EMC PowerPath basic commands RedHat /CentOS

PowerPath is a multipathing software for Unix operating systems from EMC. If you have ever worked or you are going to work in an environment that includes EMC storage systems it is more than sure that Powerpath will be installed in the Unix hosts.
Following are some notes and tips I’ve been creating since the very first time I found Powerpath, of course this isn’t a full user guide but a sort of personal quick reference. I decide to put it here in the hope that it will be helpful to anyone and for my personal use.

Show powermt command version

Display PowerPath configuration.

 Check for death paths and remove them. List all devices.

Cluster How to CentOS / RedHat 6.2

Step # 1: Mount an ISO file.

# mkdir -p /media/centos
# mount -o loop /dev/centos6X.iso /media/centos

Step # 2: Create repo config file on both the node.

# vi /etc/yum.repos.d/iso.repo
[ISO]
baseurl=file:///media/centos
enabled=1

Save and close the file

Step # 3: Stop firewall on both node.

#chkconfig iptables off
#chkconfig ip6tables off

Step # 4: Disable Selinux.

#vi /etc/selinux/config
disbale selinux

reboot (if you want)

Step # 5: Add hosts entery on both node.

#vi /etc/hosts
192.168.1.10 node1.clustering.com
192.168.1.11 node2.clustering.com (add this entery to both the node)

Step # 6: Create a ricci user & passwd.

#useradd ricci
#passwd ricci

Step # 7: Install Cluster software.

#yum install cman rgmanager luci ricci (on 1st node)
#yum install cman rgmanager ricci

Step # 8: Start service on both node

#service ricci start (on both the node)

Shutting down ricci:
Starting oddjobd:                                          [  OK  ]
generating SSL certificates...  done
Generating NSS database...  done
Starting ricci:                                            [  OK  ]

#service luci start (on 1st node only)
service luci restart
Stop luci...                                               [  OK  ]
Start luci...                                              [  OK  ]
Point your web browser to https://centos1.clsutering.com:8084 (or equivalent) to access luci

Step # 9: Open the firefox.

https://192.168.1.10:8084/

login as root & root passwd

Follow the snap short or you watch youtube to create a Cluster on following link

http://www.youtube.com/watch?v=Cegjvhr7m2s 

RedHat / CentOS Cluster, Which ports need to be open within iptables

cman (Cluster Manager) UDP Ports 5404, 5405

# iptables -I INPUT -m state --state NEW -m multiport -p udp -s 192.168.1.0/24 -d 192.168.1.0/24 --dports 5404,5405 -j ACCEPT

# iptables -I INPUT -m addrtype --dst-type MULTICAST -m state --state NEW -m multiport -p udp -s 192.168.1.0/24 --dports

 dlm (Distributed Lock Manager) TCP Port 21064

# iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 21064 -j ACCEPT

 ricci (part of Conga remote agent) TCP Port 11111

# iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 11111 -j ACCEPT

 modclusterd (part of Conga remote agent) TCP Port 16851

# iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 16851 -j ACCEPT

 luci (Conga User Interface server) TCP Port 8084

# iptables -I INPUT -m state --state NEW -p tcp -s 192.168.1.0/24 -d 192.168.1.0/24 --dport 8084 -j ACCEPT

 igmp (Internet Group Management Protocol)

# iptables -I INPUT -p igmp -j ACCEPT

Linux LVM

1. create LVM partition:

fdisk /dev/[disk]

change partition type from LINUX to LVM

2. initialization LVM partition:

pvcreate /dev/[disk_partiton1] /dev/[disk_partition2]

check commands:

pvs
pvdisplay

3. create LVM group:

vgcreate [group_name] /dev/[disk_partition1] /dev/[disk_partition2]

check commands:

vgs
vgdisplay

4. create logical volumes which is attached to group:

lvcreate -L[size]M -n [vol_name] [group_name]

check commands:

lvs
lvdisplay

5. format volumes:

mkfs.ext3 [LV_name_from_lvdisplay]

---

EXTEND
change size volume:

lvextend -L +[size]M [LV_name_from_lvdisplay]

change size partition:

resize2fs [LV_name_from_lvdisplay]

REDUCE

fsck -f [LV_name_from_lvdisplay]

change size partition:

resize2fs [LV_name_from_lvdisplay] [size]G

change size volume:
lvreduce -L -[size]G [LV_name_from_lvdisplay]