firecracker-microvm/firecracker

Unmap/discard/fstrim

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#2,708 opened on Aug 24, 2021

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 (12 comments) (5 reactions) (0 assignees)Rust (2,393 forks)batch import
Good first issuePriority: MediumRoadmap: New RequestStatus: Parked

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Description

Is firecracker supporting unmap/discard/fstrim, ie automatic reduction of the image size on the host when a file is deleted on the guest? If it does how do I enable it?

Contributor guide

Research direction
Investigate if Firecracker's virtio blk device supports the discard command (command 13) and if guest kernel configuration enables fstrim. Check the source code for block device handling and look for any existing configuration options or open PRs regarding trim support.
Tech stack
rust
Domain
backendinfrastructurecloud
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
LinuxStorage fundamentals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65