PART 1: Breaking the Connections

Transcription

1 STORAGE VIRTUALIZATION SEMINAR PRESENTATION DOWNLOAD presented by PART 1: Breaking the Connections Storage virtualization is here, breaking the connection between physical storage infrastructure and the logical way we use it

2 Part 1: Breaking the Connections Storage virtualization is here, breaking the connection between physical storage infrastructure and the logical way we use it

3 Agenda What is storage virtualization? Volume management Advanced file systems Virtualizing the SAN Virtual NAS

4 You ve Already Gone Virtual! We talk about virtualization like it is new or strange but your storage is already virtualized! Disk drives map blocks RAID is as old as storage (patented in 1978, defined in 1988) Modern OSes include volume management and path management Network-attached storage (NAS) redirectors and DFS Storage arrays are highly virtualized (clustering, LUN carving, relocation, tiering, etc ) According to ESG, 48% had implemented storage virtualization by 2007, 52% will in 2008! (ESG 2007)

5 SNIA Defines Storage Virtualization 1. The act of abstracting, hiding, or isolating the internal function of a storage (sub)system or service from applications, compute servers or general network resources for the purpose of enabling application and network independent management of storage or data. 2. The application of virtualization to storage services or devices for the purpose of aggregating, hiding complexity or adding new capabilities to lower level storage resources. Storage can be virtualized simultaneously in multiple layers of a system, for instance to create HSM like systems.

6 What and Why? Virtualization removes the hard connection between storage hardware and users Address space is mapped to logical rather than physical locations The virtualizing service consistently maintains this metadata I/O can be redirected to a new physical location We gain by virtualizing Efficiency, flexibility, and scalability Stability, availability, and recoverability

7 SNIA Shared Storage Model IV III Application File/Record Layer Database File System Database Objects Files Volume Management HBA (Server RAID) IIc IIb IIa I Host Block Aggregation Network Device Storage Devices LUN Carving/Masking Zoning Virtual LUNs RAID Groups Physical Storage (Disk/Tape)

8 The Non-Revolution: Storage Virtualization Software We ve been talking about storage virtualization for 15 years! Virtualization exists for both block and file storage networks Can be located in server-based software, on network-based appliances, SAN switches, or integrated with the storage array Can sit in-band or out of the data path Appliance Array Switch

9 Introducing Volume Management Volume managers abstract block storage (LUNs, disks, partitions) into virtual volumes Very common all* modern OSes have volume managers built in Windows Logical Disk Manager, Linux LVM/EVMS, AIX LVM, HP-UX LVM, Solaris Solstice, Veritas Volume Manager Mostly used for flexibility Resize volumes Protect data (RAID) Add capacity (concatenate or expand stripe or RAID) Mirror, snapshot, replicate Migrate data Volume management = server-based storage virtualization

10 Logical Volume Managers Platform Volume Manager Notes AIX Logical Volume Manager OSF LVM, no RAID 5, no copy-on-write snapshots HP-UX 9.0+ HP Logical Volume Manager OSF LVM, no RAID 5 FreeBSD Vinum Volume Manager No copy-on-write snapshots Linux 2.2+ Logical Volume Manager and Enterprise Volume Management System Based on OSF LVM, no RAID 5 Solaris AIX, HP-UX, Linux, Solaris, Windows Windows Solaris, BSD, Mac OS X Solaris Volume Manager (was Solstice DiskSuite) Symantec Veritas Volume Manager (VxVM), Foundation Suite Logical Disk Manager Limited allocation options, no copy-on-write snapshots Full-featured multi-platform volume manager Co-developed with Veritas, limited allocation options, copy-onwrite snapshots introduced in Server 2003 ZFS Combined filesystem and volume manager

11 ZFS: Super File System! ZFS (originally zettabyte file system ) is a combined file system and volume manager Open source (CDDL) project managed by Sun Will probably replace UFS (Sun), HFS+ (Mac) ZFS creates a truly flexible, extensible, and full-featured pool of storage across systems and disks Filesystems contained in zpools on vdevs with striping and optional RAID-Z/Z2 128-bit addresses mean near-infinite capacity (in theory) Blocks are copy-on-write with checksums for snapshots, clones, authentication but there are some limitations Adding (and especially removing) vdevs is hard/impossible Stacked RAID is impossible There is no clustering (until Sun adds Lustre)

12 Path Management Software Path management virtualizes the connection from a server to a storage system Failover Load balancing strategies A few choices Veritas DMP (cross-platform, with Storage Foundation) EMC PowerPath (supports EMC, HDS, IBM, HP) IBM SDD (free for IBM) HDS (HDLM)

13 Virtualizing the SAN The storage area network (SAN) is a popular location for virtualization Can require less reconfiguration and server work Works with all servers and storage (potentially) Resides on appliance or switch placed in the storage network Some are in the data path, others are less so Brocade and Cisco switches have application blades Some use dedicated storage services modules (SSMs)

14 In-Band vs. Out-of-Band In-band devices intercept traffic Out-of-band devices redirect traffic Where s my data? It s over there! Where s my data? I got yer data right here!

15 SAN Virtualization Products Product Architecture Thin Prov. DataCore SANsymphony In-band IP software Yes Yes EMC Invista Out-of-band on FC switch No No FalconStor IPStor In- or out-of-band IP software No Yes IBM SVC In-band FC appliance No Yes Incipient insp Out-of-band on FC switch No No? LSI StoreAge SVM Out-of-band appliance with host software No Repl. Yes Notes Supports SCSI, FC, ATA drives over IP on a Wintel server No caching; supports Cisco & Brocade FC switch blades and SSPs Block-based; supports a variety of drive types on a Wintel server or Cisco FC blade Supports most FC storage; large caches; IBM hardware No caching; supports Cisco FC blades No caching; split-path FC with proprietary SSM Sanrad V-Switch In-band IP appliance No Yes Bridges FC to iscsi

16 Virtual NAS File-based network-attached storage (NAS) lends itself to virtualization IP network connectivity and host processing possibilities Multitude of file servers? Virtualize! Global namespace across all NAS and servers Share excess capacity Transparently migrate data (easier than redirecting users!) Tier files on large shares with variety of data Create multiple virtual file servers

17 NAS Virtualization Products Product Architecture Repl. Notes Microsoft DFS Out-of-band software No EMC Rainfinity In-band appliance or software Yes Brocade StorageX Out-of-band software Yes Windows/SMB only; Server 2003 R2+ enhanced management DFS management DFS and NIS; also does data migration; also NetApp VFM and HDS F5 Acopia In-band appliance Yes Split-path architecture, non-dfs Attune Maestro In-band appliance Yes Windows-focused with replication and snapshots Network Appliance vfiler In-band clustered NAS Yes Clustered NAS head with global namespace ONStor GNS In-band clustered NAS with DFS Yes BlueArc In-band clustered NAS Yes Combines clustered NAS with DFS into a single global namespace Clustered integrated NAS with global namespace

18 Audience Response Question?

19 RESOURCES FROM OUR SPONSOR q New Deployment Methods for Desktops q Storage Virtualization: the What, the Why and the How q Register today for a live Dell EqualLogic PS Series iscsi SAN solution Demo q Inside the Dell EqualLogic PS Series ISCSi Storage Arrays q View Dell EqualLogic's Educational Webcasts About Dell: The Dell EqualLogic PS Series is the industry s leading family of iscsi-based midrange enterprise SAN solutions. Dell provides businesses of all sizes an affordable, easy-to-manage alternative to expensive and complex traditional storage systems, while giving customers a range of choices in performance, capacity, and cost. All PS Series storage arrays come with enterprise storage management features, including remote replication and thin provisioning, as standard features at no additional cost. The PS Series virtual storage architecture enables simple set up, automated management, multiple tiers of storage, on-demand scalability, and seamless interoperability with virtual infrastructure solutions from industry leading technology partners.

20 Don t forget to download the other presentations from STORAGE VIRTUALIZATION SEMINAR PRESENTATION DOWNLOAD PART 2: Storage in the Virtual World Responding to the demands of server, application, and business users with new flexible technologies PART 3: Should You Virtualize? A look at the practical benefits of virtualized storage