Storage Foundation Cluster File System

1. Storage Foundation Cluster File System

2. Storage Network Storage Network How do you want to manage your servers? COMPLEX SIMPLE Cluster File System Cluster Volume Manager

3. Storage Foundation Cluster File System HA Storage Foundation Cluster File System VCS Cluster VolumeManager Cluster FileSystem Comprehensive Cluster Management • Concurrent read/write access • File System Management • Dynamic file system resize • Large file system support • Journaling File System • POSIX compliant • Integrated Cluster Management • Cluster File System • Cluster Volume Manager • Veritas Cluster Server • Heterogeneous • Linux, Solaris, HP, AIX

4. Metadata Data Cluster File System Architecture Primary Server Secondary Server • Extends Local File System Functionality • Asymmetric topology • Servers access data directly • Primary Server manages metadata updates • Automated Primary Server failover • Fast application failover Storage Network

5. Technical Overview CVM CFS Cluster File System (CFS) • Global Lock Manager. • Cache coherency • Distributed lock management Cluster Volume Manager (CVM) • Provides shared access to volumes from multiple nodes Global Atomic Broadcast (GAB) • Cluster Membership and messaging Low Latency Transportation (LLT) • Low latency inter-node communication kmsg vxconfig GLM Qlog GAB LLT LLT GAB kmsg vxconfig GLM Qlog CVM CFS

6. Why Veritas Cluster File System? • Prevent Split Brain with I/O Fencing • Avoid Exclusive Locks with Range Locking • Utilize multiple HBA’s with Cluster DMP • Manage Application Failover with Cluster Server

7. Understanding Split Brain • Split Brain can cause data corruption • One node must survive, the other must be shutdown • VERITAS I/O Fencing handles all scenarios Network failure or system failure? System failure or system hang?

8. 1 3 4 2 Eject departed node from coordinator disks Ejected node can not write to disks Eject departed node from data disks I/O Fencing: How Does it Work

9. Exclusive locking Node 1 – Writer with an exclusive lock Node 2 – Writer waiting for lock to be released File foo.bar Appending writes, e.g. a log file Lock held by node 1, other nodes do not have access until the lock is released

10. Range Locking Node 1 - Writer Node 2 - Writer Appending writes, e.g. data ingest File foo.bar Available for read or write by any nodes Lock held by node 1, other nodes do not have access

11. Cluster Dynamic Multi-Pathing • Dynamic Multi-Pathing (DMP) provides multiple paths from server to storage • Path load balancing improves I/O bandwidth, spreading I/O across connections • Path failover increases application availability • Alerts cluster of failed path Storage Network

12. Storage Network Application Failover • VERITAS Cluster Server used for application failover • Full range of Enterprise Agents available • Faster failover Oracle Oracle Apache VCS VCS VCS Cluster File System Cluster Volume Manager

13. Advanced File System Features

14. Use Cases • Oracle RAC • Scale-out NFS, FTP • Middleware/Message passing/Workflow applications • Web Servers (Single content image) • Databases - single instance, faster failover • Data Capture / Data Warehouse • Billing • Finance • Telemetry • Government

15. Summary • Better Scalability • Concurrent file access • Provision of a data virtualization layer • Quick and Non-Disruptive Failover • Really fast application failover • Automated primary server failover • Ease of Management • Storage for all Servers administered as a single entity • Single file system schema • Flexible Deployment of Applications • Manage all instances of the app simultaneously

16. Thank You!