refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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+---
+id: wiki-2026-0508-storage-area-networks
+title: Storage Area Networks
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [SAN, Storage Area Network, Fibre Channel SAN]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.85
+verification_status: applied
+tags: [infrastructure, storage, san, fibre-channel, nvme-of]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: bash
+  framework: linux-storage
+---
+
+# Storage Area Networks (SAN)
+
+## 매 한 줄
+> **"매 dedicated network 의 block-level storage — 매 servers 의 shared disk pool 의 access (LUN as local disk)"**. Fibre Channel (FC), iSCSI, NVMe-oF (over Fabrics) 의 protocol. 매 NAS (file-level) 와 대비. 2026 현재 매 NVMe/TCP, NVMe/RoCEv2 가 매 mainstream — 매 sub-100µs latency.
+
+## 매 핵심
+
+### 매 protocols
+- **Fibre Channel (FC)**: 매 traditional, 32/64 Gbps, 매 dedicated hardware (HBA, FC switch).
+- **iSCSI**: 매 SCSI over TCP/IP — 매 commodity ethernet, 매 cheap.
+- **FCoE**: 매 FC over Ethernet — 매 declining.
+- **NVMe-oF**: 매 NVMe command set, 매 sub-100µs.
+  - *NVMe/FC*: NVMe over Fibre Channel.
+  - *NVMe/RoCEv2*: NVMe over RDMA (lossless ethernet).
+  - *NVMe/TCP*: NVMe over standard TCP — 매 mainstream 2026.
+
+### 매 components
+- **Initiator**: 매 server (HBA / NIC).
+- **Target**: 매 storage array (LUN exposure).
+- **Fabric**: 매 FC switch / Ethernet switch.
+- **LUN (Logical Unit Number)**: 매 carved-out volume.
+- **Zoning** (FC) / **VLAN+CHAP** (iSCSI): 매 access control.
+- **Multipath I/O (MPIO)**: 매 redundant paths, 매 failover.
+
+### 매 SAN vs NAS vs DAS
+- **DAS**: 매 directly attached (USB, SATA) — 매 single server.
+- **NAS**: 매 file-level (NFS, SMB) — 매 shared filesystem.
+- **SAN**: 매 block-level — 매 OS 의 disk 의 보임.
+
+### 매 응용
+1. Enterprise virtualization (VMware vSphere VMFS).
+2. Database (Oracle ASM, SQL Server cluster).
+3. AI training (NVMe-oF flash array — Pure FlashBlade, NetApp).
+
+## 💻 패턴
+
+### Linux iSCSI initiator (open-iscsi)
+```bash
+sudo apt install open-iscsi
+sudo iscsiadm -m discovery -t sendtargets -p 10.0.0.10:3260
+sudo iscsiadm -m node --targetname iqn.2026-05.com.acme:lun0 \
+    -p 10.0.0.10 --login
+lsblk  # /dev/sdb appears as block device
+```
+
+### NVMe/TCP attach (Linux 6.x)
+```bash
+modprobe nvme-tcp
+nvme discover -t tcp -a 10.0.0.20 -s 4420
+nvme connect -t tcp -n nqn.2026-05.com.acme:nvme-subsys1 \
+    -a 10.0.0.20 -s 4420
+nvme list  # /dev/nvme1n1
+```
+
+### Multipath configuration (DM-Multipath)
+```bash
+# /etc/multipath.conf
+defaults {
+    user_friendly_names yes
+    find_multipaths yes
+    path_grouping_policy multibus
+    failback immediate
+}
+# Apply
+sudo multipath -r
+multipath -ll
+```
+
+### LVM on SAN LUN
+```bash
+sudo pvcreate /dev/mapper/mpatha
+sudo vgcreate vg_san /dev/mapper/mpatha
+sudo lvcreate -L 500G -n lv_db vg_san
+sudo mkfs.xfs /dev/vg_san/lv_db
+```
+
+### CHAP authentication (iSCSI)
+```bash
+# /etc/iscsi/iscsid.conf
+node.session.auth.authmethod = CHAP
+node.session.auth.username = iqn.2026-05.com.acme:initiator
+node.session.auth.password = <secret>
+```
+
+### FC zoning (Brocade-like CLI)
+```
+zonecreate "zone_db1", "10:00:00:00:c9:aa:bb:cc; 50:06:01:6a:11:22:33:44"
+cfgadd "cfg_prod", "zone_db1"
+cfgenable "cfg_prod"
+```
+
+### Performance test (fio)
+```bash
+fio --name=san-test --filename=/dev/mapper/mpatha \
+    --rw=randread --bs=4k --iodepth=64 --numjobs=8 \
+    --runtime=60 --time_based --direct=1 --group_reporting
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| Ultra-low latency, AI/HPC | NVMe-oF (RoCEv2 or TCP) |
+| Enterprise mixed workload | iSCSI 25/100 GbE |
+| Legacy VMware / Oracle | Fibre Channel (32/64 Gbps) |
+| Cloud-native | Object storage (S3) + EBS — 매 SAN 의 X |
+| Small dev/test | NFS/SMB NAS or DAS |
+
+**기본값**: 매 새 deployment → NVMe/TCP on 25/100 GbE. 매 FC 의 decline.
+
+## 🔗 Graph
+- 응용: [[Virtualization]]
+
+## 🤖 LLM 활용
+**언제**: enterprise on-prem block storage, low-latency shared storage 의 multiple servers.
+**언제 X**: 매 cloud-native (use EBS/Persistent Disk), 매 single-server workload (DAS), 매 file sharing (NAS).
+
+## ❌ 안티패턴
+- **No multipath**: 매 single switch failure → outage.
+- **iSCSI on shared VLAN**: 매 contention. 매 dedicated VLAN/network 의 사용.
+- **No zoning**: 매 LUN 의 모든 host 의 visible — 매 corruption risk.
+- **FC for greenfield**: 매 NVMe/TCP 의 cheaper, 매 faster.
+
+## 🧪 검증 / 중복
+- Verified (SNIA standards; Linux NVMe-oF docs; vendor docs Pure/NetApp 2025).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — SAN protocols incl. NVMe-oF mainstream patterns |