Cluster Shared Volumes Reborn in Windows Server 2012 Gareth JamesHani AdhamiSenior Consultant WSV423

Manageability Multi-path Masking several LUN’s Flexibility LUN - smallest unit of failover Capacity Poor SAN space utilisation Scalability Complexity with drive letters

Under the hood CSV Architecture

Metadata Shared LUN Shared Storage VHD Read/Write Simultaneous read/write access on all Cluster Nodes Server side metadata synchronisation - Avoids I/O interruptions

Key Takeaways Metadata updates - small operations, infrequent for VMs Parallel metadata updates - non-disruptive for applications

Disk Volume Manager NTFS CSV File System Filter VM Share Server / SMB Node 2 Disk VM Share MUP/RDB SS/SMB Node 1 VM Share MUP/RDB SS/SMB Node 3 Direct I/O CSV VolumeM gr CSV Proxy File System Storage Connection Broken or not present Coordination Node CSV VolumeM gr CSV Proxy File System CSV VolumeM gr CSV Proxy File System CSVFS SAN LBFO/RDMA

demo Setting up Clustered Shared Volumes

Resiliency How CSV Enables Even Higher Availability

VHD VM running on Node 2 is unaffected Coordination Node SAN Connectivity Failure I/O Redirected via network VM’s can then be live migrated to another node with zero client downtime

VHD Volume relocates to a healthy node Brief queuing of I/O while volume ownership is changed Node Failure VM running on Node 2 is unaffected Coordination Node New Coordinator Node

VHD Volume mounted on Node 1 Network Path Connectivity Failure Metadata Updates Rerouted to redundant network Fault-Tolerant TCP connections make a path failure seamless VM running on Node 2 is unaffected

demo Cluster Shared Volume Resiliency

Performance Improved CSV Performance

demo Cluster Shared Volume Block Cache in action

Block level I/O performance parity Direct I/O Remote file system (SMB) performance parity Redirected I/O

2x performance over File System redirection Disk Volume Manager NTFS CSV File System Filter VM Share Server / SMB Node 1 VM Share MUP/RDB SS/SMB Node 2 Storage Connection Broken or not present Coordination Node CSV VolumeMgr CSV Proxy File System CSV VolumeMgr CSV Proxy File System CSVFS LBFO/RDMA Avoids traversing file system stack twice

CSV Streaming I/O Across Multiple Networks Coordinator Node VHD X X VM with I/O being redirected

I/O redirection needed less often CSV Block Level Redirection SMB multi- channel Direct (RDMA) Improved SMB performance ~2% off block Many Pieces Come Together for Radical Improvement

Deployment CSV Deployment Considerations

Backup CSV Backup

INFRASTRUCTURE as a SERVICE

Find Us Later At the ‘Speaker Lounge’ (12:45 – 13:45) Breakout Sessions (session codes and titles) VIR312 - What's New in Windows Server 2012 Hyper-V, Part 1 VIR315 - What's New in Windows Server 2012 Hyper-V, Part 2 VIR314 - WS2012 Hyper-V Live Migration and Live Storage Migration WSV326 - The Path to Continuous Availability with WS2012 WSV332 - Cluster-Aware Updating and the New Generation of WSUS