Dell PowerProtect DD Deploy 2023 flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Inline deduplication

Deduplication performed as data arrives at the system, before it is written to disk. Segments are hashed and only unique ones stored, reducing write bandwidth and capacity needs.

Data Invulnerability Architecture

Dell PowerProtect DD end-to-end data integrity design combining block checksums, write verification, continuous fault detection, and background scrubbing to detect and correct silent corruption.

NVRAM write cache

Battery-backed or flash-protected memory that absorbs incoming writes and journals metadata, protecting acknowledged writes across power loss until they reach disk.

Usable capacity formula

Usable capacity must cover full backup size times retained copies divided by expected dedup ratio, plus 20 to 30 percent headroom for metadata, scrub, and growth.

Replication bandwidth sizing

Required link bandwidth equals the daily change rate divided by the replication window in seconds. The initial baseline copy transfers full data and needs a longer window.

Site power planning

Provide redundant PDUs on separate feeds, confirm voltage and frequency for the model, and size circuits from published power draw at expected load with margin.

NTP configuration

Add time servers with ntp add server, then enable the service. Accurate clocks are required for Kerberos, Active Directory, logging, and replication consistency.

License installation

Apply capacity and feature license keys with license add or the GUI, then confirm with license show. Features include replication, encryption, extended retention, and DD Boost.

Autosupport

Automated reporting feature that sends system health and configuration data to support and configured recipients, enabling proactive case creation and weekly reporting.

LACP bonding

Link aggregation mode 4 that combines multiple physical interfaces into one logical link, requiring matching switch configuration and increasing throughput and redundancy.

Replication ports

DD Replicator uses port 2051 for control and 2052 for data transfer between systems. Firewalls between sites must permit both directions.

adminaccess firewall

Command set that restricts management access to specified subnets. Add allowed subnets with adminaccess add and verify with adminaccess show to avoid locking yourself out.

Cloud tier

Optional storage tier on supported models that moves cold, deduplicated data to validated object storage under a data movement policy, freeing active tier capacity.

Dedup ratio

Logical pre-deduplication data divided by physical post-deduplication data. The reported compression figure also includes local and global compression effects.

filesys clean

Garbage collection process that reclaims space from unreferenced segments. Space is not returned to the filesystem until cleanup runs, so schedule it during low I/O.

DD Boost

Dell backup interface that moves part of the deduplication work to the backup server, reducing network traffic. Requires a license and uses storage units for client isolation.

DD Boost storage unit

Logical container created with ddboost storage-unit create that isolates a client or backup application, supports quotas, and scopes replication and access control.

NFS export creation

Command nfs add /path clients options publishes a filesystem path to specified clients. Verify with nfs show and restrict exports to known subnets.

VTL emulation

Virtual tape library feature that presents emulated tape libraries and drives over Fibre Channel, allowing existing tape-based backup software to write to disk.

MTree replication

Directory-level replication that copies only a specified directory tree from source to destination. It is the most common configuration for backup data protection.

Replication initialization

Process that performs the initial baseline copy of data to the destination before incremental replication begins. It transfers full data and needs the longest window.

Replication throttle

Configuration that limits replication bandwidth, optionally by schedule, so replication does not saturate backup or production links during peak hours.

Replication failover

Promoting the destination system after breaking the replication context, then reconfiguring clients to use it. Reverse replication is planned after the source recovers.

Support bundle

Diagnostic archive generated with support bundle generate containing logs, configuration, and system state, used for escalation and root-cause analysis.

filesys show space

Command reporting active tier usable, used, and available capacity plus percentage consumed. It is the primary check before the system reaches read-only state.

Replication lag diagnosis

Check replication show status and stats, verify link bandwidth and errors, and review throttle settings. Persistent lag means bandwidth is below the change rate.

Alert notification setup

Configure alert recipients and thresholds with alerts add, then verify with alerts show. SNMP traps can forward alerts to enterprise monitoring platforms.

DD OS upgrade check

Confirm the target release is a supported upgrade path in the release notes, run system upgrade, and verify with system show version before and after.

Global compression

Compression applied to unique segments after deduplication, reducing the physical footprint further. It combines with dedup ratio in the reported effective compression.

External shelf addition

Capacity expansion by adding ES or DS enclosures. Add with storage add enclosure, then verify detection and licensing with storage show all.

sysadmin account

Default full-privilege local account on a new system. Best practice is to create role-based accounts for daily work and protect sysadmin credentials.

Static route addition

Command net route add destination mask gateway installs a route for a remote subnet, needed when replication or backup traffic must leave via a non-default path.