35 questions · Data Lifecycle Management · All types, answers revealed
Which THREE factors influence the disk I/O performance of an indexer cluster?
Simultaneous searches increase disk reads.
Why this answer
Disk I/O is impacted by ingestion rate, search concurrency, and the type of storage used (e.g., SSD vs HDD).
In a multisite indexer cluster, a bucket with replication factor 3 has its primary copy in Site 1 and secondary copies in Site 2. A network partition occurs. Which setting determines if the indexer will accept new data if it cannot reach the Site 2 indexers?
This dictates the policy for site-based replication requirements.
Why this answer
site_replication_factor determines the behavior for bucket replication across sites.
A Splunk architect is calculating the storage requirement for an index that receives 500GB of raw data per day, with a 30-day retention period and a standard 50% compression ratio. If the raw data volume doubles, how should the retention period be modified to maintain the original storage footprint?
Halving the retention offsets the doubling of the daily ingestion volume.
Why this answer
If volume doubles (1000GB/day) and storage space must remain constant, the retention must be halved (15 days) to keep the total stored data volume equivalent.
When designing an index strategy for high-frequency search performance, which component of the bucket lifecycle has the highest impact on disk I/O performance?
Hot/Warm buckets are the active write and primary search targets.
Why this answer
Hot/Warm buckets are actively written to and searched, placing the highest load on the storage subsystem.
A Splunk architect is performing capacity planning. If an indexer receives 1TB of logs daily, and the Splunk compression factor is 1:10 (resulting in 100GB of storage per day), how much storage is needed for 30 days of data, including a 20% overhead for bucket overhead and metadata?
Correct calculation: (100GB/day * 30 days) * 1.2 = 3600GB = 3.6TB.
Why this answer
100GB * 30 days = 3000GB. 3000GB * 1.20 = 3600GB or 3.6TB.
Which THREE conditions cause a bucket to transition from Warm to Cold?
When the path size is exceeded, space must be cleared.
Why this answer
Transitions to cold happen based on the maxWarmDBCount, maxTotalDataSizeMB, or total data age limits.
Which THREE settings should you tune to optimize Data Model Acceleration?
Retention limit.
Why this answer
Acceleration is managed through the datamodels.conf file, specifically regarding backfill, retention, and cron schedules.
Which TWO settings are crucial when planning for bucket replication in a clustered environment?
This defines replication requirements across sites.
Why this answer
Replication factor and site replication factor are the core components of cluster bucket redundancy.
What happens to data when a bucket's 'frozenTimePeriodInSecs' is reached?
The bucket is permanently removed or archived.
Why this answer
Once the frozen time period is reached, the bucket is frozen (moved to the frozen path or deleted).
What is the primary architectural trade-off when using very short 'maxHotSpanSecs' values?
Too many small buckets create significant metadata overhead.
Why this answer
Frequent bucket rotation leads to a higher number of buckets, which increases indexer overhead and metadata management.
Which TWO types of storage can be used for indexer data?
Supported modern backend.
Why this answer
Splunk supports local storage and network storage (NAS/SAN) or object storage for SmartStore.
In a SmartStore architecture, what happens when a bucket is evicted from local cache?
Eviction allows for local disk reclamation while preserving data on the backend.
Why this answer
In SmartStore, eviction removes the copy from the indexer's local disk, but the bucket persists in remote object storage.
What is the purpose of the 'homePath.maxDataSizeMB' setting in indexes.conf?
This setting limits the total volume of hot and warm data.
Why this answer
It restricts the total size of the homePath directory, which forces bucket rotation if exceeded.
What is the consequence of setting 'maxDataSize' to 'auto_high_volume' for an index?
auto_high_volume is optimized for high-volume indexers using 10GB bucket limits.
Why this answer
auto_high_volume creates 10GB buckets to reduce the number of buckets, which is beneficial for large indexing volumes.
Which path is used to define where Splunk stores the actual indexed data for a specific index?
homePath holds the hot and warm buckets where active data lives.
Why this answer
homePath is the primary location for hot and warm buckets.
An indexer cluster is suffering from 'bucket repair' loops. What is the most likely cause related to the bucket lifecycle?
If a bucket cannot be read or verified, the indexer will repeatedly attempt to repair it.
Why this answer
Bucket corruption is often due to improper shutdown or hardware failure, but repair loops specifically indicate an issue with the bucket's integrity on disk.
Which TWO of these factors determine when a bucket rolls from hot to warm?
Size-based roll.
Why this answer
Bucket rolling is triggered by either the size (maxDataSize) or time (maxHotSpanSecs).
Which THREE actions occur during the SmartStore bucket lifecycle?
Data is persisted to remote storage.
Why this answer
SmartStore involves moving buckets to remote storage, caching locally, and evicting local copies.
Which bucket state is considered read-only but still resides on high-performance storage?
Warm buckets are read-only and kept on high-performance storage.
Why this answer
Warm buckets are read-only (once closed) and reside on high-performance storage.
A user wants to restore data from frozen buckets. What is the process for making this data searchable again?
Restoring involves placing data in the thawedPath and running the rebuild tool.
Why this answer
The data must be thawed by copying the bucket to the thawed directory and restarting/triggering a refresh.
A large-scale Splunk deployment is experiencing 'bucket rolling' latency. Upon investigation, you determine that the indexer is waiting for the indexer cluster manager to acknowledge the bucket status. Which indexer clustering setting directly impacts the speed of bucket replication during the rolling process?
Increasing max_replication_streams allows more concurrent bucket replications, reducing rolling latency.
Why this answer
replication_factor impacts the number of copies, but the throughput of bucket replication is managed by the replication queue settings.
Which metric is the best predictor of the storage needed for an indexer in a cluster?
Capacity is primarily driven by daily data volume.
Why this answer
Daily ingestion volume is the primary driver for capacity planning.
Which THREE configuration changes are required to enable bucket freezing to an external archival location using a custom script?
This defines the script to be executed.
Why this answer
Setting coldToFrozenScript, ensuring the script is in the path, and setting the frozenPath are required.
Which THREE components are part of the Splunk index directory structure?
Stores cold buckets.
Why this answer
homePath, coldPath, and thawedPath are the main directory components.
A Splunk architect notices that Data Model Acceleration summaries are consuming excessive disk space. Which configuration setting in datamodels.conf should be adjusted to limit the storage impact of these summaries?
This limits how far back in time the summary is kept on disk.
Why this answer
acceleration.max_time defines the retention period for the accelerated summaries.
Which configuration file and stanza are used to define the bucket lifecycle policy for a custom index named 'customer_data'?
Lifecycle settings for specific indexes are defined in indexes.conf.
Why this answer
indexes.conf is the standard file where index-specific lifecycle settings are defined.
Which TWO of these are valid methods for controlling bucket retention?
Size-based retention.
Why this answer
Retention is controlled by time or size (total disk space).
If you have a search head cluster and you want to accelerate a data model, where are the resulting summary files stored?
Accelerated summaries are stored as buckets on the indexers.
Why this answer
The accelerated summaries are stored on the indexers that contain the source data.
Which THREE actions can help resolve 'disk-full' status on an indexer?
This deletes data sooner.
Why this answer
To free disk space, you can reduce retention, increase compression, or move cold data to a larger volume.
You need to reduce the number of small buckets created in your index. Which parameter should you increase?
Increasing the max size allows for larger buckets, reducing total count.
Why this answer
Increasing maxDataSize increases the size of each bucket, thereby reducing the total count of buckets.
An architect is tasked with enabling SmartStore for an indexer cluster. What is the primary requirement for the remote storage backend?
SmartStore relies on S3-compatible APIs for object storage interaction.
Why this answer
SmartStore requires S3-compatible object storage (AWS S3, Google Cloud Storage, or Azure Blob Storage).
An architect is designing an index lifecycle for compliance. The requirement is to keep data for exactly 7 years. Which setting must be configured to prevent premature deletion?
This is the setting that enforces retention length.
Why this answer
frozenTimePeriodInSecs must be set to the equivalent of 7 years in seconds.
You are configuring Data Model Acceleration on a heavy forwarder. Why is this not a recommended architectural practice?
Acceleration summaries are stored as buckets on indexers and managed by search heads.
Why this answer
Heavy forwarders lack the indexing and search head components required to manage and serve accelerated summaries efficiently.
Which TWO of the following are valid bucket states in the Splunk index lifecycle?
Hot buckets are the current write target.
Why this answer
Hot, Warm, Cold, and Frozen are the standard lifecycle states.
Which THREE items should be included in an index sizing capacity plan?
Retention determines the total volume stored.
Why this answer
Capacity planning requires knowing the ingestion rate, retention requirements, and compression ratios to estimate space.
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