# Multi-Channel Feature - Detailed Design Document

## 1. Overview

SMB3 Multi-Channel enables the use of multiple network connections between client and server, providing increased throughput, network fault tolerance, and automatic failover capabilities. This feature aggregates bandwidth across multiple NICs and provides seamless failover when network paths fail.

## 2. Protocol Specification Reference

- Update `Smb2CreateRequest/Response` for durable contexts

---

### Phase 3: Multi-Channel Support
**Priority: MEDIUM** | **Estimated Effort: 5-6 weeks**

Multi-channel enables using multiple network connections for improved performance and reliability.

#### 3.1 Core Multi-Channel Infrastructure
```
Package: jcifs.internal.smb2.multichannel

    long mul = K3;
    int topBit = 0x7;

    int lengthAligned = length & ~topBit;
    int lengthRemainder = length & topBit;
    long hash = seed ^ (length * mul);

    for (int i = 0; i < lengthAligned; i += 8) {
      long loaded = load64(bytes, offset + i);
      long data = shiftMix(loaded * mul) * mul;
      hash ^= data;
      hash *= mul;
    }

## Cloud Scale Deployment

The drives should all be of approximately the same size.

## Get Started with MinIO in Erasure Code

### 1. Prerequisites

    long mul = K3;
    int topBit = 0x7;

    int lengthAligned = length & ~topBit;
    int lengthRemainder = length & topBit;
    long hash = seed ^ (length * mul);

    for (int i = 0; i < lengthAligned; i += 8) {
      long loaded = load64(bytes, offset + i);
      long data = shiftMix(loaded * mul) * mul;
      hash ^= data;
      hash *= mul;
    }

        discoverLocalInterfaces();

        // Enable multi-channel if we have multiple usable interfaces
        if (canEnableMultiChannel()) {
            multiChannelEnabled = true;
            establishAdditionalChannels();
            log.info("Multi-channel enabled with {} channels", channels.size());
        }
    }

    /**
     * Check if multi-channel is enabled
     *
     * @return true if enabled

	UNDEF				// 00002a00

	ANDN	R4, R5, R6		// a6901600
	ANDN	R4, R5			// a5901600
	ORN	R4, R5, R6		// a6101600
	ORN	R4, R5			// a5101600

	// mul
	MUL	R4, R5	  		// a5101c00
	MUL	R4, R5, R6	  	// a6101c00
	MULV	R4, R5	   		// a5901d00
	MULV	R4, R5, R6	   	// a6901d00
	MULVU	R4, R5			// a5901d00
	MULVU	R4, R5, R6		// a6901d00
	MULHV	R4, R5			// a5101e00
	MULHV	R4, R5, R6		// a6101e00

import java.net.NetworkInterface;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import jcifs.internal.util.SMBUtil;

/**
 * Information about a network interface for SMB3 Multi-Channel
 */
public class NetworkInterfaceInfo {

    private int interfaceIndex;
    private int capability;
    private int linkSpeed; // In units of 1 Mbps
    private byte[] sockaddrStorage;

     * Defines how search results are ordered when no specific sort is requested.
     */
    @Size(max = 1000)
    public String defaultSortValue;

    /**
     * Virtual host configuration for multi-tenant setups.
     * Allows different search configurations based on the request host.
     */
    @Size(max = 10000)
    public String virtualHostValue;

    /**