Symantec Veritas Cluster Server One, Installation Manual

Page: 98 / 210

98 Adding shared storage and testing disks for SCSI-3 compliance
About adding shared storage
About adding shared storage
This section describes how to set up a system with SCSI-3 protection for shared
storage.
If two or more systems in the Policy Master cluster share storage devices, you
can configure and use the I/O fencing feature in VCS One. In the event of a
network failure, I/O fencing protects the shared storage from data corruption.
Requirements for adding shared storage
To meet the requirements for shared storage in a production environment, you
must supply the following:
■
Three coordinator disks that support SCSI-3 persistent reservations. This is
a requirement for I/O fencing, and applies only to the Policy Master. Clients
do not require coordinator disks.
■ Two switches for I/O connection redundancy.
Adding storage devices
For the Policy Master in a production environment, you need to add a minimum
of three coordinator disks in addition to the storage for data. This requirement
does not apply for clients.
To add storage devices to the VCS One cluster
1 Physically connect each storage device to each system in the Policy Master
cluster.
2 On each system in the VCS One cluster, scan the drives, update the Veritas
Volume Manager (VxVM) device list, and reconfigure VxVM DMP with the
new devices with the following command:
vxdisk scandisks
3 On one system in the VCS One cluster, initialize the disks with the following
command:
vxdiskadm
4 Choose 1 Add or initialize one or more disks from the menu.
5 At the prompt, to select devices, type
list
.
6 Type the name of the devices you are adding when prompted to select
devices. Do one of the following:
■ For Solaris or AIX, enter the following:
c3t1d0 c3t2d0