If you experience system performance concerns, like:
· Exceeding your backup window,
· If throughput appears to be slower than expected
Consider the following:
1. Check the Streams columns of the
system show performance command
to make sure that the system is not exceeding the recommended write and read stream count.
2. Look specifically under rd (active read streams) and wr (active write streams) to determine the stream count. Compare this to the recommended number of streams allowed for your system.
3. If you are unsure about the recommended streams number, contact Data Domain Support for assistance.
Distributed segment processing (DSP):
An optional feature to DD Boost shares the deduplication process with the application host. The application host performs a comparison of the data to be backed up with its library and seeks and sends only unique data segments to the Data Domain system, thus improving data throughput and reducing load on the Data Domain system.
An EMC Data Domain customer has 1 TiB of data for their initial backup. They estimate a 10 percent change rate in the data each day.
Assuming the compression rate of the initial backup is 5x and the compression rate of each incremental backup is 10x, how much space is needed for the initial backup and six incremental backups?
5 X compression
=è 200 GB
10% change each day
10 X compression
============ 100GB @ 10X======== 10 GB
1- Space for initial + 6 Incremental
A customer is interested in deploying DD Boost for their current EMC Data Domain system. They are aware of Distributed Segment Processing (DSP) and want to know the data flow when they enable DSP.
What describes the data flow from the backup host to the Data Domain system?
|Segmenting, fingerprinting, fingerprint filtering, and compression occur on the backup host.Writes occur on the Data Domain.|
|Segmenting, fingerprinting, and fingerprint filtering occur on the backup host.Compression and writes occur on the Data Domain.|
|Fingerprinting, compression, and fingerprint filtering occur on the backup host.Segmenting and writes occur on the Data Domain.|
|Segmenting, fingerprinting, and compression occur on the backup host.Fingerprint filtering and writes occur on the Data Domain.|
Segmenting, fingerprinting, and compression occur on the backup host.
Fingerprint filtering and writes occur on the Data Domain.
What is the correct sequence of the SISL data flow in an EMC Data Domain system?
|Verify if segments are unique|
|Store unique segments|
|Data stream enters RAM|
1. Data stream enters RAM
2. Create segments
3. Create fingerprints
4. Verify if segments are unique
5. Store unique segments
When installing a new EMC Data Domain system with the Extended Retention software, what is the correct sequence of installation steps?
1. Install the hardware
2. Define the Data Domain system information for the site
3. Perform the initial system configuration
4. Configure the system for data access
5. Configure the optional software
6. Perform the optional additional system configuration
An organization currently writes backups to an EMC Data Domain system and then creates encrypted copies of their backups on tapes. These tapes are then shipped to a third-party offsite vault.
They are now planning to deploy a second Data Domain system to a data center at their corporate headquarters as a replication target to replace the use of the offsite tapes. The two sites are connected through a secure connection.
Where should encryption be applied on the Data Domain systems to ensure a similar level of data security as achieved by their current process?
|Encrypt the data at rest at the destination site|
|Encrypt the replication context|
|Encryption is not required|
|Encrypt the data at rest at the source site|
Encrypt the data at rest at the destination site
There are two types of encryption:
1. Encryption for data in flight means encryption as data is transported. Only at the source and the destination is the data’s true meaning apparent.
2. Encryption for data at rest involves data that is physically stored in an encrypted manner, such that the data can be removed or copied and taken to another environment. It cannot be accessed without decrypting it.
NetBackup storage lifecycle policies provide the ideal vehicle for initial backups as well as the ability to create duplicate backup images. Storage lifecycle policy duplication tasks initiate optimized duplication jobs on OpenStorage storage units. Consider the following:
When setting the MTU size for an Ethernet interface on an EMC Data Domain system, what is the maximum supported value?
Supported values are from 350 to 9014. For 100 Base-T and gigabit networks, 1500 is the standard default.
A customer is configuring Symantec NetBackup with an EMC Data Domain system. What is required before DD Boost can be used?
|Restart the Symantec NetBackup server|
|Download and install the plug-in on the media server|
|Download and install the plug-in on the master server|
|Restart the Data Domain file system|
DD Boost for NetBackup has two components.
1. The DD Boost Library is embedded in the OpenStorage
plug-in that runs on NetBackup media servers.
2. The DD Boost Server is built into DD OS 4.8 or later and runs on a Data Domain system. The two components integrate seainlessly across the IT infrastructure to enable theses benefits.
Download and install the plug-in on the media server
Which port(s) on the expansion shelf should the HBA port be connected to on an EMC Data Domain controller?
|Host or expansion ports|
|Host portAnswer#Host port|
|Here’s a picture of a Data Domain controller with two expansion shelves.There are some general cabling rules. Let’s review them.
First, The Data Domain controller HBA port should always connect to the Host port of an Expansion Shelf.
In other words, the HOST port on the Expansion Shelf connects upstream to the Data Domain Controller.
Second, the expansion port on the Expansion Shelf is used to connect downstream to another expansion shelf
And Third, the expansion port on the last shelf should be empty. It does not connect back to the Data Domain controller.
Refer to the Graphic.
When did the last file system cleaning operation occur on the EMC Data Domain system?
Answer# March 5
The lines of the graph show measurements for:
Capacity (not shown) —
The total amount of disk storage available for data on the Data
Domain system. The amount is shown on the Space Used (left) vertical axis of the graph.
Clicking the Capacity checkbox changes the view of space between GiB and TiB. The
capacity on the example system is 7.5 TiB and does not show the capacity line in this
Post-comp (as shown in the larger shaded area in the graph) —
The total amount of disk storage in use on the Data Domain system. This is shown with the Space Used (left) vertical axis of the graph.
Comp Factor (as shown in the slide as a single black line on the graph) —
The amount of compression the Data Domain system has performed with the data it received (compression ratio). This is shown on the Compression Factor (right) vertical axis of the graph.
A grey vertical line appears on the graph each time a file system cleaning operation was started. Roll over a data line representing cleaning to see the date and time cleaning was started and the duration of the process.
Data Movement (not shown) —
The amount of disk space moved to the archiving storage
area (if the Archive license is enabled).
A customer is preparing their site for the installation of an EMC Data Domain DD990 and four ES30 expansion shelves. How many rack units (RU) are required for the installation?
Expansion Shelves are 3 U size
DD990 is 4 U size
A customer has a backup environment using EMC NetWorker with an EMC Data Domain system. What is the correct sequence of steps to implement DD Boost in this environment?
· Create a Storage Unit
· Set up DD Boost User
· Configure a Data Domain device with a backup pool
· Enable DD Boost
1. Set up DD Boost User.
2. Enable DD Boost.
3. Create a Storage Unit
4. Configure a Data Domain device with a backup pool
In this exercise, you prepare the Data Domain systems for integration with the backup environment enabled for DO Boost. On the Data Domain system, you log into the CU as an
administrative user as shown. Verify that the file system is enabled and running by entering: # filesys status
The results show that the file system is enabled and running. Add the DO Boost license using the license key that Data Domain provided. For this exercise, type:# license add ABCD-DCBA.
The license has been added.Establish the DD Boost username and password for the Data Domain system. Note that only one user can be configured for DO Boost access on a Data
Domain system at any time. First add a user by typing:# user add boostadmin password abcl23
Now type:# ddboost set user•name boostadmin
Now enter:# ddboost enable
Enable users to monitor backup events captured by SNMP traps and add hosts to receive the SNMP traps. add a community string of public with read-only permissions by entering:#
snmp add ro-community public
Confirm the addition by entering “y” for “yes.”
Now enter:# snmp enable
Add the host to receive traps depending on the site configuration. For this exercise, enter:snmp add trap-host adminl2 version v2c community public
Now you can create one or more storage units on each Data Domain system that will be used with the backup management software. Note that when integrating with NetWorker, this
step can be performed automatically using the NetWorker Device Configuration wizard. Each storage unit name on a single Data Domain system must be unique. However, when
performing file replication, the storage unit name on the two Data Domain systems used in the replication must be the same. On the Data Domain system, enter:# ddboost storage-unit
Repeat the last step for each Boost-enabled Data Domain system. Congratulations, you successfully prepared the Data Domain systems for integration with the backup environment
enabled for DO Boost.
This exercise covers steps for preparing NetBackup to perform backups to Data Domain Systems with DO Boost, Including configuring Disk Storage Servers, and creating a Storage
Lifecycle Policy. Prior to these steps, you should have performed procedures to prepare both the source and target Data Domain Systems for DO Boost. You will configure both DD Boost
Data Domain systems as Disk Storage Servers, performing these steps twice. To begin, after opening the NetBackup administration console, select Configure Disk Storage Servers to
launch the wizard.
To select the type of disk storage to configure, choose OpenStorage from the menu.
Choose Open Storage.
Normally you type in the details shown here for the Data Domain backup OD Boost server. We’ve entered the details for you to save time. Click Next to continue.
The progress is shown here, and indicates completion. Click Next.
The storage server was successfully created. Click Next to continue with disk pool creation.
Select OpenStorage (Data Domain) in the list box.
Select the dddev-03 DO Boost backup Data Domain system in the list box.
Select the OST Backup volume, then click Next.
Name the disk pool by entering: OSTBackupPool
A summary is provided here. Click Next to start the disk pool creation.
The status pane shows that the configuration is completed. Click Next.
Name the storage unit by entering: OSTBackup
What is the purpose of the NDMP tape server function on an EMC Data Domain system?
When configuring an NDMP over TCP/IP configuration, a Data Domain system starts an NDMPtape server. NDMPtape servers are accessed via a standard NDMP protocol.
The host server must have NDMP client software installed and running. This client software is used to remotely access the Data Domain VTL.
Devices assigned to the access group TapeServer on the Data Domain system can be accessed only by the NDMP TapeServer
The NDMP tape server on the Data Domain system converts this data to tape I/O, and writes to the Data Domain VTL.
A customer is purchasing an EMC Data Domain system pre-installed in a Data Domain rack. The data center requires that the system be powered from multiple existing AC power sources for redundancy.
What must be done to enable the rack to draw power from redundant AC sources?
Power Distribution Panel (PDP)
Data Domain Rack consists of dual redundant power distribution panels (PDP)
Each system is supplied by 1st set of PDPs
The 2nd set of PDPs is installed, but not attached
Adding the 2nd PDP doubles the power available to the rack, however, additional
building AC circuits are required to plug into the 2nd set of PDP’s
The PDPs are connected to the external power mains through power cords
Power Distribution Unit (P DU)
. Power Distribution Units (PDU) are connected to the PDPs mounted within the
The shelves and system controllers are plugged into the PDU
Which backup software products include the EMC DD Boost libraries?
For EMC, Oracle, and Quest users, the Data Domain Boost library is already included in recent
versions of software. Before enabling DD Boost on Symantec Backup Exec, and NetBackup, a special
OST plug-in must be downloaded and installed on the backup host. The plug-in contains the
appropriate DD Boost Library for use with compatible Symantec product versions. Consult the most
current DD Boost Compatibility Guide to verify compatibility with your specific software and Data
Domain operating system versions. Both the compatibility guide and versions of OpenStorage (OST)
plug-in software are available through the Data Domain support portal at:
Which link aggregation methods are supported on an EMC Data Domain system?
LACP, Balance-xor, and Round Robin
A Data Domain system supports two aggregation methods: round robin and balance-xor (you set it up
manually on both sides).
Where can the system serial number be verified in EMC Data Domain System Manager?
After your Data Domain system is installed, you should verify that you have the correct model number, DD OS
version, and serial number to ensure that they match what you ordered. The System page in the System
Manager gives you important system information without requiring you to enter multiple commands.
To verify your model number, system uptime, and serial number in the System Manager:
1. Click the Maintenance tab.
2. Verify the model number, DD OS version, system uptime, and serial number.
Refer to the Graphic.
When implementing an EMC Data Domain system at a customer site, you notice that Post-Comp plotting is not visible. What could be the reason for this behavior?
Full system capacity is displayed
Data reduction factors depend on the type of data being backed up. Some types of challenging (deduplication-unfriendly) data types include:
. pre-compressed (multimedia, .mp3, .zip, and .jpg)
. pre-encrypted data
What is indicated by a slow blinking blue LED on a disk in an EMC Data Domain DD2500 system?
Drive is powered up but is not handling I/O activity
Blue: normal Blue blinking: drive activity Amber: drive fault