Manuals / Sun Microsystems / Computer Equipment / Server

Sun Microsystems 2.1 manual Hot swappability, Efﬁcient use of disk bandwidth, Random access

Models: 2.1

1 184

Download 184 pages 37.97 Kb

Page 18

Hot swappability

The MFS supports the replacement of a failed disk while the server continues to deliver streams. Following disk replacement, you use a single command to restore data from the parity disk to the new disk and return the server to normal playback mode. The procedure for hot swapping a disk is described in Chapter 8, “Administering MFS Disks.”

Efﬁcient use of disk bandwidth

The ﬁle system is designed to extract a signiﬁcant portion of the available disk bandwidth (50-90%). Content is striped across the disk array.

The MFS compensates for thermal recalibration delays.

Efﬁcient transfer from disk to output

The MFS is designed to transfer data from the disk array to the output network with a minimum of processor involvement.

Large ﬁle and ﬁlesystem size

An MFS ﬁle can be as large as (264)- 1 bytes in length; an MFS can contain up to 231 ﬁles. In practice, ﬁle size and ﬁlesystem size are limited by available disk space rather than any limits imposed by the MFS.

High-resolution rate control

The MFS controls the rate of output so that any one output packet may be delivered within the resolution of the underlying hardware/software system.

Random access

The controller of a stream may stop and start a stream at nearly arbitrary points. The server maps these requests to the nearest content packet (for example, MPEG- 2 Transport Packet) boundary. This random access feature is used in trick play.

Section 2.2, “MPEG Encoding Requirements for Trick Play,” on page 2-2 for a discussion of splice points in trick-play ﬁles.

Admission control

The MFS will not accept a request for a new stream that would cause it to fail to deliver all its streams at the request data rate.

File locking

The MFS ensures that streams that are currently being played are not removed.

The MFS consists of ﬁve basic subsystems:

■ﬁle system layout manager

The MFS layout manager allocates and deallocates disk blocks to content using striping and parity algorithms.

1-6Sun MediaCenter Server Administrator’s Guide • December 1997

Image 18

Sun Microsystems 2.1 Hot swappability, Efﬁcient use of disk bandwidth, Efﬁcient transfer from disk to output, File locking

Contents

A Sun Microsystems, Inc. Business 901 San Antonio Road Sun MediaCenter Server Administrator’s GuideRelease Palo Alto, CA 94303 USA 415 960-1300 fax 4151997 Sun Microsystems, Inc. All rights reserved Contents 2. Preparing and Loading Content1. Introduction 4. Moving Content iv Sun MediaCenter Server Administrator’s Guide December3. Monitoring the Server 5. Sun MediaCenter Server Utilities 6. Sun MediaCenter Server FTP Daemon8.2.1 mfs df 8.2.2 mfs diskusg 8.2.3 mfs repair 8.2.4 mkmfs vi Sun MediaCenter Server Administrator’s Guide DecemberA. Setting up the SNMP Agent 9. Access Control Lists10. Troubleshooting B. Creating a Content Package B-1viii Sun MediaCenter Server Administrator’s Guide December Glossary Glossary-1 Index Index-1Preface Who Should Use This BookThe Sun MediaCenter Documentation Suite How This Book Is Organizedx Sun MediaCenter Server Administrator’s Guide December What Typographic Changes Mean TABLE P-1 Typographic ConventionsTABLE P-2 Shell Prompts Shell Prompts in Command Examplesxii Sun MediaCenter Server Administrator’s Guide December ShellIntroduction 1.1 Introduction1.2 Sun MediaCenter Hardware Fast Ethernet or ATM Fast/Wide or Ultra SCSI Control Content From tape, network-accessible ﬁle, or live sourceSun MediaCenter Server Media File System Files1.3 Sun MediaCenter Software FIGURE 1-2 Sun MediaCenter Software Architecture1.3.1 Media File System MFS Guaranteed stream delivery rateRecovery from single-disk failures Independent streamsHot swappability High-resolution rate controlRandom access Efﬁcient use of disk bandwidthDisk Driver 1.3.2 Media Stream ManagerMedia File System Layout Manager Scheduler Bit Pump Buffers Output Driver1.3.4 Web-based Tools 1.3.3 Content Manager1.4 Video Output Interfaces MediaCenter Server Programmer’s Guide1.4.1 ATM 1.4.2 LANFIGURE 1-4 Sun MediaCenter Servers in ATM Environment 1.5 Content Preparation and Loading FIGURE 1-5 Sun MediaCenter Servers in LAN environment1.6 Server Management 1.7 Push Model1.8 Design Beneﬁts 1-12 Sun MediaCenter Server Administrator’s Guide DecemberPreparing and Loading Content 2.1 General MPEG Encoding Requirements2.2 MPEG Encoding Requirements for Trick Play 2.3 Splice Points 2.3.1 Packet Boundary2.3.2 closedgop 2.3.3 payloadunitstartindicator2.3.5 randomaccessindicator 2.3.4 adaptationﬁeldcontrol2.4 Content Loading To copy to or extract from a tape device, use smctar 2.5 References 2-8 Sun MediaCenter Server Administrator’s Guide December Monitoring the Server 3.1 Overview3.2 Using the WebAdmin Tool 3.2.1 Invoking the ToolFIGURE 3-1 Sun MediaCenter Page Chapter 3 Monitoring the Server3-4 Sun MediaCenter Server Administrator’s Guide December Once the applet loads, the Resource Utilization page is displayedFIGURE 3-2 Resource Utilization Page 3.3 Resource Utilization 3.2.2 Common Page ElementsVideos being copied 3.4 Streaming VideosTroubleshooting Disk CapacityFIGURE 3-3 Streaming Videos Page speed Fast-Forward, Slow Motion, Stopped, Playing, Reverse 3-8 Sun MediaCenter Server Administrator’s Guide Decemberthe title being viewed FIGURE 3-4 Streaming Videos Page with Stream Detail3.5 Copy Sessions title of the content being transferred The Session Information page is shown below FIGURE 3-6 Session Information PageChapter 3 Monitoring the Server 3.6 Disk Capacity FIGURE 3-7 Disk Capacity Page The Disk Info page is shown below The Troubleshooting page is shown below 3.7 TroubleshootingThe bottom portion of the page shows any late events or disk errors Chapter 3 Monitoring the ServerThe Troubleshooting page contains the following links The Disk Health page is shown below 3.7.1 Disk HealthThis page shows the status of disks in the MFS Chapter 3 Monitoring the Server3.7.2 Console Log FIGURE 3-11 Console Log Page Chapter 3 Monitoring the Server3.7.3 Scheduler and Bitpump 3-20 Sun MediaCenter Server Administrator’s Guide DecemberThe Bitpump page is shown below TABLE 3-1 describes the ﬁelds in this page TABLE 3-1 Scheduler and Bitpump StatisticsTABLE 3-1 Scheduler and Bitpump Statistics Continued Current number of bit pump streams bitPumpbitPumpStreams bitPumpBandwidth3-24 Sun MediaCenter Server Administrator’s Guide December Moving Content 4.1 Overview4.2 Using CmTool 4.2.1 Invoking the ToolChapter 4 Moving Content FIGURE 4-1 Sun MediaCenter PageFIGURE 4-2 Table of Contents Page 4-4 Sun MediaCenter Server Administrator’s Guide December4.3 Loading Content 4.2.2 Common Page ElementsUpon successful login, the Load Content page is displayed FIGURE 4-3 Server Login Page4-6 Sun MediaCenter Server Administrator’s Guide December FIGURE 4-4 Load Content Page FIGURE 4-5 Content on Remote System 4-8 Sun MediaCenter Server Administrator’s Guide DecemberChapter 4 Moving Content FIGURE 4-6 Specifying a Local Title4-10 Sun MediaCenter Server Administrator’s Guide December FIGURE 4-7 Copy ConﬁrmationFIGURE 4-8 Session Information 4.4 Table of Contents Page FIGURE 4-9 Table of Contents Page4-12 Sun MediaCenter Server Administrator’s Guide December 4.4.1 View Menu FIGURE 4-10 Display Attributes Dialog Box4-14 Sun MediaCenter Server Administrator’s Guide December FIGURE 4-11 Sort Dialog BoxFIGURE 4-12 Filter Dialog Box 4.4.2 Selected Menu FIGURE 4-13 Title Information Page4-16 Sun MediaCenter Server Administrator’s Guide December 5.1 Setting a Title Access Control List Sun MediaCenter Server UtilitiesTo extend access for a title that you own, use the smcsettacl command where username is a Solaris login name 5.2 The smccopy Utility titlehostnametitle r rate ﬁlenamehostnameﬁlename s speedt type The following are examples of smccopy useThe following command copies a ﬁle between two local ﬁlesystems 5.3 The smctar Utility 5.3.1 Syntax and Optionsb blknum 5.3.2 Content Loading 5.3.3 Copying Content FIGURE 5-1 Loading Content with smctartar Device or File Sun MediaCenter MFSTitle Optional Sun MediaCenter Title MFS5.3.4 Remote Copying and Extraction 5.3.5 Examplesserver# smctar xf /dev/rmt/0 smcserverbambi server# tar cf - your title.TOC your content.mpg smctar xfremotehost# tar cf - your title.TOC your content.mpg smctar xf \ remotehost# smctar cf /dev/rmt/0 smcserverbambiAn alternative to the preceding commands is #!/bin/sh # smcbackup Script to archive multiple SMC titles to tape 5-16 Sun MediaCenter Server Administrator’s Guide December 5.4 The smcls Utility Display the format of this title Display the time the title was last modiﬁed 5-20 Sun MediaCenter Server Administrator’s Guide December client% smcls -ltsmcls my-server”a-z*” 5.5 The smcrm Utility smcls -lrtBserver% smcrm SUNWbambi SGIquovadis 5-22 Sun MediaCenter Server Administrator’s Guide December Sun MediaCenter Server FTP Daemon Standard 6-2 Sun MediaCenter Server Administrator’s Guide DecemberFIGURE 6-1 Sun MediaCenter FTP Functions Daemon6.1 Keyword for Video-File Functions 6.2 Video-File Attributes 6.3 Video-File Commands delete dir get ls mget mls mput put rename6-6 Sun MediaCenter Server Administrator’s Guide December ftp dir smctitle=\ftp dir smctitle=Bat\ 6.3.1 Listing Files list continues to conclusionlist continues to conclusion 6-8 Sun MediaCenter Server Administrator’s Guide December 6.3.2 Moving Files 6.3.2.1 Moving Single Titles Directions of put/ get CommandsPage 6.3.2.2 Moving Multiple Titles 6.3.3 Renaming Files 6.4 Loading Content with ftp 6.3.4 Deleting Files230 User clinton logged in. ftp lcd /home/encode ftp bin 331 Password required for clinton. Passwordencodingmachine% ftp smcserverone Connected to smcserverone 200 Type set to6-16 Sun MediaCenter Server Administrator’s Guide December Server Output Data Format 7.1 Introduction7.2.1 MPEG-2 Transport Stream Packet Encapsulation Content7.2 ATM Encapsulation Sun MediaCenter Server7.2.4 Thomson Electronics Packet Encapsulation 7.2.2 MPEG-2 Program Stream Packet Encapsulation7.2.3 MPEG-1 System Stream Packet Encapsulation 7.2.5 MPEG-2 Encapsulation over Classical IP over AAL57.3 ATM Addressing 7.3.1 MPEG over AAL57.3.2 MPEG-2 over Classical IP over AAL5 7.4 Fast Ethernet Encapsulation host=IP hostname,udpport=UDPport num7.4.1 MPEG-2 Transport Stream Packet Encapsulation FIGURE 7-2 LAN/Enterprise Scenario7.4.3 MPEG-1 System Stream Packet Encapsulation 7.5 Fast Ethernet Addressing7.4.2 MPEG-2 Program Stream Packet Encapsulation 7.4.4 Thomson Electronics Encapsulation7.6 Specifying Encapsulation TABLE 7-1 Value of encap Field in MsmConnect7.7 Differences Among Different Types of Links 7.8 References7-10 Sun MediaCenter Server Administrator’s Guide December Administering MFS Disks 8.1 Monitoring MFS Disks8.2 MFS Utilities 8.2.1 mfs dfmfs df usage is as follows 8.2.2 mfs diskusg 8.2.3 mfs repair d device mfs repair usage is as followsTo ﬁnd out which MFS disk has failed, you enter 8.2.4 mkmfs Drive name /dev/rdsk/c1t1d0s2 Drive name /dev/rdsk/c1t2d0s2 8.3 Replacing a Failed Disk 8-10 Sun MediaCenter Server Administrator’s Guide Decemberserver# mfs repair -r -d /dev/rdsk/c1t4d0s2 server# mfs repair -p -d /dev/rdsk/c1t4d0s2server# mfs repair -rp -d /dev/rdsk/c1t4d0s2 Note -Two overlapping disk failures result in a system panic Access Control Lists 9.1 ACL Filesuserpermission 9.2 Permissions9.3 Server ACL nobodypermission9.4 Player ACL 9.5 Title ACL 9.6 Session ACLA session ACL has a single type of permission 9-6 Sun MediaCenter Server Administrator’s Guide December Troubleshooting 10.1 Symptoms and Possible Solutions/ WorkaroundsServer watchdog resets on start of video stream playback Underperforming stream output No video displays on client10-2 Sun MediaCenter Server Administrator’s Guide December Kernel panic with SAHI queue threshold messages Poor video qualityCorrupt disk labels Disk failure10.2 Error Messages 10.2.1 Server Console MessagesUnable to create title on the MFS NOTICE ba0 qsize OK 10.2.2 MFS Error MessagesWARNING stream id 107 ba@426,3,80@ xmit error Q size NOTICE ba3 qsize 9 above hiwat10-6 Sun MediaCenter Server Administrator’s Guide December Setting up the SNMP Agent A.1 The Sun MediaCenter Server MIB TABLE A-1 Sun MediaCenter Server MIB DeﬁnitionsdiskErrorTable Appendix A Setting up the SNMP Agent A-3diskError bitPumpfailure A-4 Sun MediaCenter Server Administrator’s Guide DecemberdiskTable onlinesysTimePeriodLength Appendix A Setting up the SNMP Agent A-5sysZonesPerDisk sysNumberOfBuffersA.2 Enabling Management by Solstice Domain Manager 1. Become root4. Copy smsvod.mib to $SNMHOME/agents 5. Run $SNMHOME/bin/mib2schema smsvod.mibThis command creates smsvod.mib.schema and smsvod.mib.oid Under “instance elementCommand”6. Run buildoid with no arguments A.3 Enabling Trap Handling The Sun MediaCenter software ensures delivery of media streams at the same rate at which they were recorded. The bit pump’s missing of a deadline indicates that the machine was, at least momentarily, unable to keep up with the rate of a title. This indicates a resource conﬂict on the server Creating a Content Package B.1 Content Package B.2 The TOC File A TOC ﬁle is described with the following structures B.2.1.2 version B.2.1 ContentObjectsB.2.1.1 title B.2.1.3 formatB.2.2.1 description B.2.2 BitStreamObjectsB.2.1.4 description B.2.2.2 speedB.2.2.4 indexﬁle B.2.3 DataFileObjectsB.2.2.3 bitrate B.2.2.5 indexsizeB.3 Simplest Case TOC File B.2.3.2 ﬁlepathB.2.3.3 ﬁlesize version B.4 TOC File for Large Filestitle formatB.5 Index File Requirements B.5.1 Normal Play Time B.6 Tape Storage Format B.5.2 File OffsetB.6.1 Tar Format Appendix B Creating a Content Package B-13 FIGURE B-2 Tape Storage FormatB.7 Example B.6.2 TapesCODE EXAMPLE B-1 Example Content Package Appendix B Creating a Content Package B-15B-16 Sun MediaCenter Server Administrator’s Guide December For a ﬁle bambi.1x index ﬁle for normal-speed play B.8 References Appendix B Creating a Content Package B-19 B-20 Sun MediaCenter Server Administrator’s Guide December Glossary Glossary-1Media Stream Manager Table of Contents Glossary-3Glossary-4 Sun MediaCenter Server Administrator’s Guide December Index Page Page Page Page Index-6 Sun MediaCenter Server Administrator’s Guide December