Physical Storage Considerations

Teradata Database on VMware Base, Advanced, Enterprise Tiers Getting Started Guide

brand
Cloud
prodname
Teradata Database on VMware
vrm_release
Deployer 3.01
category
Configuration
Installation
featnum
B035-5958-097K

Become familiar with physical storage considerations before deploying Teradata Database on VMware.

For performance reasons, each Teradata Database system virtual disk should reside on a RAID-1 pair of physical disks. Common vSphere configurations utilize disk arrays, iSCSI, and other types of storage. Although these types of storage can be used, doing so may compromise performance, especially if other non-Teradata virtual machines are sharing the same storage configuration.

We assume you are using internal storage and each LUN/datastore is based on a RAID-1 drive pair. If you are using external storage, such as a disk array, consider the performance and data redundancy implications. The primary requirement is each TPA vNode must have at least three database system pdisks. By default, each pdisk resides on a separate datastore. However, if you want multiple pdisks to reside on a single datastore, you can set the uniqueDisks property in the common.IT.properties.json file to FALSE to apply an override. Setting it to false may be useful when you have only a single large datastore. Determine the performance and data redundancy implications when using different RAID configurations, external versus internal storage, or if you have multiple pdisks on the same datastore versus having each pdisk reside on its own datastore.

For information on how to obtain the scripts referenced below, see Installation Components.
Configuration Script Type Details
Low-Level LUN If you have not already configured the low-level LUN storage, you can download the following scripts to configure specific Dell and HP hardware:
.\dell.storage.configuration.ps1
.\hp.storage.configuration.ps1

These scripts create RAID-1 LUNs on the internal storage of the specific hardware. The scripts enable you to print and validate the settings of the already-existing Dell vdisks or HP logical drives based on recommended settings.

If you are configuring storage not supported by these scripts, such as an external disk array, see your disk array documentation for information on how to configure the storage.

vSphere Datastore If you have not already configured the datastores, you can download the following script to create datastores on a given ESXi host.
  • createDatastores.ps1

The script only creates datastores on storage devices that are not already associated with another datastore. If the ESXi host is connected to more than one storage adapter, the script asks you to specify which adapter to use.