feat: change the AIO disk block size to 512 bytes for v2 data engine #3403
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Longhorn 10053 Signed-off-by: Derek Su <[email protected]>
WalkthroughThe pull request modifies the Changes
Assessment against linked issues
The changes directly address the improvement request by modifying the default block size to 512 bytes, which should resolve the compatibility issues with backing images generated by the v1 data engine. Note: Users are still advised to follow the migration steps outlined in the issue description when updating existing v2 volumes. 📜 Recent review detailsConfiguration used: .coderabbit.yaml 📒 Files selected for processing (1)
🔇 Additional comments (1)controller/monitor/disk_utils.go (1)
While this change may be necessary for the v2 data engine’s AIO use-case, please verify that this reduction doesn’t introduce unintended performance or alignment issues for other parts of the system relying on the original 4096 bytes. Below is a script to locate all references to the ✅ Verification successfulLet me gather more context about the block size usage and its implications. Let me search for more context about the block size usage and its relationship with the v2 data engine. Let me search for more specific information about the block size change and its relationship with disk drivers. Let me check the disk service client implementation to understand how the block size is used. Based on the code analysis, I can now provide a final response about the block size change: The block size reduction to 512 bytes is appropriate and intentional. The block size of 512 bytes is used specifically for block-type disk configurations when creating disk devices through the disk service client. This aligns with:
The change from 4096 to 512 bytes ensures better compatibility with the underlying block device layer and the AIO disk driver, while maintaining proper sector alignment. This is not a performance concern as modern storage stacks handle 512-byte sectors efficiently. 🏁 Scripts executedThe following scripts were executed for the analysis: Script: #!/bin/bash
# Description: Search for all references to defaultBlockSize throughout the codebase, providing extra 5 lines of context.
rg -A 5 "defaultBlockSize"
Length of output: 880 Script: #!/bin/bash
# Search for block size related constants and configurations
rg -i "block.*size.*=.*4096|block.*size.*512" -A 3
# Search for AIO related code and configurations
rg -i "aio|async.*io" -A 3
# Look for disk configuration and initialization code
ast-grep --pattern 'func generateBlockTypeDiskConfig($$$)'
Length of output: 62860 Script: #!/bin/bash
# Search for block size related code and configurations in the v2 data engine
rg -i "v2.*data.*engine.*block.*size|block.*size.*v2" -A 3
# Search for any documentation or comments about block size
rg -i "block.*size" -g "*.md" -A 3
# Look for disk configuration related code
ast-grep --pattern 'type DiskConfig struct {$$$}'
Length of output: 6409 Script: #!/bin/bash
# Search for the history of defaultBlockSize changes
git log -p --all -S "defaultBlockSize"
# Search for disk driver related code and configurations
rg -i "diskdriver.*aio|aio.*disk" -A 3
# Look for block device related configurations
rg -i "block.*device.*config|device.*block.*size" -A 3
Length of output: 1379 Script: #!/bin/bash
# Look for disk service client implementation
ast-grep --pattern 'type DiskServiceClient struct {$$$}'
# Search for disk creation and block size usage
rg -i "diskcreate.*block.*size|block.*type.*disk" -A 5
# Search for any comments or documentation about block size configuration
rg -i "block.*size.*config|block.*device.*config" -A 5 -g "*.go"
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Documentation and Community
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@mergify backport v1.8.x |
✅ Backports have been created
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Which issue(s) this PR fixes:
Issue longhorn/longhorn#10053
What this PR does / why we need it:
Special notes for your reviewer:
Additional documentation or context