271 lines
14 KiB
Markdown
271 lines
14 KiB
Markdown
# 🔌 Server connectivity — síťová a storage konektivita
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## Ethernet — síťová konektivita
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### Rychlosti a formáty
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| Rychlost | Označení | Form factor | Kabeláž | Rok standardu | Use case |
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|----------|----------|-------------|---------|---------------|----------|
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| **1 GbE** | 1000BASE-T | RJ45 (copper) | Cat5e/Cat6 | 1999 | Management, legacy |
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| **10 GbE** | 10GBASE-T / SFP+ | RJ45 / SFP+ | Cat6A (30m) / Cat7 (100m) / DAC / SR/LR | 2006 | Běžný server, storage |
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| **25 GbE** | 25GBASE-R | SFP28 | Cat8 (30m) / DAC (5m) / SR/LR (100m/10km) | 2016 | Standard pro servery (2020+) |
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| **40 GbE** | 40GBASE-R | QSFP+ | DAC (7m) / SR (150m) / LR (10km) | 2010 | Legacy, spine |
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| **50 GbE** | 50GBASE-R | SFP56 | DAC / SR / LR | 2018 | Emerging server |
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| **100 GbE** | 100GBASE-R | QSFP28 | DAC (3m) / SR4 (100m) / LR4 (10km) / PSM4 (500m) | 2015 | Spine, storage, AI |
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| **200 GbE** | 200GBASE-R | QSFP56 | DAC / SR4 / DR4 | 2019 | AI/ML, HPC |
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| **400 GbE** | 400GBASE-R | QSFP-DD / OSFP | DAC (2.5m) / SR8 (100m) / DR4 (500m) / FR4 (2km) | 2017 | AI training, hyperscale |
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| **800 GbE** | 800GBASE-R | QSFP-DD800 / OSFP | DAC (2m) / SR8 (100m) / DR8 (500m) | 2024 | Next-gen AI/ML |
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**Doporučení pro servery (2026)**:
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- **Standard**: 2× 25 GbE (management + data) nebo 2× 100 GbE pro náročné workloady
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- **AI/ML training**: 8× 400 GbE (InfiniBand preferován pro GPU communication)
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- **Storage**: 2× 25/100 GbE (iSCSI/NFS) nebo dedikovaná FC (16/32 Gbps)
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### Form factor NIC
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| Form factor | PCIe lanes | Rychlost | Use case |
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|------------|-----------|----------|----------|
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| **OCP 3.0** | x8/x16 | 25/100/200 GbE | Moderní servery (Dell, HPE), small form factor |
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| **PCIe HHHL** | x8 | 25/50 GbE | Standardní 1U/2U servery |
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| **PCIe FHHL** | x16 | 100/200/400 GbE | GPU servery, high-density |
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| **Mezzanine** | x8 | 10/25 GbE | Blade servery (HPE Synergy, Dell MX) |
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| **LOM (LAN on Motherboard)** | — | 1/10/25 GbE | Integrovaný, základní konektivita |
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### NIC features
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| Feature | Popis | Benefit |
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|---------|-------|---------|
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| **TSO/GRO** | TCP Segmentation Offload / Generic Receive Offload | Snížení CPU zátěže pro TCP |
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| **LRO/LSO** | Large Receive/Send Offload | Obdoba TSO/GRO pro legacy |
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| **RSS** | Receive Side Scaling | Distribuce příchozích packetů přes více CPU jader |
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| **RPS/RFS** | Receive Packet Steering / Flow Steering | Softwarové RSS, cache affinity |
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| **XDP** | eXpress Data Path | BPF-based packet processing (DDoS, load balancer) |
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| **RDMA (RoCE v2)** | RDMA over Converged Ethernet | GPU direct communication, storage (NVMe-oF) |
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| **iWARP** | RDMA over TCP | RDMA bez speciálního switch (vyšší latence) |
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| **DPDK** | Data Plane Development Kit | Uživatelský prostor pro packet processing (VNF, vSwitch) |
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| **VXLAN/NVGRE offload** | HW offload pro tunelování | Overlay networking (VMware NSX, OpenStack) |
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| **SR-IOV** | Single Root I/O Virtualization | Direct NIC access pro VM (VF), nízká latence |
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| **Flow Bifurcation** | Split NIC traffic mezi kernel a DPDK | Souběžný management a high-speed data path |
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| **PTP (IEEE 1588)** | Precision Time Protocol | Finanční služby, 5G, telco |
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### NIC selection per workload
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| Workload | Doporučená NIC | Zdůvodnění |
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|----------|---------------|------------|
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| **Web / API servery** | 2× 25 GbE SFP28, OCP | Nízká cena, dostatečná bandwidth |
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| **Virtualizace (VMware)** | 2× 25 GbE (SR-IOV, VXLAN offload) | SR-IOV pro VM, VXLAN pro NSX |
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| **Databáze (OLTP)** | 2× 25/100 GbE (RSS, low latency) | Nízká latence, RSS pro CPU scaling |
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| **Storage (NFS/iSCSI)** | 2× 25/100 GbE (RoCE v2) | RDMA pro NVMe-oF, low latency |
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| **Storage (FC SAN)** | 2× 32 Gb FC HBA | SAN pro VMware VMFS, block storage |
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| **AI/ML training** | 8× 400 GbE + InfiniBand NDR | GPU communication, data ingestion |
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| **AI/ML inference** | 4× 100 GbE (RoCE v2) | Model serving, GPU direct |
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| **HPC** | InfiniBand NDR 400 Gbps | MPI communication, low latency |
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| **Telco / Edge** | 2× 25 GbE (DPDK, PTP) | VNF, 5G UPF, low latency |
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---
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## Storage connectivity
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### Fibre Channel (FC) SAN
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| Generace | Rychlost | Označení | Form factor | Dosah (SMF) | Use case |
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|----------|----------|----------|-------------|-------------|----------|
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| **Gen 5** | 16 Gbps | 16GFC | SFP+ | 10 km | Legacy SAN |
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| **Gen 6** | 32 Gbps | 32GFC | SFP28 | 10 km | Současný standard |
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| **Gen 7** | 64 Gbps | 64GFC | SFP56 | 10 km | Emerging, high-performance |
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| **Gen 8** | 128 Gbps | 128GFC | QSFP28 | 10 km | Emerging (první produkční nasazení) |
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**HBA (Host Bus Adapter)**:
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| Výrobce | Model | Rychlost | PCIe | Porty | Features |
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|---------|-------|----------|------|-------|----------|
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| **Broadcom / Emulex** | LPe35000 | 32 GFC | PCIe 3.0 x8 | 1-2 | NVMe-FC, T10-PI, SR-IOV |
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| **Broadcom / Emulex** | LPe36000 | 64 GFC | PCIe 4.0 x16 | 1-2 | NVMe-FC, FC-NVMe |
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| **Marvell / QLogic** | QLE2770 | 32 GFC | PCIe 3.0 x8 | 1-2 | FC-NVMe, T10-PI |
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| **Marvell / QLogic** | QLE2870 | 64 GFC | PCIe 4.0 x8 | 1-2 | NVMe-FC, 64GFC |
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**FC SAN topology**:
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```
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Server ──HBA── FC Switch ──── Storage Array (FC port)
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│ │
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│ ┌────┴────┐
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│ │ Fabric │
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│ └─────────┘
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│
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──── ISL (Inter-Switch Link) ──── backup fabric (B)
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```
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**Zoning** (FC):
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```
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Zone A: Server1_HBA1 + Storage_Port1 (production)
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Zone B: Server1_HBA2 + Storage_Port2 (backup fabric)
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Zone C: Backup_Server + Storage_Target (backup)
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```
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### iSCSI
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| Vlastnost | iSCSI | Poznámka |
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|-----------|-------|----------|
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| **Transport** | TCP/IP (port 3260) | Po standardním ethernetu |
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| **Rychlost** | 1/10/25/100 GbE | Stejná jako Ethernet |
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| **Initiator** | SW (OS) nebo HW (TOE) | SW initiator zdarma, ~5-10 % CPU load |
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| **Multipathing** | MPIO (Multiple Connections per Session) | Až 8 cest, active/active nebo active/passive |
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| **CHAP** | Authentication | Mutual CHAP doporučen |
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| **Jumbo frames** | Doporučeno MTU 9000 | Snížení CPU overhead, vyšší throughput |
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| **Use case** | Malé a střední SAN, backup, DR | Levnější než FC, nižší výkon |
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**iSCSI configuration**:
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```
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# Software initiator (Linux)
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iscsiadm -m discovery -t sendtargets -p 10.0.0.100:3260
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iscsiadm -m node --login -T iqn.2024-05.storage:array01
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# Multipath (dm-multipath)
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mpathconf --enable --with_multipathd y
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# /etc/multipath.conf: aliases, failback, rr_min_io
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```
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### NVMe-oF (NVMe over Fabrics)
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| Transport | Protokol | Latence | CPU overhead | Use case |
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|-----------|----------|---------|-------------|----------|
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| **NVMe over FC** | FC-NVMe (FC Gen 6/7) | <10 µs | Nízký | Enterprise SAN, VMware |
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| **NVMe over RDMA (RoCE v2)** | RDMA (RoCE) | <5 µs | Velmi nízký | AI/ML, HPC, K8s (CSI) |
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| **NVMe over TCP** | TCP | ~50 µs | Střední (10-20 % CPU) | Standardní Ethernet, bez RDMA |
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| **NVMe over InfiniBand** | IB RC/UC | <3 µs | Nejnižší | HPC, AI training |
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**NVMe-oF comparison**:
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| Vlastnost | FC-NVMe | NVMe/RoCE | NVMe/TCP | NVMe/IB |
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|-----------|---------|-----------|----------|---------|
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| **Latence (target)** | ~8 µs | ~4 µs | ~50 µs | ~3 µs |
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| **Bandwidth** | 64 Gbps | 100/200 GbE | 25/100 GbE | NDR 400 Gbps |
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| **Requires special HW** | FC HBA + switch | RoCE NIC + DCB switch | Standard NIC | IB HCA + switch |
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| **Ecosystem** | Broadcom, Marvell | NVIDIA, Broadcom | OS built-in | NVIDIA Mellanox |
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| **Use case** | VMware, enterprise SAN | AI/ML, K8s, HPC | SMB, K8s, cost-effective | HPC, large AI |
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### SAS (Serial Attached SCSI)
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| Generace | Rychlost | Kabeláž | Dosah | Use case |
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|----------|----------|---------|-------|----------|
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| **SAS 3** | 12 Gbps | SAS cable (SFF-8644) | 6-10 m | Legacy storage, DAS |
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| **SAS 4** | 22.5 Gbps | SAS cable (SFF-8644) | 6-10 m | Současný standard |
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| **SAS 5** | 45 Gbps | SAS cable (SFF-8644) | 6-10 m | Emerging |
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**SAS topology**: Server → SAS HBA → SAS expander → SAS disk (point-to-point, ne shared jako FC)
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---
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## Server connectivity — decision matrix
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| Workload | Primární | Sekundární | Management |
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|----------|----------|-----------|------------|
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| **Web / API** | 2× 25 GbE (LACP) | — | 1× 1 GbE BMC |
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| **Databáze** | 2× 25/100 GbE (RSS) | 2× 32 Gb FC (SAN) | 1× 1 GbE BMC |
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| **Virtualizace** | 4× 25 GbE (SR-IOV) | 2× 32 Gb FC (VMFS) | 1× 1 GbE BMC |
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| **Kubernetes** | 2× 25/100 GbE | — | 1× 1 GbE BMC |
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| **Storage node** | 2× 100 GbE (RoCE) | 2× 25 GbE (management) | 1× 1 GbE BMC |
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| **AI training** | 8× 400 GbE + IB NDR | 4× 100 GbE (storage) | 1× 1 GbE BMC |
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| **AI inference** | 4× 100 GbE (RoCE) | 2× 25 GbE (management) | 1× 1 GbE BMC |
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| **HPC** | InfiniBand NDR | 2× 100 GbE (storage) | 1× 1 GbE BMC |
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---
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## Server NIC placement (PCIe slot optimization)
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```
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2U Server (GPU/AI):
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┌─────────────────────────────────────────────────┐
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│ PCIe 0: GPU (x16) — NVLink / InfiniBand (x16) │
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│ PCIe 1: GPU (x16) — NIC 100 GbE (x16) │
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│ PCIe 2: GPU (x16) │
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│ PCIe 3: GPU (x16) │
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│ PCIe 4: GPU (x16) │
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│ PCIe 5: GPU (x16) — NIC 100 GbE (x16) │
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│ PCIe 6: Storage HBA / NIC (x8) │
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│ PCIe 7: Management / OCP (x8) │
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└─────────────────────────────────────────────────┘
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1U Standard:
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┌─────────────────────────────────┐
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│ OCP: 2× 25 GbE (management) │
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│ PCIe 0: NIC 25 GbE (x8) │
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│ PCIe 1: Storage HBA / FC (x8) │
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│ PCIe 2: GPU (x16, optional) │
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│ PCIe 3: NVMe (x4, M.2) │
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└─────────────────────────────────┘
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```
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### NVIDIA Mellanox ConnectX NICs
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NVIDIA Mellanox je přední výrobce NIC adaptérů pro AI/HPC a cloud datová centra.
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| Model | PCIe | Max rychlost | Form factor | Klíčové features |
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|-------|------|-------------|-------------|------------------|
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| **ConnectX-5** | PCIe 3.0 x16 | 100 GbE (dual) | HHHL | RoCE, NVMe-oF target offload, MPI offload |
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| **ConnectX-6 Dx** | PCIe 4.0 x16 | 200 GbE (1-port) / 100 GbE (2-port) | HHHL, OCP 3.0 | ASAP² vSwitch offload, IPsec/TLS inline crypto, AES-XTS, 215 Mpps DPDK |
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| **ConnectX-6 Lx** | PCIe 4.0 x8 | 25 GbE (dual) | HHHL, OCP 3.0 | RoCE, Secure Boot, low-power |
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| **ConnectX-7** | PCIe 5.0 x16 | 400 GbE (1-port) / 200 GbE (2-port) | HHHL | NDR InfiniBand + 400GbE, GPUDirect, SHARP |
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| **ConnectX-8** | PCIe 6.0 x16 | 800 GbE (1-port) / 400 GbE (2-port) | HHHL | XDR InfiniBand, sub-500ns latence, in-network computing, multi-host |
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**Platformy**: Spectrum-X Ethernet (end-to-end AI networking), Quantum InfiniBand, BlueField DPU.
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### Broadcom Emulex FC HBA
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| Model | Rychlost | PCIe | Porty | Features |
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|-------|----------|------|-------|----------|
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| **LPe35000** (Gen 7) | 32 GFC | PCIe 3.0 x8 | 1-2 | NVMe-FC, T10-PI (DIF), SR-IOV, Silicon Root of Trust |
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| **LPe35002** (Gen 7) | 32 GFC | PCIe 3.0 x8 | 2 | NVMe-FC, Secure Boot, digitálně podepsaný firmware |
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| **LPe36000** (Gen 7) | 64 GFC | PCIe 4.0 x16 | 1-2 | První 64GFC HBA na trhu, 10M IOPS, 3× lepší latence než Gen 6 |
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**Klíčové vlastnosti**: podpora NVMe over FC, T10 DIF (Data Integrity Field), 10M MTBF, NIST SP 800-193 compliant. Gen 7 přináší až 10M IOPS a 3× nižší latenci oproti Gen 6.
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### NVMe-oF specifikace
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NVMe over Fabrics (NVMe-oF) rozšiřuje NVMe protokol z lokálního PCIe na síťové transporty. První specifikace 1.0 vydána v červnu 2016, aktuálně součástí NVMe 2.3 (srpen 2025). Podporované transporty:
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| Transport | Specifikace | Use case |
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|-----------|------------|----------|
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| **NVMe over PCIe** | NVMe Base | Lokální NVMe SSD |
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| **NVMe over RDMA** (RoCE, InfiniBand, iWARP) | NVMe Transport | AI/ML, HPC, nejnižší latence <5 µs |
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| **NVMe over TCP** | NVMe Transport | Standardní Ethernet, bez RDMA, latence ~50 µs |
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| **NVMe over FC** (FC-NVMe) | INCITS T11 | Enterprise SAN, FC fabric |
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NVMe 2.3 přidává Computational Programs Command Set, Storage Level Management (SLM), a Zoned Namespaces (ZNS). NVMe-MI definuje management rozhraní.
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### Dell PowerEdge R760 — NIC placement
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Server Dell R760 podporuje:
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- **OCP 3.0** adaptéry (až 2×) — 1/10/25/100 GbE
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- **PCIe Gen5** sloty — 8× slotů (6× FHHL + 2× LP)
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- **LOM** — 2× 1 GbE Broadcom 5720 na základní desce
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- Maximální rychlost NIC: 100 GbE (QSFP56)
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- Supported typy: RJ45, SFP+, SFP28, QSFP28, QSFP56
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Doporučené konfigurace:
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- Standard: OCP 3.0 2× 25 GbE + PCIe storage HBA
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- AI/ML: PCIe 100 GbE (riser config 1, slot 1-2) + GPU v ostatních slotech
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### HPE Gen11 NIC options
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HPE ProLiant Gen11 (DL360/DL380) podporuje:
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- **OCP 3.0** sloty (až 2) — 10/25/100/200 GbE (Broadcom, Intel, NVIDIA Mellanox)
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- **PCIe Gen5** adaptéry — 8× slotů (DL380) / 3× sloty (DL360)
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- **iLO 6** dedikovaný management port (1 GbE)
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- Podporované NIC: Broadcom BCM57412 (10GbE), BCM57504 (25GbE), NVIDIA ConnectX-6 Dx (100GbE)
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## Zdroje
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Odkazy, knihy a standardy: [sources/infrastructure/sources.md](sources/infrastructure/sources.md)
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### Doporučená literatura
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| Kniha | Autoři | ISBN | Popis |
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|-------|--------|------|-------|
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| AI Data Center Network Design and Technologies (1st ed., 2026) | Subramaniam, Styszynski, Tambakuwala | 978-0-13-543628-8 | První vendor-agnostický průvodce návrhem sítí pro AI trénování a inferenci. Pokrývá high-radix fabric, lossless Ethernet/IP, UEC technologie, chlazení a power pro AI klastry. Autoři z HPE Juniper Networking. |
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*Poslední revize: 2026-06-03*
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