# 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

	MOVM.IA	4(R1), [R0-R4]     // ERROR "offset must be zero"
	MOVM.DA	4(R1), [R0-R4]     // ERROR "offset must be zero"
	MOVM.IB	4(R1), [R0-R4]     // ERROR "offset must be zero"
	MOVM.DB	4(R1), [R0-R4]     // ERROR "offset must be zero"
	MOVM.IA	[R0-R4], 4(R1)     // ERROR "offset must be zero"
	MOVM.DA	[R0-R4], 4(R1)     // ERROR "offset must be zero"
	MOVM.IB	[R0-R4], 4(R1)     // ERROR "offset must be zero"

Harshavardhana <******@****.***> 1727165038 -0700

Harshavardhana <******@****.***> 1727165038 -0700

- 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

	SUBV	$9531, R16	// 6210dac5
	SUBV	$-9531, R13	// 61ad253b
	SUBVU	$9531, R16	// 6610dac5

//	LMUL rreg ',' rreg
//	{
//		outcode(int($1), &$2, 0, &$4);
//	}
	MUL	R19, R8		// 01130018
	MULU	R21, R13	// 01b50019
	MULV	R19, R8		// 0113001c
	MULVU	R21, R13	// 01b5001d

//	LDIV rreg ',' rreg
//	{
//		outcode(int($1), &$2, 0, &$4);
//	}
	DIV	R18, R22	// 02d2001a
	DIVU	R14, R9		// 012e001b

"-ce", "/usr/bin/docker-entrypoint.sh minio -S {{ .Values.certsPath }} server --address :{{ .Values.minioAPIPort }} --console-address :{{ .Values.minioConsolePort }} {{- range $i := until $poolCount }}{{ $factor := mul $i $nodeCount }}{{ $endIndex := add $factor $nodeCount }}{{ $beginIndex := mul $i $nodeCount }} {{ $scheme }}://{{ template `minio.fullname` $ }}-{{ `{` }}{{ $beginIndex }}...{{ sub $endIndex 1 }}{{ `}`}}.{{ template `minio.fullname` $ }}-svc.{{ $.Release.Namespace }}.svc.{{ $.Values.clusterDomain...

.Values.image.repository }}:{{ .Values.image.tag }} imagePullPolicy: {{ .Values.image.pullPolicy }} command: [ "/bin/sh", "-ce", "/usr/bin/docker-entrypoint.sh minio server {{- range $i := until $poolCount }}{{ $factor := mul $i $nodeCount }}{{ $endIndex := add $factor $nodeCount }}{{ $beginIndex := mul $i $nodeCount }} {{ $scheme }}://{{ template `minio.fullname` $ }}-{{ `{` }}{{ $beginIndex }}...{{ sub $endIndex 1 }}{{ `}`}}.{{ template `minio.fullname` $ }}-svc.{{ $.Release.Namespace }}.svc.{{ $.Values.clusterDomain...

#### Key rotation

S3 clients can change the client-provided key of an existing object. Therefore an S3 client must perform a S3 COPY operation where the copy source and destination are equal. Further the COPY request headers must contain the current and the new client key:

        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