1. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Practical High Availability NAS Cost-effective, non-stop disk access for clustered file shares

2. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Problem: Cost to achieve necessary redundancy & speed can be prohibitive Alternative: Extend DataCore storage virtualization servers into high-availability (HA) NAS role Couple SANsymphony-V storage hypervisor features with Windows Server 2008 R2 NFS/SMB file sharing & clustering capabilities in Enterprise Edition No additional software required Combine into unified HA storage solution (SAN/NAS) Availability & performance of file shares has become mission critical 2

3. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Compelling value FEATURE Clustered file shares Synchronous mirroring w/ automatic non-disruptive failover Redundant NAS servers up to 100 km apart Thin provisioning Cache acceleration Remote replication BENEFIT Business continuity & HA Avoid storage-related downtime Minimize impact of equipment & facility problems Maximize space utilization Faster performance Extend protection for disaster avoidance & recovery

4. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Windows NAS (a.k.a. File Server) 4 filestore /home Host NFS / SMB NAS

5. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. NAS server outage affects everyone 5 filestore /home Host NFS / SMB NAS

6. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Clustered servers help, but … Failover Clustering /home Host NFS / SMB Server 1 Server 2 NAS Shared disk access remains a single point of failure! witnessfilestore Shared disks

7. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Solution: Full redundancy Failover Clustering /home Host NFS / SMB Server 1 Server 2 NAS witnessfilestorewitnessfilestore witnessfilestore Room 1 Room 2 Shared virtual disks Mirrored copies Primary disks

8. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Non-stop, high-availability NAS /home witness filestore SAN witness filestore Cache /home NFS / SMB Host Failover Clustering Synchronous Mirroring NAS Room 1Room 2 Mirrored copies Primary disks

9. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Non-disruptive failover /home witness filestore SAN witness filestore Cache /home NFS / SMB Host Failover Clustering Synchronous Mirroring Room 1Room 2 NFS / SMB NAS Mirrored copies Primary disks

10. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Automatic failback /home witness filestore SAN witness filestore Cache /home NFS / SMB Host Failover Clustering Synchronous Mirroring NAS Room 1Room 2 Mirrored copies Primary disks

11. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Plus I/O acceleration disk drives Disk Drive 4000 – 6000 DataCore L1 Cache <20 Array L2 Cache 250 – 300 Avg. Response (µS) High-Speed Level 1 Caching CPU Up to 1 TB RAM cache per node CPU 11 Virtual Disks Output from Cache Poll for Input Write Coalesce Pre-fetch

12. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Works for virtual machines (VMs) too 12 Virtual iSCSI SAN witnessfilestore Hyper-V VM Virtual iSCSI SAN witnessfilestore Hyper-V VM Failover Clustering Disk Drives D2D1 Disk Drives D2D1 Cache /home NFS / SMB iSCSI Initiator Synchronous Mirroring NAS App Room 1Room 2 App VM App VM Mirrored copies Primary disks

13. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. NAS failover with Hyper-V 13 Virtual iSCSI SAN witnessfilestore Hyper-V Virtual iSCSI SAN witnessfilestore Hyper-V VM Failover Clustering Disk Drives D2D1 Disk Drives D2D1 Cache /home NFS / SMB iSCSI Initiator Synchronous Mirroring NAS App Room 1Room 2 App VM App VM NFS / SMB iSCSI Initiator Mirrored copies Primary disks

14. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Co-resident HA SAN/NAS: Compact clustered servers solution /home Virtual Disks Disk Drives witness filestore D2D1 Initiator Disks SAN Virtual Disks Disk Drives witness filestore D2D1 Disks SAN Cache /home NFS / SMB Host Target Initiator iSCSI Failover Clustering Synchronous Mirroring NAS

15. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. SAN failover Disk Drives D1 Disk Drives D2D1 Virtual Disk Cache Synchronous Mirroring Host Alternate Path MPIO Preferred Path D2 Virtual Disk(mirror)

16. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Expandable to separate NAS & SAN servers 16 witnessfilestore witnessfilestore Failover Clustering Disk Drives D2D1 Disk Drives D2D1 Cache /home Host NFS / SMB Synchronous Mirroring Server 1 (NAS) Server 2 (NAS) Server 3 (SAN) Server 4 (SAN) NAS

17. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. Implementation guidelines DataCore resides on parent partition Virtualize & cache data drives Enable thin provisioning Place NAS servers in different rooms Stretch distance between them up to 100 km Synchronously mirror across nodes

18. Copyright © 2012 DataCore Software Corp. – All Rights Reserved. www.datacore.com