EMC E20-393 問題練習

Question No : 1
Which Directory Services can be configured in the Unisphere Settings window?

• A.LDAP
• B.NIS
• C.NDS
• D.Active Directory

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正解:

Question No : 2
When the LUN Snapshot Attach to Host operation is performed, what does the Unity system optionally do before beginning the attach process?

• A.Creates a snapshot of the LUN
• B.Detaches the host from the snapshots of any other LUN
• C.Creates a copy of the snapshot
• D.Deletes all other existing snapshots of the LUN

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正解:

Question No : 3
When a storage resource has a snapshot taken of it, where are writes to the storage resource written?

• A.New space allocated from the storage resource parent pool
• B.New space allocated in 256 MB stripes from FAST Cache
• C.Existing space of the storage resource
• D.Existing space from the Reserves LUN Pool

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正解:

Question No : 4
A Unity 400 system has Data at Rest Encryption licensed and enabled.
Which operation(s) must be performed from the Unisphere Settings window to ensure the system is still operational after SP replacements?

• A.Download Audit Log
• B.Download Checksum
• C.Backup Keystore File
• D.Download Audit Log and Checksum

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正解:
Explanation:
The keystore is tied to the storage processors, so care must be taken when performing service operations in order to preserve the encryption keys. In the event that the chassis and both storage processors need to be replaced, both storage processors should not be replaced at the same time. Instead, the chassis replacement should be followed while retaining one SP until the array is back online before replacing the second SP. In the case that storage processors have already been replaced at the same time and the keystore was lost, the keystore may be restored from an external backup.

Question No : 5
A system administrator has installed the Unity Connection Utility on a Microsoft Windows host. The Windows host is connected to the same physical subnet as a newly installed Unity storage system. When the utility is run, it does not discover any Unity storage systems.
What should be checked on the host that may be preventing the utility from discovering any Unity storage systems?

• A.Java SE version
• B.Ethernet adapter flow control
• C.Network Access Filter Driver
• D.Host firewall services

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正解:
Explanation:
Unity Connection is dependent on Java for some of the components to work.
Incorrect Answers:
B: Ethernet flow control is a mechanism for temporarily stopping the transmission of data on Ethernet family computer networks.
D: As the traffic is within the same physical subnet a firewall would have no effect.
References: https://www.cisco.com/c/en/us/support/docs/unified-communications/unity­connection/117497-probsol-unity-00.html

Question No : 6
Which Unity feature benefits oracle OLTP environments by improving storage utilization?

• A.4 block formatting
• B.Increased SP Cache size
• C.Automatic storage tiering
• D.VVOLS

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正解:
Explanation:
UnityVSA supports the Fully Automated Storage Tiering for Virtual Pool (FAST VP) feature for both block and file data. FAST VP optimizes storage utilization by automatically moving data between and within the storage tiers.
References: https://www.emc.com/collateral/TechnicalDocument/docu69316.pdf (page 11)

Question No : 7
A storage administrator wants to add as asynchronous replication session to a pair of Unity systems with an existing synchronous replication session that is operating correctly.
Which configuration steps are needed?

• A.Create Replication interfaces on both systems. Modify the Replication Connection Mode. Run a Replication Connection Verify and Update operation.
• B.Create Replication Interfaces on the source system. Modify the Mode for Replication Connection. Perform a manual Sync operation on the Asynchronous session.
• C.Create Replication Interfaces on destination system. Establish FC connectivity using the Synchronous FC Ports of each system. Perform a manual Sync operation on the Asynchronous session.
• D.Create Replication Interfaces on both systems. Establish FC connectivity using the Synchronous FC Ports of each system. Run a Verify and Update operation for the Replication Connection

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正解:
Explanation:
To fully configure asynchronous replication between systems, you must do each of following:
- Configure connectivity for the replication interfaces used by asynchronous replication
- Configure the replication connection between systems
- Configure replication sessions between systems
Note: To fully configure synchronous replication, you must complete each of following:
- Configure connectivity for the synchronous replication interfaces
- Create the synchronous replication management ports
- Configure the replication connection between systems
- Configure replication sessions between systems

Question No : 8
A system administrator is browsing their local management station for a Unity license file.
Which file extension is used for Unity license files?

• A..lic
• B..rsa
• C..lin
• D..cer

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正解:
Explanation:
You need to obtain the license file (.lic) from the EMC license management web site.
References: https://www.emc.com/techpubs/vipr/license_vipr-1.htm

Question No : 9
Based on the exhibit, which port can provide either Fibre Channel or Ethernet connectivity for host access?

• A.A
• B.B
• C.C
• D.D

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正解:
Explanation:
Example:



References: http://www.slideshare.net/USSCru/emc-unity-vnxvnx2-emc

Question No : 10
Where do the D@RE encryption/decryption functions occur in the Unity storage system?

• A.Host I/O Modules
• B.Storage Processor Cache
• C.SAS I/O Module
• D.Self-encrypting drives

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正解:
Explanation:
Upon installation and activation of the feature, the following keys are generated by RSA BSAFE and persisted to the Lockbox:
- KEK Wrapping Key (KWK)
- Data Encryption Keys (DEKs) for all bound drives
A new KEK is generated each time the array boots. The KEK is wrapped with the KWK and passed to the SAS controller during the system boot process. Using the persisted KWK, the SAS controller can decrypt the KEK.
Incorrect Answers:
D: Self-Encrypting Drive (SED) technology is another variation of D@RE which is widely used and offers similar functionality as CBE.
However, with SEDs, you have to pay a premium on every drive and only certain drives are offered in SED form.
References: https://www.emc.com/collateral/white-paper/h13296-dare-wp.pdf (page 8)

Question No : 11
Through which protocols are backend storage provisioned to the ESXi host when deploying a UnityVSA system?

• A.iSCSI, SMB, and NFS
• B.iSCSI and NFS only
• C.FC, iSCSI, and NFS
• D.FC and iSCSI only

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正解:
Explanation:
UnityVSA supports SMB, NFS, and iSCSI.
References: https://www.emc.com/collateral/TechnicalDocument/docu69362.pdf (page 4)

Question No : 12
Which operation can be performed from the FAST VP settings section in the Unisphere Settings window?

• A.Enable scheduled data relocation for a specific pool
• B.Exclude pool from the data relocation schedule
• C.Enable scheduled data relocation at the system level
• D.View the data relocation progress between tiers

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正解:
Explanation:
FAST VP accelerates performance of a specific storage pool by automatically moving data within that pool to the appropriate drive technology, based on data access patterns. FAST VP is only applicable to hybrid pools. FAST VP is most effective if data relocations occur during or immediately after normal daily processing. EMC recommends scheduling FAST VP relocations to occur before backups or nightly batch processing.

Question No : 13
A storage administrator wants to create a series of daily snapshots for an existing critical LUN.
How can the snapshots be created?

• A.Snapshot schedules can only be configured within the LUN Creation wizard
• B.From the Pool Properties page, configure the Snapshot schedule
• C.Only manually taken snapshots are supported on existing LUNs
• D.From the LUN Properties page, configure the Snapshot schedule

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正解:
Explanation:
In addition to being created ahead of time on the Snapshot Schedules page, new snapshots schedules may also be created during the process of creating a new storage resource from within the creation wizard as an alternative to selecting an existing schedule.



Incorrect Answers:
C: In addition to being taken manually, snapshots can also be scheduled to be taken automatically at specific times or frequencies.

Question No : 14
What is the minimum memory requirement for a host running VMware ESXi 6.0 to support the deployment of a UnityVSA system?

• A.8 GB
• B.12 GB
• C.16 GB
• D.18 GB

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正解:
Explanation:
A minimum of 12 GB RAM per UnityVSA VM is recommended.
References: https://www.emc.com/collateral/TechnicalDocument/docu69316.pdf (page 2)

Question No : 15
How long before a license expires will UnityVSA send the first alert warning?

• A.3 days
• B.7 days
• C.15 days
• D.1 month

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正解:
Explanation:
As a reminder, UnityVSA displays several alerts in Unisphere prior to the license expiration date.
The table below shows when alerts are generated leading up to the expiration date.