PowerStore: Trickle Write Mode

Samenvatting: Trickle Write mode is introduced with PowerStoreOS 4.0. It is intended to preserve drives, avoid scenarios where multiple drives fail simultaneously, and force proactive drive replacement. ...

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Instructies

Trickle Write mode

The DataPath in PowerStore is designed to wear drives evenly. As an appliance ages, it is likely for multiple drives to wear out around the same time.

PowerStore Data Protection controls the rebuild process when drives are replaced. If multiple drives fail simultaneously, rebuild cannot work correctly and data loss can occur. 

Trickle Write mode:
    • Disables background services, such as space reclamation
    • Stops I/O to all drives
    • Transitions NAS to read-only mode
    • Triggers a red banner in PowerStore Manager and generates critical alerts

A system is placed in Trickle Write mode when the fault tolerance plus one drive reaches 99% worn.

For example:

  • Clusters set to Single Drive Failure enter Trickle Write mode when two or more drives reach End of Life.
  • Clusters set to Double Drive Failure enter Trickle Write mode when three or more drives reach End of Life.


Tip: PowerStore Manager calls the feature a guardrail, while the service command references wear_trickle_write.

Complete the recovery process (svc_wear_trickle_write)

This service script enables you to complete the manual recovery process once the system enters wear trickle write mode.

Usage

Function System Operations
Mode Service
Usage Service
Requires service user password? Yes
Requires root privileges? Yes
May cause data unavailability? Yes
May cause data loss? No
Scope Node
Prerequisites None
 

Format

svc_wear_trickle_write [-h] {exit_trickle,enable_policy,show_drives,list_policy}

Optional arguments

QUALIFIER   DESCRIPTION
-h, --help Show the help message and exit.      

Actions

ACTION DESCRIPTION
exit_trickle Manually exit wear trickle write mode. Use this command after the recovery procedure is complete. If you want to continue using the worn-out drives and exit trickle write mode, you must disable the exit trickle write policy before using this command.
enable_policy   Enable wear the trickle-write policy. The wear trickle-write policy is enabled by default.
show_drives List all worn-out SSD drives in the system.
list_policy Get the current wear trickle-write policy setting.
disable_policy Disable the wear trickle-write policy.

Dell PowerStore Service Scripts Guide
https://dl.dell.com/content/manual61302475-dell-powerstore-service-scripts-guide.pdf?language=en-us

Getroffen producten

PowerStore, PowerStore 1000T, PowerStore 1200T, PowerStore 3000T, PowerStore 3200T, PowerStore 5000T, PowerStore 500T, PowerStore 9000T, PowerStore 9200T
Artikeleigenschappen
Artikelnummer: 000226721
Artikeltype: How To
Laatst aangepast: 09 jul. 2024
Versie:  1
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