* fix: EC rebalance fails with replica placement 000
This PR fixes several issues with EC shard distribution:
1. Pre-flight check before EC encoding
- Verify target disk type has capacity before encoding starts
- Prevents encoding shards only to fail during rebalance
- Shows helpful error when wrong diskType is specified (e.g., ssd when volumes are on hdd)
2. Fix EC rebalance with replica placement 000
- When DiffRackCount=0, shards should be distributed freely across racks
- The '000' placement means 'no volume replication needed' because EC provides redundancy
- Previously all racks were skipped with error 'shards X > replica placement limit (0)'
3. Add unit tests for EC rebalance slot calculation
- TestECRebalanceWithLimitedSlots: documents the limited slots scenario
- TestECRebalanceZeroFreeSlots: reproduces the 0 free slots error
4. Add Makefile for manual EC testing
- make setup: start cluster and populate data
- make shell: open weed shell for EC commands
- make clean: stop cluster and cleanup
* fix: default -rebalance to true for ec.encode
The -rebalance flag was defaulting to false, which meant ec.encode would
only print shard moves but not actually execute them. This is a poor
default since the whole point of EC encoding is to distribute shards
across servers for fault tolerance.
Now -rebalance defaults to true, so shards are actually distributed
after encoding. Users can use -rebalance=false if they only want to
see what would happen without making changes.
* test/erasure_coding: improve Makefile safety and docs
- Narrow pkill pattern for volume servers to use TEST_DIR instead of
port pattern, avoiding accidental kills of unrelated SeaweedFS processes
- Document external dependencies (curl, jq) in header comments
* shell: refactor buildRackWithEcShards to reuse buildEcShards
Extract common shard bit construction logic to avoid duplication
between buildEcShards and buildRackWithEcShards helper functions.
* shell: update test for EC replication 000 behavior
When DiffRackCount=0 (replication "000"), EC shards should be
distributed freely across racks since erasure coding provides its
own redundancy. Update test expectation to reflect this behavior.
* erasure_coding: add distribution package for proportional EC shard placement
Add a new reusable package for EC shard distribution that:
- Supports configurable EC ratios (not hard-coded 10+4)
- Distributes shards proportionally based on replication policy
- Provides fault tolerance analysis
- Prefers moving parity shards to keep data shards spread out
Key components:
- ECConfig: Configurable data/parity shard counts
- ReplicationConfig: Parsed XYZ replication policy
- ECDistribution: Target shard counts per DC/rack/node
- Rebalancer: Plans shard moves with parity-first strategy
This enables seaweed-enterprise custom EC ratios and weed worker
integration while maintaining a clean, testable architecture.
* shell: integrate distribution package for EC rebalancing
Add shell wrappers around the distribution package:
- ProportionalECRebalancer: Plans moves using distribution.Rebalancer
- NewProportionalECRebalancerWithConfig: Supports custom EC configs
- GetDistributionSummary/GetFaultToleranceAnalysis: Helper functions
The shell layer converts between EcNode types and the generic
TopologyNode types used by the distribution package.
* test setup
* ec: improve data and parity shard distribution across racks
- Add shardsByTypePerRack helper to track data vs parity shards
- Rewrite doBalanceEcShardsAcrossRacks for two-pass balancing:
1. Balance data shards (0-9) evenly, max ceil(10/6)=2 per rack
2. Balance parity shards (10-13) evenly, max ceil(4/6)=1 per rack
- Add balanceShardTypeAcrossRacks for generic shard type balancing
- Add pickRackForShardType to select destination with room for type
- Add unit tests for even data/parity distribution verification
This ensures even read load during normal operation by spreading
both data and parity shards across all available racks.
* ec: make data/parity shard counts configurable in ecBalancer
- Add dataShardCount and parityShardCount fields to ecBalancer struct
- Add getDataShardCount() and getParityShardCount() methods with defaults
- Replace direct constant usage with configurable methods
- Fix unused variable warning for parityPerRack
This allows seaweed-enterprise to use custom EC ratios while
defaulting to standard 10+4 scheme.
* Address PR 7812 review comments
Makefile improvements:
- Save PIDs for each volume server for precise termination
- Use PID-based killing in stop target with pkill fallback
- Use more specific pkill patterns with TEST_DIR paths
Documentation:
- Document jq dependency in README.md
Rebalancer fix:
- Fix duplicate shard count updates in applyMovesToAnalysis
- All planners (DC/rack/node) update counts inline during planning
- Remove duplicate updates from applyMovesToAnalysis to avoid double-counting
* test/erasure_coding: use mktemp for test file template
Use mktemp instead of hardcoded /tmp/testfile_template.bin path
to provide better isolation for concurrent test runs.
* fix: sync EC volume files before copying to fix deleted needles not being marked when decoding (#7751)
When a file is deleted from an EC volume, the deletion is written to both
the .ecx and .ecj files. However, these writes were not synced to disk
before the files were copied during ec.decode. This caused the copied
files to miss the deletion markers, resulting in 'leaked' space where
deleted files were not properly tracked after decoding.
This fix:
1. Adds a Sync() method to EcVolume that flushes .ecx and .ecj files
to disk without closing them
2. Calls Sync() in CopyFile before copying EC volume files to ensure
all deletions are visible to the copy operation
Fixes#7751
* test: add integration tests for EC volume deletion sync (issue #7751)
Add comprehensive tests to verify that deleted needles are properly
visible after EcVolume.Sync() is called. These tests cover:
1. TestWriteIdxFileFromEcIndex_PreservesDeletedNeedles
- Verifies that WriteIdxFileFromEcIndex preserves deletion markers
from .ecx files when generating .idx files
2. TestWriteIdxFileFromEcIndex_ProcessesEcjJournal
- Verifies that deletions from .ecj journal file are correctly
appended to the generated .idx file
3. TestEcxFileDeletionVisibleAfterSync
- Verifies that MarkNeedleDeleted changes are visible after Sync()
4. TestEcxFileDeletionWithSeparateHandles
- Tests that synced changes are visible across separate file handles
5. TestEcVolumeSyncEnsuresDeletionsVisible
- Integration test for the full EcVolume.DeleteNeedleFromEcx +
Sync() workflow that validates the fix for issue #7751
* refactor: log sync errors in EcVolume.Sync() instead of ignoring them
Per code review feedback: sync errors could reintroduce the bug this PR
fixes, so logging warnings helps with debugging.
* fix(ec.decode): purge EC shards when volume is empty
When an EC volume has no live entries (all deleted), ec.decode should not generate an empty normal volume. Instead, treat decode as a no-op and allow shard purge to proceed cleanly.\n\nFixes: #7748
* chore: address PR review comments
* test: cover live EC index + avoid magic string
* chore: harden empty-EC handling
- Make shard cleanup best-effort (collect errors)\n- Remove unreachable EOF handling in HasLiveNeedles\n- Add empty ecx test case\n- Share no-live-entries substring between server/client\n
* perf: parallelize EC shard unmount/delete across locations
* refactor: combine unmount+delete into single goroutine per location
* refactor: use errors.Join for multi-error aggregation
* refactor: use existing ErrorWaitGroup for parallel execution
* fix: capture loop variables + clarify SuperBlockSize safety
* Add placement package for EC shard placement logic
- Consolidate EC shard placement algorithm for reuse across shell and worker tasks
- Support multi-pass selection: racks, then servers, then disks
- Include proper spread verification and scoring functions
- Comprehensive test coverage for various cluster topologies
* Make ec.balance disk-aware for multi-disk servers
- Add EcDisk struct to track individual disks on volume servers
- Update EcNode to maintain per-disk shard distribution
- Parse disk_id from EC shard information during topology collection
- Implement pickBestDiskOnNode() for selecting best disk per shard
- Add diskDistributionScore() for tie-breaking node selection
- Update all move operations to specify target disk in RPC calls
- Improves shard balance within multi-disk servers, not just across servers
* Use placement package in EC detection for consistent disk-level placement
- Replace custom EC disk selection logic with shared placement package
- Convert topology DiskInfo to placement.DiskCandidate format
- Use SelectDestinations() for multi-rack/server/disk spreading
- Convert placement results back to topology DiskInfo for task creation
- Ensures EC detection uses same placement logic as shell commands
* Make volume server evacuation disk-aware
- Use pickBestDiskOnNode() when selecting evacuation target disk
- Specify target disk in evacuation RPC requests
- Maintains balanced disk distribution during server evacuations
* Rename PlacementConfig to PlacementRequest for clarity
PlacementRequest better reflects that this is a request for placement
rather than a configuration object. This improves API semantics.
* Rename DefaultConfig to DefaultPlacementRequest
Aligns with the PlacementRequest type naming for consistency
* Address review comments from Gemini and CodeRabbit
Fix HIGH issues:
- Fix empty disk discovery: Now discovers all disks from VolumeInfos,
not just from EC shards. This ensures disks without EC shards are
still considered for placement.
- Fix EC shard count calculation in detection.go: Now correctly filters
by DiskId and sums actual shard counts using ShardBits.ShardIdCount()
instead of just counting EcShardInfo entries.
Fix MEDIUM issues:
- Add disk ID to evacuation log messages for consistency with other logging
- Remove unused serverToDisks variable in placement.go
- Fix comment that incorrectly said 'ascending' when sorting is 'descending'
* add ec tests
* Update ec-integration-tests.yml
* Update ec_integration_test.go
* Fix EC integration tests CI: build weed binary and update actions
- Add 'Build weed binary' step before running tests
- Update actions/setup-go from v4 to v6 (Node20 compatibility)
- Update actions/checkout from v2 to v4 (Node20 compatibility)
- Move working-directory to test step only
* Add disk-aware EC rebalancing integration tests
- Add TestDiskAwareECRebalancing test with multi-disk cluster setup
- Test EC encode with disk awareness (shows disk ID in output)
- Test EC balance with disk-level shard distribution
- Add helper functions for disk-level verification:
- startMultiDiskCluster: 3 servers x 4 disks each
- countShardsPerDisk: track shards per disk per server
- calculateDiskShardVariance: measure distribution balance
- Verify no single disk is overloaded with shards
* refactor: add ECContext structure to encapsulate EC parameters
- Create ec_context.go with ECContext struct
- NewDefaultECContext() creates context with default 10+4 configuration
- Helper methods: CreateEncoder(), ToExt(), String()
- Foundation for cleaner function signatures
- No behavior change, still uses hardcoded 10+4
* refactor: update ec_encoder.go to use ECContext
- Add WriteEcFilesWithContext() and RebuildEcFilesWithContext() functions
- Keep old functions for backward compatibility (call new versions)
- Update all internal functions to accept ECContext parameter
- Use ctx.DataShards, ctx.ParityShards, ctx.TotalShards consistently
- Use ctx.CreateEncoder() instead of hardcoded reedsolomon.New()
- Use ctx.ToExt() for shard file extensions
- No behavior change, still uses default 10+4 configuration
* refactor: update ec_volume.go to use ECContext
- Add ECContext field to EcVolume struct
- Initialize ECContext with default configuration in NewEcVolume()
- Update LocateEcShardNeedleInterval() to use ECContext.DataShards
- Phase 1: Always uses default 10+4 configuration
- No behavior change
* refactor: add EC shard count fields to VolumeInfo protobuf
- Add data_shards_count field (field 8) to VolumeInfo message
- Add parity_shards_count field (field 9) to VolumeInfo message
- Fields are optional, 0 means use default (10+4)
- Backward compatible: fields added at end
- Phase 1: Foundation for future customization
* refactor: regenerate protobuf Go files with EC shard count fields
- Regenerated volume_server_pb/*.go with new EC fields
- DataShardsCount and ParityShardsCount accessors added to VolumeInfo
- No behavior change, fields not yet used
* refactor: update VolumeEcShardsGenerate to use ECContext
- Create ECContext with default configuration in VolumeEcShardsGenerate
- Use ecCtx.TotalShards and ecCtx.ToExt() in cleanup
- Call WriteEcFilesWithContext() instead of WriteEcFiles()
- Save EC configuration (DataShardsCount, ParityShardsCount) to VolumeInfo
- Log EC context being used
- Phase 1: Always uses default 10+4 configuration
- No behavior change
* fmt
* refactor: update ec_test.go to use ECContext
- Update TestEncodingDecoding to create and use ECContext
- Update validateFiles() to accept ECContext parameter
- Update removeGeneratedFiles() to use ctx.TotalShards and ctx.ToExt()
- Test passes with default 10+4 configuration
* refactor: use EcShardConfig message instead of separate fields
* optimize: pre-calculate row sizes in EC encoding loop
* refactor: replace TotalShards field with Total() method
- Remove TotalShards field from ECContext to avoid field drift
- Add Total() method that computes DataShards + ParityShards
- Update all references to use ctx.Total() instead of ctx.TotalShards
- Read EC config from VolumeInfo when loading EC volumes
- Read data shard count from .vif in VolumeEcShardsToVolume
- Use >= instead of > for exact boundary handling in encoding loops
* optimize: simplify VolumeEcShardsToVolume to use existing EC context
- Remove redundant CollectEcShards call
- Remove redundant .vif file loading
- Use v.ECContext.DataShards directly (already loaded by NewEcVolume)
- Slice tempShards instead of collecting again
* refactor: rename MaxShardId to MaxShardCount for clarity
- Change from MaxShardId=31 to MaxShardCount=32
- Eliminates confusing +1 arithmetic (MaxShardId+1)
- More intuitive: MaxShardCount directly represents the limit
fix: support custom EC ratios beyond 14 shards in VolumeEcShardsToVolume
- Add MaxShardId constant (31, since ShardBits is uint32)
- Use MaxShardId+1 (32) instead of TotalShardsCount (14) for tempShards buffer
- Prevents panic when slicing for volumes with >14 total shards
- Critical fix for custom EC configurations like 20+10
* fix: add validation for EC shard counts from VolumeInfo
- Validate DataShards/ParityShards are positive and within MaxShardCount
- Prevent zero or invalid values that could cause divide-by-zero
- Fallback to defaults if validation fails, with warning log
- VolumeEcShardsGenerate now preserves existing EC config when regenerating
- Critical safety fix for corrupted or legacy .vif files
* fix: RebuildEcFiles now loads EC config from .vif file
- Critical: RebuildEcFiles was always using default 10+4 config
- Now loads actual EC config from .vif file when rebuilding shards
- Validates config before use (positive shards, within MaxShardCount)
- Falls back to default if .vif missing or invalid
- Prevents data corruption when rebuilding custom EC volumes
* add: defensive validation for dataShards in VolumeEcShardsToVolume
- Validate dataShards > 0 and <= MaxShardCount before use
- Prevents panic from corrupted or uninitialized ECContext
- Returns clear error message instead of panic
- Defense-in-depth: validates even though upstream should catch issues
* fix: replace TotalShardsCount with MaxShardCount for custom EC ratio support
Critical fixes to support custom EC ratios > 14 shards:
disk_location_ec.go:
- validateEcVolume: Check shards 0-31 instead of 0-13 during validation
- removeEcVolumeFiles: Remove shards 0-31 instead of 0-13 during cleanup
ec_volume_info.go ShardBits methods:
- ShardIds(): Iterate up to MaxShardCount (32) instead of TotalShardsCount (14)
- ToUint32Slice(): Iterate up to MaxShardCount (32)
- IndexToShardId(): Iterate up to MaxShardCount (32)
- MinusParityShards(): Remove shards 10-31 instead of 10-13 (added note about Phase 2)
- Minus() shard size copy: Iterate up to MaxShardCount (32)
- resizeShardSizes(): Iterate up to MaxShardCount (32)
Without these changes:
- Custom EC ratios > 14 total shards would fail validation on startup
- Shards 14-31 would never be discovered or cleaned up
- ShardBits operations would miss shards >= 14
These changes are backward compatible - MaxShardCount (32) includes
the default TotalShardsCount (14), so existing 10+4 volumes work as before.
* fix: replace TotalShardsCount with MaxShardCount in critical data structures
Critical fixes for buffer allocations and loops that must support
custom EC ratios up to 32 shards:
Data Structures:
- store_ec.go:354: Buffer allocation for shard recovery (bufs array)
- topology_ec.go:14: EcShardLocations.Locations fixed array size
- command_ec_rebuild.go:268: EC shard map allocation
- command_ec_common.go:626: Shard-to-locations map allocation
Shard Discovery Loops:
- ec_task.go:378: Loop to find generated shard files
- ec_shard_management.go: All 8 loops that check/count EC shards
These changes are critical because:
1. Buffer allocations sized to 14 would cause index-out-of-bounds panics
when accessing shards 14-31
2. Fixed arrays sized to 14 would truncate shard location data
3. Loops limited to 0-13 would never discover/manage shards 14-31
Note: command_ec_encode.go:208 intentionally NOT changed - it creates
shard IDs to mount after encoding. In Phase 1 we always generate 14
shards, so this remains TotalShardsCount and will be made dynamic in
Phase 2 based on actual EC context.
Without these fixes, custom EC ratios > 14 total shards would cause:
- Runtime panics (array index out of bounds)
- Data loss (shards 14-31 never discovered/tracked)
- Incomplete shard management (missing shards not detected)
* refactor: move MaxShardCount constant to ec_encoder.go
Moved MaxShardCount from ec_volume_info.go to ec_encoder.go to group it
with other shard count constants (DataShardsCount, ParityShardsCount,
TotalShardsCount). This improves code organization and makes it easier
to understand the relationship between these constants.
Location: ec_encoder.go line 22, between TotalShardsCount and MinTotalDisks
* improve: add defensive programming and better error messages for EC
Code review improvements from CodeRabbit:
1. ShardBits Guardrails (ec_volume_info.go):
- AddShardId, RemoveShardId: Reject shard IDs >= MaxShardCount
- HasShardId: Return false for out-of-range shard IDs
- Prevents silent no-ops from bit shifts with invalid IDs
2. Future-Proof Regex (disk_location_ec.go):
- Updated regex from \.ec[0-9][0-9] to \.ec\d{2,3}
- Now matches .ec00 through .ec999 (currently .ec00-.ec31 used)
- Supports future increases to MaxShardCount beyond 99
3. Better Error Messages (volume_grpc_erasure_coding.go):
- Include valid range (1..32) in dataShards validation error
- Helps operators quickly identify the problem
4. Validation Before Save (volume_grpc_erasure_coding.go):
- Validate ECContext (DataShards > 0, ParityShards > 0, Total <= MaxShardCount)
- Log EC config being saved to .vif for debugging
- Prevents writing invalid configs to disk
These changes improve robustness and debuggability without changing
core functionality.
* fmt
* fix: critical bugs from code review + clean up comments
Critical bug fixes:
1. command_ec_rebuild.go: Fixed indentation causing compilation error
- Properly nested if/for blocks in registerEcNode
2. ec_shard_management.go: Fixed isComplete logic incorrectly using MaxShardCount
- Changed from MaxShardCount (32) back to TotalShardsCount (14)
- Default 10+4 volumes were being incorrectly reported as incomplete
- Missing shards 14-31 were being incorrectly reported as missing
- Fixed in 4 locations: volume completeness checks and getMissingShards
3. ec_volume_info.go: Fixed MinusParityShards removing too many shards
- Changed from MaxShardCount (32) back to TotalShardsCount (14)
- Was incorrectly removing shard IDs 10-31 instead of just 10-13
Comment cleanup:
- Removed Phase 1/Phase 2 references (development plan context)
- Replaced with clear statements about default 10+4 configuration
- SeaweedFS repo uses fixed 10+4 EC ratio, no phases needed
Root cause: Over-aggressive replacement of TotalShardsCount with MaxShardCount.
MaxShardCount (32) is the limit for buffer allocations and shard ID loops,
but TotalShardsCount (14) must be used for default EC configuration logic.
* fix: add defensive bounds checks and compute actual shard counts
Critical fixes from code review:
1. topology_ec.go: Add defensive bounds checks to AddShard/DeleteShard
- Prevent panic when shardId >= MaxShardCount (32)
- Return false instead of crashing on out-of-range shard IDs
2. command_ec_common.go: Fix doBalanceEcShardsAcrossRacks
- Was using hardcoded TotalShardsCount (14) for all volumes
- Now computes actual totalShardsForVolume from rackToShardCount
- Fixes incorrect rebalancing for volumes with custom EC ratios
- Example: 5+2=7 shards would incorrectly use 14 as average
These fixes improve robustness and prepare for future custom EC ratios
without changing current behavior for default 10+4 volumes.
Note: MinusParityShards and ec_task.go intentionally NOT changed for
seaweedfs repo - these will be enhanced in seaweed-enterprise repo
where custom EC ratio configuration is added.
* fmt
* style: make MaxShardCount type casting explicit in loops
Improved code clarity by explicitly casting MaxShardCount to the
appropriate type when used in loop comparisons:
- ShardId comparisons: Cast to ShardId(MaxShardCount)
- uint32 comparisons: Cast to uint32(MaxShardCount)
Changed in 5 locations:
- Minus() loop (line 90)
- ShardIds() loop (line 143)
- ToUint32Slice() loop (line 152)
- IndexToShardId() loop (line 219)
- resizeShardSizes() loop (line 248)
This makes the intent explicit and improves type safety readability.
No functional changes - purely a style improvement.
* initial design
* added simulation as tests
* reorganized the codebase to move the simulation framework and tests into their own dedicated package
* integration test. ec worker task
* remove "enhanced" reference
* start master, volume servers, filer
Current Status
✅ Master: Healthy and running (port 9333)
✅ Filer: Healthy and running (port 8888)
✅ Volume Servers: All 6 servers running (ports 8080-8085)
🔄 Admin/Workers: Will start when dependencies are ready
* generate write load
* tasks are assigned
* admin start wtih grpc port. worker has its own working directory
* Update .gitignore
* working worker and admin. Task detection is not working yet.
* compiles, detection uses volumeSizeLimitMB from master
* compiles
* worker retries connecting to admin
* build and restart
* rendering pending tasks
* skip task ID column
* sticky worker id
* test canScheduleTaskNow
* worker reconnect to admin
* clean up logs
* worker register itself first
* worker can run ec work and report status
but:
1. one volume should not be repeatedly worked on.
2. ec shards needs to be distributed and source data should be deleted.
* move ec task logic
* listing ec shards
* local copy, ec. Need to distribute.
* ec is mostly working now
* distribution of ec shards needs improvement
* need configuration to enable ec
* show ec volumes
* interval field UI component
* rename
* integration test with vauuming
* garbage percentage threshold
* fix warning
* display ec shard sizes
* fix ec volumes list
* Update ui.go
* show default values
* ensure correct default value
* MaintenanceConfig use ConfigField
* use schema defined defaults
* config
* reduce duplication
* refactor to use BaseUIProvider
* each task register its schema
* checkECEncodingCandidate use ecDetector
* use vacuumDetector
* use volumeSizeLimitMB
* remove
remove
* remove unused
* refactor
* use new framework
* remove v2 reference
* refactor
* left menu can scroll now
* The maintenance manager was not being initialized when no data directory was configured for persistent storage.
* saving config
* Update task_config_schema_templ.go
* enable/disable tasks
* protobuf encoded task configurations
* fix system settings
* use ui component
* remove logs
* interface{} Reduction
* reduce interface{}
* reduce interface{}
* avoid from/to map
* reduce interface{}
* refactor
* keep it DRY
* added logging
* debug messages
* debug level
* debug
* show the log caller line
* use configured task policy
* log level
* handle admin heartbeat response
* Update worker.go
* fix EC rack and dc count
* Report task status to admin server
* fix task logging, simplify interface checking, use erasure_coding constants
* factor in empty volume server during task planning
* volume.list adds disk id
* track disk id also
* fix locking scheduled and manual scanning
* add active topology
* simplify task detector
* ec task completed, but shards are not showing up
* implement ec in ec_typed.go
* adjust log level
* dedup
* implementing ec copying shards and only ecx files
* use disk id when distributing ec shards
🎯 Planning: ActiveTopology creates DestinationPlan with specific TargetDisk
📦 Task Creation: maintenance_integration.go creates ECDestination with DiskId
🚀 Task Execution: EC task passes DiskId in VolumeEcShardsCopyRequest
💾 Volume Server: Receives disk_id and stores shards on specific disk (vs.store.Locations[req.DiskId])
📂 File System: EC shards and metadata land in the exact disk directory planned
* Delete original volume from all locations
* clean up existing shard locations
* local encoding and distributing
* Update docker/admin_integration/EC-TESTING-README.md
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
* check volume id range
* simplify
* fix tests
* fix types
* clean up logs and tests
---------
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
NeedleHeaderSize happen to have the same size as NeedleMapEntrySize, except when running the 5 bytes offset variant of Seaweedfs, because it does not contain OffsetSize. This causes ECX corruption on deletes, due to the drifting offset computation (offset is always computed on a basis of 16 bytes per record instead of 17 bytes)
Signed-off-by: Quentin Devos <4972091+Okhoshi@users.noreply.github.com>