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3 Commits
Author SHA1 Message Date
Ping QiuandClaude Opus 4.6 98d0e9e631 feat: Phase 5 CP5-1 -- ALUA + multipath failover, 28 tests 
Add ALUA (Asymmetric Logical Unit Access) support to the iSCSI target,
enabling dm-multipath on Linux to automatically detect path state changes
and reroute I/O during HA failover without initiator-side intervention.

- ALUAProvider interface with implicit ALUA (TPGS=0x01)
- INQUIRY byte 5 TPGS bits, VPD 0x83 with NAA+TPG+RTP descriptors
- REPORT TARGET PORT GROUPS handler (MAINTENANCE IN SA=0x0A)
- MAINTENANCE OUT rejection (implicit-only, no SET TPG)
- Standby write rejection (NOT_READY ASC=04h ASCQ=0Bh)
- RoleNone maps to Active/Optimized (standalone single-node compatibility)
- NAA-6 device identifier derived from volume UUID
- -tpg-id flag with [1,65535] validation
- dm-multipath config + setup script (group_by_tpg, ALUA prio)
- 12 unit tests + 16 QA adversarial tests + 4 integration tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 2026-03-02 23:29:58 -08:00
Ping QiuandClaude Opus 4.6 7940e6b7c9 feat: Phase 4A CP4b-4 Windows iSCSI + instrumentation + QA tests 
Windows iSCSI Initiator compatibility:
- Add TargetPortalGroupTag to login response (RFC 7143 S13.9)
- Add REQUEST_SENSE, START_STOP_UNIT, MODE_SELECT(6/10) handlers
- Add PERSISTENT_RESERVE_IN/OUT, MAINTENANCE_IN (REPORT SUPPORTED OPCODES)
- Implement MODE SENSE caching (page 0x08) and control (page 0x0A) pages
- Fix Data-In residual underflow/overflow flags (U/O bits on final PDU)
- Rename ScsiReadCapacity16 -> ScsiServiceActionIn16 for correctness

Instrumentation and tooling:
- Add instrumentedAdapter with periodic PERF stats logging
- Add pprof endpoints on admin HTTP server (/debug/pprof/*)
- Add blockbench CLI tool for standalone block device benchmarking
- Add SCSI CDB debug logging in session dispatch

HA integration fixes:
- Move HA test replica ports to 9011-9014 to avoid conflicts
- Add QA adversarial tests for Phase 4A CP4b-4 (755 lines)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 2026-03-02 21:17:57 -08:00
Ping QiuandClaude Opus 4.6 c39080ceaa feat: Phase 4A CP4b-4 -- HA integration tests, admin HTTP, 5 bug fixes 
Add HTTP admin server to iscsi-target binary (POST /assign, GET /status,
POST /replica, POST /rebuild) and 7 HA integration tests validating
failover, split-brain prevention, epoch fencing, and demote-under-IO.

New files:
- admin.go: HTTP admin endpoint with input validation
- ha_target.go: HATarget helper wrapping Target + admin HTTP calls
- ha_test.go: 7 HA tests (all PASS on WSL2, 67.7s total)

Bug fixes:
- BUG-CP4B4-1: CmdSN init (expCmdSN=0 not 1, first SCSI cmd was dropped)
- BUG-CP4B4-2: RoleNone->RoleReplica missing SetEpoch (WAL rejected)
- BUG-CP4B4-3: replica applyEntry didn't update vol.nextLSN (status=0)
- BUG-CP4B4-4: PID discovery killed primary instead of replica (shared
  binPath; fixed by grepping volFile)
- BUG-CP4B4-5: artifact collector overwrote primary log with replica log
  (added CollectLabeled method)

Also: 3s write deadline on WAL shipper data connection to avoid 120s TCP
retransmission timeout when replica is dead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 2026-03-02 15:04:59 -08:00