The Network Data Management protocol (NDMP) is used to control data backup and recovery between primary and secondary storage in a network environment. For example, a NAS server (Filer) can talk to a tape drive for the purposes of a backup.
You can use the protocol with a centralized data management application (DMA) to back up data on file servers running on different platforms to tape drives or tape libraries located elsewhere within the network. The protocol separates the data path from the control path and minimizes demands on network resources. With NDMP, a network file server can communicate directly to a network-attached tape drive or virtual tape library (VTL) for backup or recovery.
The QoreStor VTL container type is designed to work seamlessly with the NDMP protocol.
iSCSI or Internet Small Computer System Interface is an Internet Protocol (IP)-based storage networking standard for storage subsystems. It is a carrier protocol for SCSI. SCSI commands are sent over IP networks by using iSCSI. It also facilitates data transfers over intranets and to manage storage over long distances. iSCSI can be used to transmit data over LANs or WANs.
In iSCSI, clients are called initiators and SCSI storage devices are targets. The protocol allows an initiator to send SCSI commands (CDBs) to the targets on remote servers. It is a storage area network (SAN) protocol, allowing organizations to consolidate storage into data center storage arrays while providing hosts (such as database and web servers) with the illusion of locally attached disks. Unlike traditional Fibre Channel, which requires different cabling, iSCSI can be run over long distances using existing network infrastructure.
iSCSI is a low-cost alternative to Fibre Channel, which requires dedicated infrastructure except in FCoE (Fibre Channel over Ethernet). Note that the performance of an iSCSI SAN deployment can be degraded if not operated on a dedicated network or subnet
The VTL container type is designed to work seamlessly with the iSCSI protocol. For details, see Creating a VTL type container .
This topic describes key specifications of VTL support in QoreStor.
NOTE: The Quest type VTL is supported only with VeritasBackup Exec and Netbackup data management applications (DMAs).
NOTE: Refer to the documentation for your specific QoreStor version, which includes DMA best practices whitepapers and the latest QoreStor Interoperability Guide, for a complete list of the supported DMAs. Visit the following site and select your specific QoreStor to download documentation: support.quest.com/qorestor.
You can add additional tapes to the library as needed by editing the container in the GUI or by using the following CLI command:
vtl --update_carts –-name <name> –-add --no_of_tapes <number>
NOTE: For more information about using the CLI, see the QoreStor Command Line Interface Reference Guide.
A library can only contain tapes of the same size. For example, if the library is originally created with 10 tapes of size 10GB, additional tapes of size 10GB can only be added.
The table below details the tape size and capacity configurations supported by each QoreStor installation type.
|Tape||Large installation||Standard installation||Cloud-Optimized installation|
|Size||Max number of slots supported||Size||Max number of slots supported||Size||Max number of slots supported|
The overall steps and recommended guidelines for using and configuring a virtual tape library (VLT) with QoreStor are described below.
Determine the following before creating a container of type VTL.
NOTE: The size of the full and incremental backups will determine the tape capacity size that you set. You should use a larger tape size for full backups and a smaller size for incremental backups that have smaller retention periods. Note that faster expiration periods of incremental backups residing on smaller tapes results in the release of space back to the system for future backups.
Refer to the QoreStor documentation, which includes DMA best practices whitepapers for your specific QoreStor version at support.quest.com/qorestor.
Refer to the topics, Creating Storage Containers and Creating a VTL Type Container, for detailed instructions about creating containers. Refer to the QoreStor Command Line Interface Guide for details about the CLI commands for creating containers.
Refer to the QoreStor Command Line Reference Guide for more details about using these commands.
You can easily check that the library has been created and is available for use by using the following commands.
container --show –verbose
vtl --show --name <container_name> --verbose
See the QoreStor documentation, which includes DMA best practices whitepapers for your specific QoreStor version at:support.quest.com/qorestor.