D-PDD-OE-01 Dell PowerProtect Data Domain Operate Practice Questions
Prepare for D-PDD-OE-01 with more than an answer.
- 1
An administrator observes that file system cleaning is running during an unexpected backup ingest window and executes filesys clean stop from the CLI. What is the consequence of stopping cleaning prematurely, and how does the DD OS cleaning throttle behave under default operational conditions?
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Correct answer: C
Executing filesys clean stop causes the cleaning process to terminate immediately, resulting in the loss of all progress made during that cleaning run; restarting cleaning begins from phase one. By default, the cleaning throttle is set to 50% CPU/resource utilization; however, DD OS dynamically scales cleaning allocation up to 100% if no client backup or restore activity is detected.
- 2
A PowerProtect Data Domain appliance hosts a DD Boost storage unit SU_Finance. The storage unit has been configured with the following limits:
- write-stream-soft-limit: 30
- read-stream-soft-limit: 10
- combined-stream-hard-limit: 40
What occurs when a backup application attempts to open a 41st concurrent write stream while 10 read streams and 30 write streams are actively connected?
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Correct answer: A
The combined-stream-hard-limit strictly caps the total number of concurrent active DD Boost streams (reads, writes, and replication) allowed for that storage unit. When this hard limit is reached, any new incoming stream request is immediately rejected before data transfer begins. Soft limits generate alerts that clear after 10 minutes below threshold, but hard limits enforce immediate session rejection.
- 3
True or False: When creating a DD Boost storage unit that is assigned to a Secure Multitenancy (SMT) tenant unit, the associated DD Boost user account must be configured with a role of none.
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Correct answer: A
True. In DD OS Secure Multitenancy (SMT), if a storage unit is assigned to a tenant unit, the user specified for DD Boost authentication must have their system role set to none. If the assigned user has any administrative or operational role other than none (such as admin, limited-admin, or user), the ddboost storage-unit create command will fail.
- 4
An infrastructure architect is designing a disaster recovery solution between two PowerProtect Data Domain systems. The DR plan requires the ability to manually break replication during disaster recovery drills and later resynchronize incremental changes without re-replicating baseline data. Which replication type supports this requirement, and how does it compare to Collection replication?
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Correct answer: A
MTree replication replicates individual MTrees and fully supports breaking replication (replication break) and subsequently reconnecting and resynchronizing incremental changes using replication resync. In contrast, Collection replication mirrors the entire active tier (/data/col1) and completely overwrites the destination; if a Collection replication context is broken, it cannot be resynchronized and must be completely re-initialized.
flowchart TD subgraph MTree Replication SourceMTree[Source: /data/col1/MTree1] -->|Incremental Sync| DestMTree[Dest: /data/col1/MTree1] BreakMTree[Break Context] -.-> ResyncMTree[replication resync supported] end subgraph Collection Replication SourceCol[Source: Entire /data/col1] -->|Complete Overwrite| DestCol[Dest: Entire /data/col1] BreakCol[Break Context] -.-> ReinitCol[Full Re-initialization Only - NO resync] end - 5
A storage administrator is provisioning a service account on a PowerProtect Data Domain system running DD OS. The account will be used by an automated management utility to create snapshots on MTrees, manage virtual tape movement within a Virtual Tape Library (VTL), and wait for replication synchronization. The account must NOT have permissions to delete MTrees, modify network configurations, or alter global system settings. Which built-in DD OS role fulfills these requirements while adhering to the principle of least privilege?
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Correct answer: A
The backup-operator role grants user-level monitoring permissions along with the specific ability to create snapshots on MTrees, import, export, and move tapes within a VTL, copy tapes between pools, manage SSH keys for passwordless script execution, and monitor/wait for replication synchronization. It cannot delete MTrees or change network settings, making it the least-privilege choice. The limited-admin role has broader configuration rights; user is strictly read-only; tenant-admin applies only to Secure Multitenancy tenant units.
- 6
An organization is implementing Retention Lock Compliance on a physical PowerProtect Data Domain appliance. The primary administrator logs in using the default sysadmin account and attempts to create a second user with the security role to serve as a backup security officer. What occurs when sysadmin executes this command, and what is the underlying administrative restriction?
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Correct answer: A
Under DD OS separation-of-duty controls, the default sysadmin account is permitted to create only the very first security officer (a user with the security role). Once that initial security officer account exists, any additional security officer accounts can only be created by an authenticated security officer. This prevents standard administrators from creating unauthorized compliance approvers.
