Pass the EMC EMC Certification E20-598 Questions and answers with CertsForce

Explanation/Reference:

While performing the backup of system state using Windows VSS plugin choose the option "Create DisasterRecovery Backup", this option will allow you to perform restore of the system using "Avamar disaster RecoveryWizard"

https://community.emc.com/thread/114519

Explanation/Reference:

Are next type of node is the Storage Node, which run a process called gsan. This service communicates withthe avtar command on the individual backup clients. Avtar communicates with a storage nodes gsan process,then that storage node spreads the data across the available data nodes.

Avamar Node Types and Processes

There are several different types of Nodes within an Avamar Server. The Utility node is the identity of theAvamar Server and provides the bulk of the internal Avamar server processes such as: Avamar Administrator(used to manage the Avamar Server from a gui), cron jobs, DNS, NTP, external authentication, web access,MCS and EMS.

MCS (Management Console Server) provides centralized management including scheduling of backups,restore of backups, monitoring and reporting.

EMS (Enterprise Manager Server) provides web based management for multiple Avamar Servers as well asmonitoring and configuration for Avamar Replication.

Web Access provides access to documentation, backup plug-ins as well as remote File System restoreaccess to end users.

Are next type of node is the Storage Node, which run a process called gsan. This service communicates withthe avtar command on the individual backup clients. Avtar communicateswith a storage nodes gsan process,then that storage node spreads the data across the available data nodes.

A Spare Node is an active node that is present in a multi-node RAIN (Redundant Array of Independent Nodes)grid. The interesting thing about the Spare Node is that it is NOT a hot spare. There is a procedure in placethat needs to be followed when a failed Storage Node occurs. In fact, the Avamar Server doesn’t even care ifthe Spare Node is powered on, so if you are a “Green” conscience company, feel free to leave the Spare Nodepowered down. EMC Best Practice is to leave the Spare Node up and active though.Avamar Backups clients can be installed with 2 different types of client plug-ins: File System and Databases.The Avamar client uses 2 processes in the backup and restore process: Avtar and Avagent. The Avagentprocess listens for backup/restore work orders from the MCS service on the Utility Node using port 28002 andexecutes the avtar command that handles the backup/restore processes and communicates with the gsanservice on the storage nodes. This process is depicted in the included picture above.Lastly, in a previous blog, I discussed the 2 different licensable options for Avamar and how the disks arecomprised in each Storage Nodes type. These are depicted in the picture above as well as a breakdown ofhow the disks are structured.

http://whughgriffin.wordpress.com/2009/06/03/avamar-system-overview/

Explanation/Reference:

http://whughgriffin.wordpress.com/2011/07/05/avamar-ads-gen4-node-hardware/

Explanation/Reference:

The most important thing to do on a client with so many files is to make sure that the file cache is sizedappropriately. The file cache is responsible for the vast majority (>90%) of the performance of the Avamarclient. If there's a file cache miss, the client has to go and thrash your disk for a while chunking up a file thatmay already be on the server.

So how to tune the file cache size?

The file cache starts at 22MB in size and doubles in size each time it grows. Each file on a client will use 44bytes of space in the file cache (two SHA-1 hashes consuming 20 bytes each and 4 bytes of metadata). For 25million files, the client will generate just over 1GB of cache data.

http://jslabonte.blogspot.com/2013/08/avamar-and-large-dataset-with-multiples.html

Explanation/Reference:

The total number of client connections which can be made to the Avamar server will vary according towhich operations are currently running, how the connection is made and the number of data nodeswhich are online.

Various parameters in the /usr/local/avamar/var/mc/server_data/prefs/mcserver.xml file govern thisbehavior.

The number of concurrent jobs for the whole grid will not exceed max_current_jobs.

AVE 7 is#

Assisted Ref# https://emc--c.na5.visual.force.com/apex/KB_HowTo?id=kA0700000004Nlp

Explanation/Reference:

During the backup window, an Avamar server has 18 backup "slots" per node, minus one slot that is globallyreserved for restore.