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QoreStor 6.1.0 - User Guide

Introducing the QoreStor documentation Introducing QoreStor Setting up your QoreStor system Configuring QoreStor settings Managing containers Managing storage groups Managing replications Managing Users Managing QoreStor Remotely Monitoring the QoreStor system Support, maintenance, and troubleshooting

CIFS ACL support

QoreStor supports the use of access control lists (ACLs) for CIFS and share-level permissions. By definition, an ACL is simply a list of permissions that can be associated with any network resource.

Each ACL can contain access control entries (ACEs) that define or describe the permissions for an individual user or a group of users. An ACL can consist of zero (meaning that all users have access) or a number of ACEs that define specific permissions on a per-user or per-group basis.

NOTE:If an ACE list is empty (meaning that it contains zero entries), this means that all access requests will be granted.

An ACL describes the entities that are allowed to access a specific resource. ACLs are a built-in access control mechanism in the Windows operating systems.

NOTE: QoreStor supports setting up share-level permissions for a CIFS share using a Microsoft Windows administrative tool. Share-level permissions let you control access to shares.


The Network File System (NFS) is a file system protocol that is designated to be a file server standard, and its protocol uses the Remote Procedure Call (RPC) method of communication between computers. Clients can access files via the network similar to the way that local storage is accessed.

NFS is a client-server application in which a client can view, store, and update files on a remote system just like they are working on a local system. System or Network Administrators can mount all or a portion of a file system, and the file system (or portion) that is mounted can be accessed using the privileges assigned to each file.

NOTE: If you want to do a mount on AIX, you must set the nfs_use_reserved_ports and portcheck parameters first. The parameters cannot be set to 0. For example: root@aixhost1 / # nfso -po portcheck=1 root@aixhost1 / # nfso -po nfs_use_reserved_ports=1

Rapid NFS and Rapid CIFS benefits

When Rapid NFS and Rapid CIFS are used with QoreStor they offer the following benefits:

  • Reduce network utilization and DMA backup time
    • Chunk data and perform hash computation on the client; transfer chunked hash files on the back-end
    • Reduce the amount of data that must be written across the wire
  • Improve performance
  • Support DMAs such as CommVault, EMC Networker, and Tivoli Storage Manager. For the current list of supported DMAs, see the QoreStor Interoperability Guide.
  • Compatible with existing NFS and CIFS clients — just need to install a plug-in (driver) on the client
    • Can use Rapid NFS and Rapid CIFS to accelerate I/O operations on any client — including a client that uses home-grown backup scripts
    • Can service multiple and concurrent media server backups

Rapid NFS and Rapid CIFS

Rapid NFS and Rapid CIFS enable write operation acceleration on clients that use QoreStor replication and NFS or CIFS file system protocols. Similar to OST and RDS, these accelerators allow for better coordination and integration between QoreStor 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 QoreStor Interoperability Guide.

Rapid NFS is a new client file system type that ensures that only unique data is written to QoreStor. 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 QoreStor.

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 "Configuring and Using Rapid NFS and Rapid CIFS".

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