Storage Area Networks (SANs) provide a networking paradigm that provides easily reconfigurable connectivity between any subset of computers, disk storage and interconnecting hardware such as switches, hubs and bridges. A SAN can contain a huge number of devices connected using either arbitrated or switched fabric. A SAN that has thousands or tens of thousands of connected devices is difficult to administer using a simple disk group model. Veritas CommandCentral Storage software allows you to configure storage groups and storage accounts. Using the CommandCentral Storage software, you can allocate SAN storage more prudently and administer your complex SAN environments more effectively.
This feature of
vxassist is designed to work in conjunction with SAL (SAN Access Layer) in Veritas CommandCentral Storage. When VxVM with SAN-aware
vxassist is installed on a host where SAL is also installed, it is recommended that you create a user named
root under SAL. This allows
vxassist to use the
root login to contact the SAL daemon (
sald) on the primary SAL server without needing to specify the
sal_username attribute to
Dividing a Storage Area Network into storage groups, shows how you might choose to set up storage groups within a SAN.
Dividing a Storage Area Network into storage groups
Click the thumbnail above to view full-sized image.
In this example, the boundaries of the storage groups are based on the performance characteristics of different makes of disk array and on geographic location.
vxassist utility in Veritas Volume Manager understands storage groups that you have defined using the CommandCentral Storage software.
vxassist supports a simple language that you can use to specify how disks are to be allocated from pre-defined storage groups. This specification language defines the confinement and separation criteria that
vxassist applies to the available storage to choose disks for creating, resizing or moving a volume.
To use the CommandCentral Storage storage groups with
vxassist, perform the following steps in the order listed:
vxspcshowcommand to discover the device names of disks that have a specified set of attributes, or to list the attributes of specified disks.
vxdiskadmcommand or the VEA to configure the disks that you found in the previous step into VxVM disk groups.
vxassistto create volumes on disks that are selected by matching specified criteria for the values of storage group attributes. The usual restriction applies that a volume may only be created using disks from a single disk group.