Thinking rational and requesting pardon

This Friday on Jumma prayer, it happened – I concentrated the "dua" which Imam sb was requesting to Allah. It was all about our sins that we may have done due to which we are flooded every year. I really didn't find any objection within myself over this philosophy but I thought – our sins might not be the only reason for these earthly disasters. On a closer look, EU and US have these problems too. For instance, I thought of the Japan and its last disaster.
I think, it's our negligence and lack of interest to fix the issue that is playing. On a stronger note, it's our struggle to not to change and to resist every factor that tends to change ourselves. Even this attitude encompasses Godly hints that encourage us to look upon ourselves and make us understand the need to adapt.
Birth of every single child is a clear sign that Allah has accounted for the recent technology changes and social evolution, we are passing through. Children were not so "fast and furious" even a decade back. I am 36 and I see people above 50 years are quite afraid of these latest technology and gadgets, even if they want to learn it.

May Allah bless us with right words while praying!

Configure CFS cluster and CFS mount point

Summary:

This LAB was a hands-on for CFS implementation/configuration. CFS cluster will be configured and one mount point will be added.

Prerequisites:

Before you starting configuring VERITAS CFS cluster and start adding new CFS mount point for active-active disk usage; make sure you have:

SF installed with right set of license keys
You have configured VCS on all participant servers (in my case I have two servers guest1 and guest3 with RHEL 5)
You have checked cluster status with "/opt/VRTSvcs/bin/hastatus –summary"
Make sure you virtual IP is accessible
Make sure you have disks presented on cluster participants/nodes. Storage is shared. Just for reference I used iSCSI storage.
Take note of the disks those you have plans to configure in CFS cluster.
Take note of the mount point and volume names.

Cluster Configuration

Following are the steps to configure CFS cluster on both LAB Servers (guest1 and guest3).

Run "/opt/VRTSvxfs/cfs/bin/cfscluster status" to check if CFS is not already configured
1. "[root@guest3 bin]# /opt/VRTSvxfs/cfs/bin/cfscluster status
NODE CLUSTER MANAGER STATE CVM STATE

guest1 running not-running

guest3 running not-running

Error: V-35-41: Cluster not configured for data sharing application
Check cluster status by running "/opt/VRTSvcs/bin/hastatus -summary" and make sure cluster nodes are online.
1. /opt/VRTSvcs/bin/hastatus –summary
  -- SYSTEM STATE
  -- System State Frozen
  
  A guest1 RUNNING 0
  A guest3 RUNNING 0
  
  -- GROUP STATE
  -- Group System Probed AutoDisabled State
  
  B ClusterService guest1 Y N ONLINE
  B ClusterService guest3 Y N OFFLINE

Run "/opt/VRTSvxfs/cfs/bin/cfscluster config" to configure the CFS cluster services (cluster VERITAS volume manager)
1. Let the configuration complete
Check the CFS cluster services status with "/opt/VRTSvxfs/cfs/bin/cfscluster status"

[root@guest3 bin]# /opt/VRTSvxfs/cfs/bin/cfscluster status

Node         : guest1
Cluster Manager     : running
CVM state         : running
No mount point registered with cluster configuration

Node         : guest3
Cluster Manager     : running
CVM state         : running
No mount point registered with cluster configuration
Check which node is master with "vxdctl –c mode"
[root@guest3 bin]# vxdctl -c mode
mode: enabled: cluster active - SLAVE
master: guest1

In my case I am shifting my console to guest1 and will be adding new disks and mount points from there.
[root@guest1 bin]# vxdctl -c mode
mode: enabled: cluster active - MASTER
master: guest1
Check the available disks with "vxdisk list"
Initialize the disk with "/opt/VRTS/bin/vxdisksetup –i disk_2" #in my case its disk_2 that initialize. It could be different from system to system on the bases of SAN.
Verify that disk is initialized with "vxdisk list" – here is expected outcome "disk_2 auto:cdsdisk - - online"
Add new disk group with "vxdg –s init cfsdg disk01=disk_2". Here cfsdg is the name of new disk group with disk_2 added as disk01 and –s is used to make it a shared DG.
Verify the disk group with "vxdg list cfsdg"
Verify the same from "vxprint –hrt output".
[root@guest1 bin]# vxprint -hrt

Disk group: cfsdg

DG NAME NCONFIG NLOG MINORS GROUP-ID
ST NAME STATE DM_CNT SPARE_CNT APPVOL_CNT
DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE
RV NAME RLINK_CNT KSTATE STATE PRIMARY DATAVOLS SRL
RL NAME RVG KSTATE STATE REM_HOST REM_DG REM_RLNK
CO NAME CACHEVOL KSTATE STATE
VT NAME RVG KSTATE STATE NVOLUME
V NAME RVG/VSET/CO KSTATE STATE LENGTH READPOL PREFPLEX UTYPE
PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE
SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE
SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE
SC NAME PLEX CACHE DISKOFFS LENGTH [COL/]OFF DEVICE MODE
DC NAME PARENTVOL LOGVOL
SP NAME SNAPVOL DCO
EX NAME ASSOC VC PERMS MODE STATE
SR NAME KSTATE

dg cfsdg default default 9000 1376650536.16.guest1

dm disk01 disk_2 auto 65536 2017024 -

Note:
Veritas volume manager reports available disk space in 512 byte blocks. There we have 2017024 blocks which calculates to about 985MB of space. #Hope math is easy J
Create volume using "vxassist -g cfsdg make cfsvol 984M" and verify volume creation from "vxprint –hrt". Check for the line
"sd disk01-01 cfsvol-01 disk01 0 2015232 0 disk_2 ENA"
Create file system on new volume using
"mkfs -t vxfs /dev/vx/rdsk/cfsdg/cfsvol" make sure you use right FStype switch and it varies across UNIX platforms
Make new shared DG part of CFS using
"/opt/VRTS/bin/cfsdgadm add cfsdg all=sw"
Disk Group is being added to cluster configuration...
Verify the above with
[root@guest1 bin]# /opt/VRTS/bin/cfsdgadm display cfsdg

NODE NAME ACTIVATION MODE
guest1 sw
guest3 sw
Next is to add this volumes/filesystems to the cluster configuration so they can be mounted on any or all nodes. Mount points will be automatically created
[root@guest1 bin]# /opt/VRTS/bin/cfsmntadm add cfsdg cfsvol /cfs all=cluster

Mount Point is being added...
/cfs added to the cluster-configuration
Verify the newly added mount point with
[root@guest1 bin]# /opt/VRTS/bin/cfscluster status

Node : guest1
Cluster Manager     : running
CVM state         : running
MOUNT POINT SHARED VOLUME DISK GROUP STATUS
/cfs cfsvol cfsdg NOT MOUNTED

Node : guest3
Cluster Manager     : running
CVM state         : running
MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/cfs cfsvol cfsdg NOT MOUNTED
Mount newly added mount point on both cluster nodes using
[root@guest1 bin]# /opt/VRTS/bin/cfsmount all

Mounting...
[/dev/vx/dsk/cfsdg/cfsvol] mounted successfully at /cfs on guest1
Mounting...
[/dev/vx/dsk/cfsdg/cfsvol] mounted successfully at /cfs on guest3
Check cfscluster status
[root@guest1 bin]# /opt/VRTS/bin/cfscluster status

Node : guest1
Cluster Manager : running
CVM state : running
MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/cfs cfsvol cfsdg MOUNTED

Node : guest3
Cluster Manager : running
CVM state : running
MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/cfs cfsvol cfsdg MOUNTED
Verify local mounts as
#df –h
/dev/vx/dsk/cfsdg/cfsvol
984M 36M 890M 4% /cfs

Congratulations! CFS cluster and CFS file system is configured and ready to for Active-Active usage (on both nodes in my case).

Un-configure CFS cluster and mount point

Summary

I have two hosts

Ø Guest1

Ø Guest3

Configured in VCS and CFS. There is one mount point /cfs configured in cfs cluster “cfs_cluster”. My ./cfscluster status output goest here:

[root@guest1 ~]# /opt/VRTS/bin/cfscluster status

Node : guest1

Cluster Manager : running

CVM state : running

MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/cfs cfsvol cfsdg MOUNTED

Node : guest3

Cluster Manager : running

CVM state : running

MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/cfs cfsvol cfsdg MOUNTED

Steps

1- Find master node in cluster – run following command

a. Vxdctl –c mode

2- Check if cfs mount point is visible in current mounted volumes

a. #df –h

3- Check cluster status by running

a. /opt/VRTSvcs/bin/hastatus -sum

-- SYSTEM STATE

-- System State Frozen

A guest1 RUNNING 0

A guest3 RUNNING 0

-- GROUP STATE

-- Group System Probed AutoDisabled State

B ClusterService guest1 Y N ONLINE

B ClusterService guest3 Y N OFFLINE

4- Check CFS cluster status.

a. /opt/VRTS/bin/cfscluster status #Output is already shared in summary

5- Check current disk and DG configuration by running

a. #vxdisk list

b. #vxprint –hrt

6- Umount the CFS volume

a. /opt/VRTSvxfs/cfs/bin/cfsumount /cfs

Unmounting...

/cfs got successfully unmounted from guest1

/cfs got successfully unmounted from guest3

7- Delete the mount point from CFS cluster configuration

a. /opt/VRTS/bin/cfsmntadm delete /cfs

Mount Point is being removed...

/cfs deleted successfully from cluster-configuration

8- Un-configure the CFS cluster

a. ./cfscluster unconfig

Unconfiguring cluster setup between nodes: [guest1guest3]

VCS WARNING V-16-1-50035 No Group dependencies are configured

Vxfsckd removed from cluster configuration

Cluster Mount resource definition removed from cluster configuration

Vxfsckd resource definition removed from cluster configuration

Deleting the cvm configuration.

CVM configuration deleted.

cfscluster: Cluster unconfigured successfully

9- Check CFS cluster status

a. [root@guest1 bin]# ./cfscluster status

NODE CLUSTER MANAGER STATE CVM STATE

guest1 running not-running

guest3 running not-running

Error: V-35-41: Cluster not configured for data sharing application

10- Check VCS status as: