State of the Art UNIX High Availability Tru

State of the Art UNIX High Availability Tru. Cluster Server V 5. 0 Technical Overview John Zimmerman Digitask Consultants, Inc. digitask@digitask. com (212) 682 -6652 Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Agenda Tru. Cluster History u Tru. Cluster Server V 5. 0 functional overview u Application support u Tru. Cluster Server V 5. 0 software components u Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Tru. Cluster Technology Waves Version 1. 6 Available Server Production Server SSI Server Theme: HA Applications Theme: HA and Scalable Applications Theme: SSI Storage and System Management Theme: SSI Process Management Delivered: Q 1 CY 94 Delivered: Q 1 CY 96 ESP: Q 2 CY 99 Vol: Q 1 CY 00 Planning: H 1 CY 01 HA applications: SAP, Oracle, Tuxedo, INET, Sybase, Informix, . . . Applications: OPS and Informix XPS Cluster File System Integration of NSC Cluster Alias SSI Process Management Cluster Volumes Automatic Load Balancing Application Availability Process Migration Cluster wide Events Multi-Cluster DT Membership, Storage Monitoring and Management Synchronization Service Membership Service Cluster Disk Service, Adv. FS, LSM, HW RAID IO Barriers Shared SCSI, Standard Networks Memory Channel Shared SCSI and FC Extended Cluster DT Version 5 Version n Cluster Disk Service Shared SCSI and FC Extended Cluster DT Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Tru. Cluster Server Version 5. 0 u Single System Image cluster l Shared file system Dramatically easier management u Simpler application availability and scalability u Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Feature Summary u Cluster viewed as a single highly available system l l System and Storage Management Binary compatibility with Tru 64 UNIX V 5. 0 and prior versions / /usr /. . . /var /. . . Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Feature Summary u Cluster components are the enabling technology l l u Cluster File System for coherent access to all file systems, including the root Cluster wide storage Cluster Alias for single system view from the network Cluster Application Availability services Support for larger & more flexible configurations No requirement for symmetric configurations l No need for private storage (all storage can be on shared buses) l Copyright © 2003 Digitask Consultants Inc. , All rights reserved

System and Storage Management u CFS is an enabling technology l l Most management operations “just work” Single copy of most configuration files Device names are consistent cluster-wide u Storage devices are available everywhere u Fewer things to manage u l l u Single security domain l u Operating system and applications installed once per cluster Automatic disk and file system failover Base and Enhanced Security BUT… Still must manage some things separately l l l Kernel tuning, process tuning Network adapter, tty configuration Licensing Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Application Support Binary compatibility with Tru 64 UNIX V 5. 0 u Applications need only be installed once in the cluster although may be licensed per node u Single instance applications u l u Multiple instance applications l u May only run on one member of a cluster at a time – Multiple copies would conflict with each other – Typical old-style ASE applications May run on multiple or all cluster members – Multiple copies don’t conflict – Some ASE applications can now run on multiple members Cluster aware applications l Use cluster features such as the Distributed Lock Copyright © 2003 Digitask Consultants Inc. , All rights reserved Manager

Cluster File System u Single cluster-wide namespace with a single shared root / Same view from all cluster members l Mechanism to address member-specific files l /usr /var /. . . Client/Server Model Initially u Layers on existing file system types u /. . . l /. . . Adv. FS, NFS, UFS (r/o), CDFS Transparent file system failover and recovery u Integrated with Cluster Alias for NFS server u Copyright © 2003 Digitask Consultants Inc. , All rights reserved 9

Cluster Application Availability Provides application failover or restart within the cluster u Application and Resource dependencies u Application profile determines failover policy and dependencies u Mechanism for application-specific monitoring u l Monitoring of applications via ‘check’ entry in action script Command line and GUI-based management u ASE application start/stop scripts easily migrate with minimal changes u Copyright © 2003 Digitask Consultants Inc. , All rights reserved

Cluster Alias Client Router u u u u Cluster appears as single system to network Can support multiple aliases Single host name to clients Transparent handling of node and adapter failures Dynamic load balancing Network services Efficient forwarding over cluster interconnect Cluster - canine 1. 1. 1. 0 Retriever Alpha. Server labrador 1. 1 Alpha. Server golden 1. 1. 1. 2 Alpha. Server basset 1. 1. 1. 3 Alpha. Server bluetick 1. 1. 1. 4 Hound Copyright © 2003 Digitask Consultants Inc. , All rights reserved