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NT Cluster & MS Dfs. Gunter Trowitzsch & DESY WindowsNT Group. Server Configuration. Unique OS software configuration for all servers: WNT 4.0 and Service Pack 3 Modular hardware configurations for most of all servers DEC Prioris base system 200 MHz Pentium Pro 128 MB memory

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nt cluster ms dfs

NT Cluster & MS Dfs

Gunter Trowitzsch&DESY WindowsNT Group

HEPNT - Windows NT Days

server configuration
Server Configuration
  • Unique OS software configuration for all servers:
    • WNT 4.0 and Service Pack 3
  • Modular hardware configurations for most of all servers
    • DEC Prioris base system
      • 200 MHz Pentium Pro
      • 128 MB memory
    • External SCSI disk systems2 mirrored hot swappable system disks
    • Fast Ethernet
    • PDC, Dfs Server, Mail Server, Cluster Nodes, BDC Zeuthen
  • BDC Hamburg : PC, 133 MHz Pentium II, 64 MB memory
  • WINS HH & ZN : PC, 90 MHz Pentium, 32 MB memory
  • Fileserver Zeuthen : Alpha, 266 MHz, 128 MB memory

HEPNT - Windows NT Days

print server
Print Server
  • Inside DESYNT the print jobs are spooled over the NT print server to the central UNIX print server.
  • At the moment the print server is a PC with a 166 MHz Pentium and 128 MB memory.
  • some smaller problems - availability and scaling
  • Test of Microsoft Cluster
    • successful
    • fail-over workstiming problems: server failure  starting a print job
  • To improve the situation we will upgrade to Microsoft Cluster with two nodes.
  • still a weak point - no job control over the whole process

HEPNT - Windows NT Days

home directory cluster
Home Directory Cluster
  • Digital WNT cluster
  • DEC Prioris MX6200, 200 MHz Pentium Pro
  • 256 MB memory
  • 2 shared differential SCSI buses
  • 2 DEC RA310 RAID array with2 RAID 5 sets
  • 110 GByte disk space

RA310

MX6200

256MB

MX6200

256MB

HEPNT - Windows NT Days

netinstall application cluster
NetInstall Application Cluster
  • Digital WNT Cluster
  • Digital Server 3000, 266 MHz Pentium II,
  • 128 MB memory,
  • 1 shared differential SCSI bus
  • DEC RA310 RAID array
  • 1 RAID 5 set
  • 25 GByte disk space

RA310

DS6200

128MB

DS6200

128MB

HEPNT - Windows NT Days

the desy windowsnt infrastructure

PDC

BDC

BDC

RAID Set

RAID Set

WINS

WINS

DFS

HD

NI

DESY Hamburg LAN

SQL

SMS

4 MBIT

Leased

Line

Print

Data Replication

DESYNT

File

Server

DESY Zeuthen LAN

The DESY WindowsNT Infrastructure

HEPNT - Windows NT Days

ms dfs at desy
MS Dfs at DESY
  • MS Dfs is a redirector for UNC requestssingle tree structure for multiple shared volumes located on different serversredirection of client connections to shares via redirection table on the Dfs server
  • Hardware
    • standard DESY server configuration
    • DEC Prioris, 200MHz Pentium Pro, 128 MB memory, Fast Ethernet
    • NT4 Server, SP3
  • Performance
    • Server
      • CPU consumption less then 5 %
      • 40 MB memory ( ~ 3000 entries )
    • Client:
      • first connection takes some time 0.5 to 2 seconds
      • Dfs cache is updated regular (not for active connections)
      • no performance losses (compared to a “direct” connection)

HEPNT - Windows NT Days

maintenance
Maintenance
  • simple
  • daily backup of the configuration table
    • using the scheduler service
    • private dump utility
    • dfscmd /view … > …./full separates with blanks !!  useless
  • restore by the help of dfsadmin (~30 minutes)
  • Replication of the configuration table between Hamburg and Zeuthen

HEPNT - Windows NT Days

experiences
Experiences
  • very useful service
  • used to provide (read) access to all home directories
  • not used to connect the user home directory (direct share connection)
  • used to provide access to the NetInstall applications or other shared offered applications and disk space
  • simple fail-over by using the alternative path
    • replication of file space - unique file/directory structures on servers
    • partial used between Hamburg and Zeuthen (NetInstall packages)
  • ACL handling is difficult up to NT4 with SP3
    • no GUI to handle the ACL’s
    • only the command line tools cacls and xcacls are available
    • full integration in to the Explorer with SP4

HEPNT - Windows NT Days

dfs summary
Dfs Summary
  • Advantages
    • it´s not a gateway, just a small redirector
    • no performance losses
    • easy to configure and to maintain
    • small load for client and server
  • Disadvantages
    • it´s a redirector, not a gateway
      • one can not reconfigure the client
      • client decides when the internal cache has to be updated
    • no nested links/redirections
    • ACL handling not integrated as desired
    • single point of failure - up to now not integrated in cluster solutions

HEPNT - Windows NT Days