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DR Series Software 3.2.0.3 - Administrator Guide

Introduction to the DR Series System Documentation Understanding the DR Series System Setting Up the DR Series System Hardware Configuring the DR Series System Settings Managing DR Series Storage Operations Monitoring the DR Series System Using Global View Using the DR Series System Support Options Configuring and Using Rapid NFS and Rapid CIFS Configuring and Using Rapid Data Access with Dell NetVault Backup and with Dell vRanger Configuring and Using RDA with OST
Understanding RDA with OST Guidelines Terminology Supported RDA with OST Software and Components Best Practices: RDA with OST and the DR Series System Setting Client-Side Optimization Configuring an LSU Installing the RDA with OST Plug-In Configuring DR Series System Information Using NetBackup Backing Up Data From a DR Series System (NetBackup) Using Backup Exec With a DR Series System (Windows) Understanding the OST CLI Commands Understanding RDA with OST Plug-In Diagnostic Logs Collecting Diagnostics Using a Linux Utility Guidelines for Gathering Media Server Information
Configuring and Using VTL Configuring and Using Encryption at Rest Troubleshooting and Maintenance Supported Ports in a DR Series System Getting Help
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Group (group in which the owner belongs)
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Other (other users with an account on the system)

Each of these three user types support the following access permissions:

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Read (read access that allows user to read files)
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Write (write access that allows user to create or write to a file)
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Execute (access that allows user to execute files or traverse directories in the filesystem)
 
NOTE: A root user has all levels of permission access, and a user can be a member of a single group or of multiple groups (up to 32 groups are allowed in Unix).
Parent topic 

Windows Permissions Guidelines

Windows Permissions Guidelines

To enable Windows access, the DR Series system supports access control lists (ACLs) that contain zero or more access control entries (ACEs), and an empty ACE list grants all access requests. The Windows New Technology File System (NTFS) uses ACLs as part of the security descriptor (SD) process, which requires permissions to access such filesystem objects as files and directories. ACLs support two levels of users:

Owners
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Groups

Both Owners and Groups have Security IDs (SIDs) that define and identify an object owner or the group owning an object. ACEs in an ACL consist of a SID, a specific permission that either allows or denies access and also defines which of the following inheritance settings apply:

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IO—inherit-only: not used for access checking.
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OI—object inherit: new files get this ACE added.
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CI—container inherit: new directories get this ACE added.

Windows NTFS ACLs include the following read, write, append, execute, and delete permissions that allow users to:

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Synchronize access
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Read data or list the directory
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Write data or add a file
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Append data or add a folder
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Read Extended Attributes (EAs)
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Write EAs
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Execute file or traverse folders
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Delete child or delete folders
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Delete a file

The Owner user type has two default permissions:

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Write discretionary ACL
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Read control
Parent topic 

Rapid NFS and Rapid CIFS

Rapid NFS and Rapid CIFS

Rapid NFS and Rapid CIFS enable write operation acceleration on clients that use DR replication and NFS or CIFS file system protocols. Similar to OST and RDS, these accelerators allow for better coordination and integration between DR Series system backup, restore, and optimized deduplication operations with Data Management Applications (DMAs) such as CommVault, EMC Networker, and Tivoli Storage Manager. For the current list of qualified DMAs, see the Dell DR Series System Interoperability Guide.

Rapid NFS is a new client file system type that ensures that only unique data is written to the DR Series system. It uses user space components and file system in user space (FUSE) to accomplish this. Metadata operations such as file creates and permission changes go through the standard NFS protocol, whereas write operations go through RDNFS.

Rapid CIFS is a Windows-certified filter driver that also ensures that only unique data is written to the DR Series system.

All chunking and hash computations are done at the media or client server level.

Rapid NFS and Rapid CIFS require you to install a plug-in on the client or media server, depending on your DMA and configuration. For details, see the Configuring and Using Rapid NFS and Rapid CIFS chapter.

DR Rapid for the DR Series System

DR Rapid for the DR Series System

DR Rapid is developed by Dell and provides a logical disk interface for use with network storage devices. DR Rapid allows for better coordination and integration between DR Series system backup, restore, and optimized duplication operations with backup applications, such as Dell NetVault Backup (NVBU).

The DR Series system and backup application integration is done using DR Rapid plugins developed by Dell. Plugins allow backup application control over backup image creation, deletion, and duplication. They also allow deduplication and compression operations to happen on the client-side so that network traffic can be reduced.

DR Rapid allows the supported backup applications to communicate directly with the DR Series system and determine whether a specific chunk of data already exists on the system. If the data already exists, only the pointers need to be updated on the DR Series system, and the duplicate chunk of data does not need to be transferred to the system. This process provides two benefits: it improves the overall backup speed, and also reduces the network load.

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