Dell DL1000 Betriebsanweisung PDF herunterladen (Seite 9)

the agent. The Core then stores the snapshot backups in the repository, which resides on the appliance.

Cores are paired for replication.

The repository resides on internal storage within the Core. The Core is managed by accessing the

following URL from a JavaScript enabled web browser: https://CORENAME:8006/apprecovery/admin.

Dell DL1000 Smart Agent

The Smart Agent is installed on the machine that is protected by the Core. The Smart Agent tracks the

changed blocks on the disk volume and then snaps an image of the changed blocks at a predefined

interval of protection. The incremental block-level snapshots’ forever approach prevents repeated

copying of the same data from the protected machine to the Core.

After the agent is configured, it uses smart technology to keep track of changed blocks on the protected

disk volumes. When the snapshot is ready, it is rapidly transferred to the Core using intelligent multi-

threaded, socket-based connections.

Snapshot Process

Your DL1000 protection process begins when a base image is transferred from an agent machine to the

Core, which is the only time a full copy of the machine needs to be transported across the network under

normal operation, followed by incremental snapshots forever. The DL1000 Agent for Windows uses

Microsoft Volume Shadow copy Service (VSS) to freeze and quiesce application data to disk to capture a

file-system-consistent and an application-consistent backup. When a snapshot is created, the VSS writer

on the target server prevents content from being written to the disk. During the process of halting of

writing content to disk, all disk I/O operations are queued and resume only after the snapshot is

complete, while the operations in progress will be completed and all open files will be closed. The

process of creating a shadow copy does not significantly impact the performance of the production

system.

Your DL1000 uses Microsoft VSS because it has built-in support for all Windows internal technologies

such as NTFS, Registry, Active Directory, to flush data to disk before the snapshot. Additionally, other

enterprise applications, such as Microsoft Exchange and SQL, use VSS Writer plug-ins to get notified

when a snapshot is being prepared and when they have to flush their used database pages to disk to

bring the database to a consistent transactional state. The captured data is rapidly transferred and stored

on the Core.

Replication — Disaster Recovery Site Or Service Provider

Replication is the process of copying recovery points and transmitting them to a secondary location for

the purpose of disaster recovery. The process requires a paired source-target relationship between two

cores. Replication is managed on a per-protected-machine basis; meaning, backup snapshots of a

protected machine are replicated to the target replica core. When replication is set up, the source core

asynchronously and continuously transmits the incremental snapshot data to the target core. You can

configure this outbound replication to your company's own data center or remote disaster recovery site

(that is, a self-managed‚ target core) or to a managed service provider (MSP) providing off-site backup

and disaster recovery services. When you replicate to an MSP, you can use built-in workflows that let you

request connections and receive automatic feedback notifications.

In the case of a severe outage, DL1000 supports fail-over and fail-back in replicated environments. The

target core in the secondary site can recover instances from replicated agents and immediately

commence protection on the failed-over machines. After the primary site is restored, the replicated core

can fail-back data to agents from the primary site.

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Dell DL1000 Betriebsanweisung Seite 9