Dell DR4300 DR Series System Administrator Guide - Page 142

NDMP, iSCSI, VTL and DR Series Specifications, initiators, targets

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NDMP 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 DR Series system VTL container type is designed to work seamlessly with the NDMP protocol. iSCSI 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 the topic, Creating Storage Containers. VTL and DR Series Specifications This topic describes key specifications of VTL support in the DR Series system. • Supported VTL Types - The DR4X00 and DR6000 Series systems support two types of virtual tape libraries. - Standard emulation of StorageTek L700 library - Dell OEM version of the StorageTek L700 library NOTE: The Dell OEM type VTL is supported only with Symantec Backup Exec and Netbackup data management applications (DMAs). NOTE: Refer to the documentation for your specific DR Series system, which includes DMA best practices whitepapers and the latest Dell DR Series Interoperability Guide, for a complete list of the supported DMAs. Visit the following site and select your specific DR Series system to download documentation: http://www.dell.com/powervaultmanuals. • Use of VTL with Virtual DR Series system (DR2000v) - The use of VTL is not supported on the DR2000v. • Number of Tape Drives - Each tape library contains 10 tape drives of the type IBM-LTO-4 ('ULT3580-TD4') • Tapes or Media Sizes- Each library initially is created with 10 slots housing 10 tape media of the default size of 800GiB, which is the equivalent of an LTO4 tape. 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 --add --no_of_tapes 142

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NDMP
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 DR Series system VTL container type is designed to work seamlessly with the NDMP protocol.
iSCSI
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 the topic, Creating
Storage Containers.
VTL and DR Series Specifications
This topic describes key specifications of VTL support in the DR Series system.
•
Supported VTL Types
— The DR4X00 and DR6000 Series systems support two types of virtual tape libraries.
–
Standard emulation of StorageTek L700 library
–
Dell OEM version of the StorageTek L700 library
NOTE:
The Dell OEM type VTL is supported only with Symantec Backup Exec and Netbackup data
management applications (DMAs).
NOTE:
Refer to the documentation for your specific DR Series system, which includes DMA best practices
whitepapers and the latest
Dell DR Series Interoperability Guide
, for a complete list of the supported
DMAs. Visit the following site and select your specific DR Series system to download documentation:
•
Use of VTL with Virtual DR Series system (DR2000v) —
The use of VTL is not supported on the DR2000v.
•
Number of Tape Drives
— Each tape library contains 10 tape drives of the type IBM-LTO-4 (‘ULT3580-TD4’)
•
Tapes or Media Sizes—
Each library initially is created with 10 slots housing 10 tape media of the default size of
800GiB, which is the equivalent of an LTO4 tape.
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>
142