W E K A
4.0
4.0
  • WEKA v4.0 documentation
  • WEKA System Overview
    • About the WEKA system
    • SSD capacity management
    • Filesystems, object stores, and filesystem groups
    • Weka networking
    • Data lifecycle management
    • Weka client and mount modes
    • Weka containers architecture overview
    • Glossary
  • Getting Started with Weka
    • Quick installation guide
    • Manage the system using the Weka CLI
    • Manage the system using the Weka GUI
    • Run first IOs with WekaFS
    • Getting started with Weka REST API
  • Planning & Installation
    • Prerequisites for installation
    • Weka installation on bare metal
      • Planning a Weka System Installation
      • Prepare the system for Weka installation
        • SR-IOV enablement
      • Obtain the Weka software installation package
      • Weka cluster installation
      • WEKA legacy system installation process
      • Add clients
    • Weka installation on AWS
      • Self-service portal
      • CloudFormation template generator
      • Deployment types
      • AWS outposts deployment
      • Supported EC2 instance types
      • Add clients
      • Auto scaling group
      • Troubleshooting
  • Performance
    • Weka performance tests
      • Test environment details
  • WekaFS Filesystems & Object Stores
    • Manage object stores
      • Manage object stores using the GUI
      • Manage object stores using the CLI
    • Manage filesystem groups
      • Manage filesystem groups using the GUI
      • Manage filesystem groups using the CLI
    • Manage filesystems
      • Manage filesystems using the GUI
      • Manage filesystems using the CLI
    • Attach or detach object store buckets
      • Attach or detach object store bucket using the GUI
      • Attach or detach object store buckets using the CLI
    • Advanced data lifecycle management
      • Advanced time-based policies for data storage location
      • Data management in tiered filesystems
      • Transition between tiered and SSD-only filesystems
      • Manual fetch and release of data
    • Mount filesystems
    • Snapshots
      • Manage snapshots using the GUI
      • Manage snapshots using the CLI
    • Snap-To-Object
      • Manage Snap-To-Object using the GUI
      • Manage Snap-To-Object using the CLI
    • Quota management
  • Additional Protocols
    • NFS
      • Manage NFS networking using the GUI
      • Manage NFS networking using the CLI
    • SMB
      • Manage SMB using the GUI
      • Manage SMB using the CLI
    • S3
      • S3 cluster management
        • Manage the S3 service using the GUI
        • Manage the S3 service using the CLI
      • S3 buckets management
        • Manage S3 buckets using the GUI
        • Manage S3 buckets using the CLI
      • S3 users and authentication
        • Manage S3 users and authentication using the CLI
        • Manage S3 service accounts using the CLI
      • S3 rules information lifecycle management (ILM)
        • Manage S3 rules using the CLI
      • Audit S3 APIs
        • Configure audit webhook using the GUI
        • Configure audit webhook using the CLI
        • Example: How to use Splunk to audit S3
      • S3 supported APIs and limitations
      • S3 examples using boto3
  • Operation Guide
    • Alerts
      • Manage alerts using the GUI
      • Manage alerts using the CLI
      • List of alerts and corrective actions
    • Events
      • Manage events using the GUI
      • Manage events using the CLI
      • List of events
    • Statistics
      • Manage statistics using the GUI
      • Manage statistics using the CLI
      • List of statistics
    • System congestion
    • Security management
      • Obtain authentication tokens
      • KMS management
        • Manage KMS using the GUI
        • Manage KMS using the CLI
      • TLS certificate management
        • Manage the TLS certificate using the GUI
        • Manage the TLS certificate using the CLI
      • CA certificate management
        • Manage the CA certificate using the GUI
        • Manage the CA certificate using the CLI
      • Account lockout threshold policy management
        • Manage the account lockout threshold policy using GUI
        • Manage the account lockout threshold policy using CLI
      • Manage the login banner
        • Manage the login banner using the GUI
        • Manage the login banner using the CLI
    • User management
      • Manage users using the GUI
      • Manage users using the CLI
    • Organizations management
      • Manage organizations using the GUI
      • Manage organizations using the CLI
      • Mount authentication for organization filesystems
    • Expand and shrink cluster resources
      • Expand and shrink overview
      • Workflow: Add a backend host
      • Expansion of specific resources
      • Shrink a Cluster
    • Background tasks
    • Upgrade Weka versions
  • Billing & Licensing
    • License overview
    • Classic license
    • Pay-As-You-Go license
  • Support
    • Prerequisites and compatibility
    • Get support for your Weka system
    • Diagnostics management
      • Traces management
        • Manage traces using the GUI
        • Manage traces using the CLI
      • Protocols debug level management
        • Manage protocols debug level using the GUI
        • Manage protocols debug level using the CLI
      • Collect and upload diagnostics data
    • Weka Home - The Weka support cloud
      • Local Weka Home overview
      • Local Weka Home deployment
      • Set the Local Weka Home to send alerts or events
      • Download the Usage Report or Analytics
  • Appendix
    • Weka CSI Plugin
    • Set up the Weka-mon external monitoring
    • Set up the SnapTool external snapshots manager
  • REST API Reference Guide
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On this page
  • Manage background tasks
  • View running background tasks
  • ‌Limit background task resources
  • Pause/Resume/Abort a background task
  1. Operation Guide

Background tasks

This page describes the management of background tasks running on the Weka system.‌

‌The Weka system performs internal and external asynchronous operations and maintenance tasks in the background, allowing no interference nor starving the Weka system from serving IOs with high performance.‌

Background tasks include, for example, downloading and uploading snapshots and migrating an object store.

Adhere to the following:

  • CPU resource consumption: The Weka system limits these tasks’ CPU resources to 5% of the overall CPU. When the CPU is idle, background tasks can use more than the configured resources but are immediately freed if needed for serving IOs.

  • Concurrent tasks: The maximum number of concurrent tasks is 16, with restrictions such as:

    • Only a single local upload can exist inside a filesystem concurrently.

    • Only a single remote upload inside a filesystem concurrently (but local and remote uploads can co-exist).

    • Only a single upload from any filesystem can exist in the same object store bucket to prevent slowing down each other uploads.

    • Object store snapshot download operation cannot be run simultaneously with other snapshot download or upload operations.

Note: More restrictions exist between different tasks and multiple tasks of the same type. If a background task does not run due to a restriction, the system provides a relevant message.

Manage background tasks

View running background tasks

It is possible to view currently-running background tasks, including their status and progress.‌

Viewing background tasks using the CLI

‌Command: weka cluster task‌

This command is used for viewing all background tasks. For each task, a range of data can be displayed, as shown in the following example:

# weka cluster task
Type       | State   | Progress | Description
-----------+---------+----------+-----------------------------------------------------------
OBS_DETACH | RUNNING | 94       | Detaching Object Storage `obs_1` from filesystem `default`

‌Limit background task resources

It is possible to limit the resources being used by background tasks.

Limit background tasks using the CLI

Command: weka cluster task limits

This command is used to view the defined limits.

Command: weka cluster task limits set [--cpu-limit cpu-limit]

This command is used to update the CPU limit.

Pause/Resume/Abort a background task

It is possible to pause and later resume a background task, as well as completely abort it. This is useful in case there are other tasks/activities that are of higher priority.

Pause/Resume/Abort a background task using the CLI

Command: weka cluster task pause / resume / abort <task-id>

This command is used to pause/resume/abort the running of a specific task.

Note: Up to 16 background tasks can run in parallel. A paused (or aborting) task still consumes one of these spots.

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Last updated 2 years ago