the specified action.
NFS fsinfo failed for server prodsrv2: error 7 (RPC: 1832-010 Authentication error)


[root-prodsrv1][/]> nfso -a | grep port
portcheck = 0
nfs_use_reserved_ports = 0


[root-prodsrv1][/]> nfso -po portcheck=1
Setting portcheck to 1
Setting portcheck to 1 in nextboot file


[root-prodsrv1][/]> nfso -po nfs_use_reserved_ports=1
Setting nfs_use_reserved_ports to 1
Setting nfs_use_reserved_ports to 1 in nextboot file


[root-prodsrv1][/]> mount prodsrv2:/Software /wasinstall
[root-prodsrv1][/]>

Common NFS errors & solutions

Common NFS errors & solutions:

1."Server Not Responding" Message
2.  "Access Denied" Message
3."Permission Denied" Message
4.  "Device Busy" Message

Error 1: If You Receive an NFS "Server Not Responding" Message

ping the nfs server from client

1.ping "nfs serer name or ip"

2./usr/bin/rpcinfo -p servername

The rpcinfo command should display the following processes:

    * portmap
    * nfs
    * mountd
    * status
    * nlockmgr
    * llockmgr

If any of these processes is not running, follow the below steps:


a.Make sure the /etc/rc.config.d/nfsconf file on the NFS server contains the following lines:

NFS_SERVER=1
START_MOUNTD=1

b.Make sure that the /etc/inetd.conf file on the NFS server does not contain a line to start rpc.mountd.
If it does, make sure the START_MOUNTD variable in /etc/rc.config.d/nfsconf is set to 0.

c.Issue the following command on the NFS server to start all the necessary NFS processes:

#/sbin/init.d/nfs.server start

Error 2: If You Receive an "Access Denied" Message

a.check the FS is exported or not

#/usr/sbin/showmount -e server_name

(If it is not exported means u have to edit /etc/exports file in NFS server and put the necessary entry and
then run the command
/usr/sbin/exportfs -a)

Error 3 :If You Receive a "Permission Denied" Message

a.Check the mount options in the /etc/fstab file on the NFS client. A directory you are attempting to write to may have
been mounted read-only.

b.Issue the ls -l command to check the HP-UX permissions on the server directory and on the client directory
that is the mount point. You may not be allowed access to the directory.

c.Issue the following command on the NFS server:

/usr/sbin/exportfs

Or, issue the following command on the NFS client:

/usr/sbin/showmount -e server_name

d. Check the export permissions on the exported directory. The directory may have been exported read-only to your client.
The system administrator of the NFS server can use the remount mount
option to mount the directory read/write without unmounting it

Error 4 : If You Receive a "Device Busy" Message

a.If you received the "device busy" message while attempting to mount a directory, try to access the mounted directory.
  If you can access it, then it is already mounted.
 
b.If you received the "device busy" message while attempting to unmount a directory, a user or process is currently using the directory. Wait until the process completes, or follow these steps:
 
 1.Issue the following command to determine who is using the mounted directory:

       /usr/sbin/fuser -cu local_mount_point

   The fuser(1M) command will return a list of process IDs and user names that are currently using the directory
   mounted under local_mount_point. This will help you decide whether to kill the processes or wait for them to complete.

 2. To kill all processes using the mounted directory, issue the following command:

            /usr/sbin/fuser -ck local_mount_point

 3. Try again to unmount the directory.

Installing EMC PowerPath Keys

 

This describes how to configure the EMC PowerPath registration keys.

First, check the current configuration of PowerPath:

# powermt config
Warning: all licenses for storage systems support are missing or expired.

The install the keys:

# emcpreg -install
=========== EMC PowerPath Registration ===========
Do you have a new registration key or keys to enter?[n] y
Enter the registration keys(s) for your product(s),
one per line, pressing Enter after each key.
After typing all keys, press Enter again.
Key (Enter if done): P6BV-4KDB-QET6-RF9A-QV9D-MN3V
1 key(s) successfully added.
Key successfully installed.
Key (Enter if done):
1 key(s) successfully registered.

Note: the license key used in this example is not valid