Veritas Cluster File System

Veritas Cluster File System (CFS)

CFS allows the same file system to be simultaneously mounted on multiple nodes in the cluster.

The CFS is designed with master/slave architecture. Though any node can initiate an operation to create,

delete, or resize data, the master node carries out the actual operation. CFS caches the metadata in

memory, typically in the memory buffer cache or the vnode cache. A distributed locking mechanism,

called GLM, is used for metadata and cache coherency among the multiple nodes.

The examples here are :

1. Based on VCS 5.x but should also work on 4.x

2. A new 4 node cluster with no resources defined.

3. Diskgroups and volumes will be created and shared across all nodes.

Before you configure CFS

1. Make sure you have an established Cluster and running properly.

2. Make sure these packages are installed on all nodes:

VRTScavf Veritas cfs and cvm agents by Symantec

VRTSglm Veritas LOCK MGR by Symantec

3. Make sure you have a license installed for Veritas CFS on all nodes.

4. Make sure vxfencing driver is active on all nodes (even if it is in disabled mode).

Check the status of the cluster

Here are some ways to check the status of your cluster. On these examples, CVM/CFS are not configured

yet.

# cfscluster status

NODE CLUSTER MANAGER STATE CVM STATE

serverA running not-running

serverB running not-running

serverC running not-running

serverD running not-running

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

# vxdctl -c mode

mode: enabled: cluster inactive

# /etc/vx/bin/vxclustadm nidmap

Out of cluster: No mapping information available

# /etc/vx/bin/vxclustadm -v nodestate

state: out of cluster

# hastatus -sum

-- SYSTEM STATE

-- System State Frozen

A serverA RUNNING 0

A serverB RUNNING 0

A serverC RUNNING 0

A serverD RUNNING 0

Configure the cluster for CFS

During configuration, veritas will pick up all information that is set on your cluster configuration. And will

activate CVM on all the nodes.

# cfscluster config

The cluster configuration information as read from cluster

configuration file is as follows.

Cluster : MyCluster

Nodes : serverA serverB serverC serverD

You will now be prompted to enter the information pertaining

to the cluster and the individual nodes.

Specify whether you would like to use GAB messaging or TCP/UDP

messaging. If you choose gab messaging then you will not have

to configure IP addresses. Otherwise you will have to provide

IP addresses for all the nodes in the cluster.

------- Following is the summary of the information: ------

Cluster : MyCluster

Nodes : serverA serverB serverC serverD

Transport : gab

-----------------------------------------------------------

Waiting for the new configuration to be added.

========================================================

Cluster File System Configuration is in progress...

cfscluster: CFS Cluster Configured Successfully

Check the status of the cluster

Now let's check the status of the cluster. And notice that there is now a new service group cvm. CVM is

required to be online before we can bring up any clustered filesystem on the nodes.

# cfscluster status

Node : serverA

Cluster Manager : running

CVM state : running

No mount point registered with cluster configuration

Node : serverB


CVM state : running


Node : serverC


CVM state : running


Node : serverD


CVM state : running


# vxdctl -c mode

mode: enabled: cluster active - MASTER

master: serverA

# /etc/vx/bin/vxclustadm nidmap

Name CVM Nid CM Nid State

serverA 0 0 Joined: Master

serverB 1 1 Joined: Slave

serverC 2 2 Joined: Slave

serverD 3 3 Joined: Slave

# /etc/vx/bin/vxclustadm -v nodestate

state: cluster member

nodeId=0

masterId=1

neighborId=1

members=0xf

joiners=0x0

leavers=0x0

reconfig_seqnum=0xf0a810

vxfen=off

# hastatus -sum

-- SYSTEM STATE


A serverA RUNNING 0

A serverB RUNNING 0

A serverC RUNNING 0

A serverD RUNNING 0

-- GROUP STATE

-- Group System Probed AutoDisabled State

B cvm serverA Y N ONLINE

B cvm serverB Y N ONLINE

B cvm serverC Y N ONLINE

B cvm serverD Y N ONLINE

Creating a Shared Disk Group and Volumes/Filesystems

This procedure creates a shared disk group for use in a cluster environment. Disks must be placed in disk

groups before they can be used by the Volume Manager.

When you place a disk under Volume Manager control, the disk is initialized. Initialization destroys any

existing data on the disk.

Before you begin, make sure the disks that you add to the shared-disk group must be directly attached

to all the cluster nodes.

First, make sure you are on the master node:

serverA # vxdctl -c mode

mode: enabled: cluster active - MASTER

master: serverA

Initialize the disks you want to use. Make sure they are attached to all the cluster nodes. You may

optionally specify the disk format.

serverA # vxdisksetup -if EMC0_1 format=cdsdisk

serverA # vxdisksetup -if EMC0_2 format=cdsdisk

Create a shared disk group with the disks you just initialized.

serverA # vxdg -s init mysharedg mysharedg01=EMC0_1 mysharedg02=EMC0_2

serverA # vxdg list

mysharedg enabled,shared,cds 1231954112.163.serverA

Now let's add that new disk group in our cluster configuration. Giving all nodes in the cluster an option

for Shared Write (sw).

serverA # cfsdgadm add mysharedg all=sw

Disk Group is being added to cluster configuration...

Verify that the cluster configuration has been updated.

serverA # grep mysharedg /etc/VRTSvcs/conf/config/main.cf

ActivationMode @serverA = { mysharedg = sw }

ActivationMode @serverB = { mysharedg = sw }

ActivationMode @serverC = { mysharedg = sw }

ActivationMode @serverD = { mysharedg = sw }

serverA # cfsdgadm display

Node Name : serverA

DISK GROUP ACTIVATION MODE

mysharedg sw

Node Name : serverB


mysharedg sw

Node Name : serverC


mysharedg sw

Node Name : serverD


mysharedg sw

We can now create volumes and filesystems within the shared diskgroup.

serverA # vxassist -g mysharedg make mysharevol1 100g

serverA # vxassist -g mysharedg make mysharevol2 100g

serverA # mkfs -F vxfs /dev/vx/rdsk/mysharedg/mysharevol1

serverA # mkfs -F vxfs /dev/vx/rdsk/mysharedg/mysharevol2

Then add these volumes/filesystems to the cluster configuration so they can be mounted on any or all

nodes. Mountpoints will be automatically created.

serverA # cfsmntadm add mysharedg mysharevol1 /mountpoint1

Mount Point is being added...

/mountpoint1 added to the cluster-configuration

serverA # cfsmntadm add mysharedg mysharevol2 /mountpoint2

Mount Point is being added...

/mountpoint2 added to the cluster-configuration

Display the CFS mount configurations in the cluster.

serverA # cfsmntadm display -v

Cluster Configuration for Node: apqma519

MOUNT POINT TYPE SHARED VOLUME DISK GROUP STATUS MOUNT OPTIONS

/mountpoint1 Regular mysharevol1 mysharedg NOT MOUNTED crw

/mountpoint2 Regular mysharevol2 mysharedg NOT MOUNTED crw

That's it. Check you cluster configuration and try to ONLINE the filesystems on your nodes.

serverA # hastatus -sum

-- SYSTEM STATE


A serverA RUNNING 0

A serverB RUNNING 0

A serverC RUNNING 0

A serverD RUNNING 0

-- GROUP STATE

-- Group System Probed AutoDisabled State

B cvm serverA Y N ONLINE

B cvm serverB Y N ONLINE

B cvm serverC Y N ONLINE

B cvm serverD Y N ONLINE

B vrts_vea_cfs_int_cfsmount1 serverA Y N OFFLINE

B vrts_vea_cfs_int_cfsmount1 serverB Y N OFFLINE

B vrts_vea_cfs_int_cfsmount1 serverC Y N OFFLINE

B vrts_vea_cfs_int_cfsmount1 serverD Y N OFFLINE

B vrts_vea_cfs_int_cfsmount2 serverA Y N OFFLINE

B vrts_vea_cfs_int_cfsmount2 serverB Y N OFFLINE

B vrts_vea_cfs_int_cfsmount2 serverC Y N OFFLINE

B vrts_vea_cfs_int_cfsmount2 serverD Y N OFFLINE

VCS - Adding NIC/IP Resource

haconf -makerw

# hares -add vvrnic NIC db2inst_grp

VCS NOTICE V-16-1-10242 Resource added. Enabled attribute must be set before agent monitors

# hares -modify vvrnic Device ce3

# hares -modify vvrnic NetworkType ether

# hares -add vvrip IP db2inst_grp

VCS NOTICE V-16-1-10242 Resource added. Enabled attribute must be set before agent monitors

# hares -modify vvrip Device ce3

# hares -modify vvrip Address "10.67.196.191"

# hares -modify vvrip NetMask "255.255.254.0"

# hares -link vvrip vvrnic

# hagrp -enableresources db2inst_grp

# hares -online vvrip -sys server620

# haconf -dump –makero

VCS - Adding Filesystem Resource

How to create a file system using VERITAS Volume Manager, controlled under VERITAS Cluster Server

Details:

Following is the algorithm to create a volume, file system and put them under VERITAS Cluster Server

(VCS).

1. Create a disk group

2. Create a mount point and file system

3. Deport a disk group

4. Create a service group

Add following resources and modify attributes:

Resources Name Attributes

1. Disk group, disk group name

2. Mount block device, FSType, MountPoint

Create dependency between following resources:

1. Mount and disk group

Enable all resources in this service group.

The following example shows how to create a raid-5 volume with a VxFS file system and put it under VCS

control.

Method 1 - Using the command line

1. Create a disk group using Volume Manager with a minimum of 4 disks:

# vxdg init datadg disk01=c1t1d0s2 disk02=c1t2d0s2 disk03=c1t3d0s2 disk04=c1t4d0s2

# vxassist -g datadg make vol01 2g layout=raid5

2. Create a mount point for this volume:

# mkdir /vol01

3. Create a file system on this volume:

# mkfs -F vxfs /dev/vx/rdsk/datadg/vol01

4. Deport this disk group:

# vxdg deport datadg

5. Create a service group:

# haconf -makerw

# hagrp -add newgroup

# hagrp -modify newgroup SystemList <sysa> 0 <sysb> 1

# hagrp -modify newgroup AutoStartList <sysa>

6. Create a disk group resource and modify its attributes:

# hares -add data_dg DiskGroup newgroup

# hares -modify data_dg DiskGroup datadg

7. Create a mount resource and modify its attributes:

# hares -add vol01_mnt Mount newgroup

# hares -modify vol01_mnt BlockDevice /dev/vx/dsk/datadg/vol01

# hares -modify vol01_mnt FSType vxfs

# hares -modify vol01_mnt MountPoint /vol01

# hares -modify vol01_mnt FsckOpt %-y

8. Link the mount resource to the disk group resource:

# hares -link vol01_mnt data_dg

9. Enable the resources and close the configuration:

# hagrp -enableresources newgroup

# haconf -dump -makero

Method 2 - Editing /etc/VRTSvcs/conf/config/main.cf

# hastop -all

# cd /etc/VRTSvcs/conf/config

# haconf -makerw

# vi main.cf

Add the following line to end of this file:

group newgroup (

SystemList = { sysA =0, sysB=1}

AutoStartList = { sysA }

)

DiskGroup data_dg (

DiskGroup = datadg

)

Mount vol01_mnt (

MountPoint = "/vol01"

BlockDevice = " /dev/vx/dsk/datadg/vol01"

FSType = vxfs

)

vol01_mnt requires data_dg

# haconf -dump -makero

# hastart -local

Check status of the new service group.

------------------------------------------------------------------------------------

Here's an actual example.

# umount /backup/pdpd415

# vxdg deport bkupdg

# haconf -makerw

# hares -add bkup_dg DiskGroup pdpd415_grp

# hares -modify bkup_dg DiskGroup bkupdg

# hares -add bkupdg_bkup_mnt Mount pdpd415_grp

# hares -modify bkupdg_bkup_mnt BlockDevice /dev/vx/dsk/bkupdg/bkupvol

# hares -modify bkupdg_bkup_mnt FSType vxfs

# hares -modify bkupdg_bkup_mnt MountPoint /backup/pdpd415

# hares -modify bkupdg_bkup_mnt FsckOpt %-y

# hares -link bkupdg_bkup_mnt bkup_dg

# hagrp -enableresources pdpd415_grp

# hares -online bkup_dg -sys sppwd620

# hares -online bkupdg_bkup_mnt -sys sppwd620

# haconf -dump –makero

Veritas Cluster File System

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