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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  • Overview
  • System congestion events/alerts
  1. Operation Guide

System congestion

This page describes possible congestion issues in the Weka system.

PreviousList of statisticsNextSecurity management

Last updated 3 years ago

Overview

The Weka system is built to be very efficient, provide maximum performance and saturate the network links.

In some situations, the system itself may slow down IOs when reaching some limits (or even block new IOs at higher limits) until the congested resource is relieved. Such situations may be transient and the issue will be resolved on its own after a short time. However, there are also cases that suggest an issue that needs to be addressed, such as a workload maxing out the resources of the cluster. In such cases, the cluster resources must be expanded, as described in . Contact the Weka Support Team for more information on this.

System congestion events/alerts

The Weka system can issue several types of congestion events/alerts:

Type

Description

Actions

FIBERS

Extreme load of concurrent system operations on a node

This is usually a transient situation due to load on them system. If the load is consistent and the problem persists, add more resources (hosts/cores), as described in or .

DESTAGER

Too many pending IOs are waiting to be written for a specific node

This is usually a transient situation due to load on them system. If the load is consistent and the problem persists, add more hosts to the cluster as described in , or expand the host resources as described in .

SSD

Too many pending IOs to the SSD

If there is a single SSD, it is probably faulty and needs to be replaced. If there are multiple SSDs, the load on the system is too high. To handle such a load, more SSDs should be added to the system, as described in .

RAID_NOT_OK

More IO failures than can be handled have occurred, and IOs cannot be served

Make sure to bring up any host that might be down. If all hosts are up, contact the Weka Support Team.

XDESTAGE

Auxiliary cluster resources are low

This is usually a transient situation due to load on the system. If the load is consistent and the problem persists, add more hosts to the cluster as described in , or consult the Weka Support Team.

Expanding & Shrinking Cluster Resources
Adding a Backend Host
Adding a Backend Host
Expansion of Specific Resources
Adding a Backend Host
Addition of CPU cores
Expansion of Specific Resources