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Storage as a Service andOpenStackSajid AkhtarTME – OpenSource CloudSolution@mail2fashion 1
Cloud storage subscription growth statistics are huge 2
Storage as a Service CAPEX to OPEX based business model. Manage storage by well-defined set of remotely Accessible APIs Abstracts the actual storage implementation This service offers specialized functions: DR, backup, document sharing, etc.Using Storage as a Service Object Block File Ephemeral 3
What Is OpenStack?Global collaboration Developers Cloud computing technologists Open source cloud computing platform - Public clouds - Private clouds Solutions for all types of clouds Simple to implement Massively scalable Feature rich 4
Quick OpenStack OverviewAn Open Source Cloud Computing Platform Provides for all types of clouds – Simple – Scalable – Feature rich Total cloud infrastructure solution – Combination of interrelated projects Open source software around 3 years old OpenStack Foundation established 2012 Over 700+ organizations contributing to development Established and growing number of production deployments 5
Type of storage available on OpenStackEphemeral(On-instance) :-Used for running Operating System and scratch space-Persists until VM is terminated-Access associated with a VM-Implemented as a filesystem underlying OpenStack Compute-Administrator configures size setting, based on flavors-Example: 10GB first disk, 30GB/core second diskFor desktop user PCs internal disk drives are ephemeral;persistent storage can be considered similar to an externalUSB drive. 9
OpenStack Object Storage (Swift)What Is It? Object Storage is ideal for cost effective, scale-out storage. It provides a fully distributed, API-accessible storage platform that can be integrated directly into applications or used for backup, archiving and data retention. Highly available & distributed object / blob store(known as a binary large object, collection of binary data stored as a single entity in a database management system. Blobs are typically images, audio or other multimedia objects) – Ring architecture In production today – Rackspace’s Cloud Files, Internap, Wikimedia Foundation Architectural overview: – http://swift.openstack.org/overview_architecture.html
OpenStack Block Storage (Cinder)What Is It? Block Storage allows block devices to be exposed and connected to compute instances for expanded storage, better performance and integration with enterprise storage platforms. This persistent block level storage devices can be exposed to applications as well. The block storage system manages the creation, attaching and detaching of the block devices to servers. Block storage volumes are fully integrated into OpenStack Compute and the Dashboard allowing for cloud users to manage their own storage needs.
Contd.. This is block storage (or volumes) and currently there are blueprints for filesystems like NFS or CIFS share Persists until deleted Mounted via OpenStack Block-Storage controlled protocol (for example, iSCSI, LVM) Sizings based on need Example: 1TB "extra hard drive"
Cinder (Contd.) cinder-api accepts API requests and routes them to cinder-volume for action. cinder-volume acts upon the requests by reading or writing to the Cinder database to maintain state, interacting with other processes (like cinder-scheduler) through a message queue and directly upon block storage providing hardware or software. It can interact with a variety of storage providers through a driver architecture. Currently, there are drivers for IBM, SolidFire, NetApp, Nexenta, Zadara, linux iSCSI and other storage providers. Much like nova-scheduler, the cinder-scheduler daemon picks the optimal block storage provider node to create the volume on. Cinder deployments will also make use of a messaging queue to route information between the cinder processes as well as a database to store volume state.
Minimum Driver Features In order to be accepted for a given milestone release, Cinder driver must implement the following features Grizzly Release: – Volume Create/Delete – Volume Attach/Detach – Snapshot Create/Delete – Create Volume from Snapshot – Get Volume Stats (driver_version/ free_capacity_gb /reserved_percentage /storage_protocol /total_capacity_gb /vendor_name /volume_backend_name )
Filesystem as a service – basic idea NAS shares to share data across VM instances – Brings the benefits of shared storage to OpenStack Simple and widely accepted protocols – NFS and CIFS 17
Filesystem as a service Storage Controller S1 S2 VM1 VM2 Hypervisor 18
Why filesystems? NAS – built to share storage – CIFS/NFS – In-built locking, sharing and permissions – Metadata stored with data Cheap! Legacy applications Applications in scalable compute 19
Use case Simple: sharing data across VMs – Can use as isolated disk too! Migration – VM crashes doesn’t affect stored data Scalable compute with shared storage – Parallel compilation of large C/C++ projects – Rendering pipelines for animation studios and electronic chip design workloads 20
OpenStack Massively scalable, open source cloud operating systems – Compute (Nova) – Object Storage (Swift) – Block Storage + File Storage? (Cinder) – Imaging service (Glance) – Dashboard (Horizon) – Network (Quantum) – File Storage (New project) ? 21
Current implementation Separate service inside Cinder Shares API – Share create/delete – Share Snapshot create/delete – Allow/Deny access – Publish capabilities to scheduler 22
Quick references for Cinder Source code: https://github.com/openstack/cinder Bug tracker: https://bugs.launchpad.net/cinder Blueprints: https://blueprints.launchpad.net/cinder Developer doc: http://docs.openstack.org/developer/cinder/ API complete reference: http://api.openstack.org/api-ref.html
How to start contributing ?• Become a member and create profile : https://www.openstack.org/join• Sign User license• Create launchpad account and review the projects .• Openstack Wiki : http://wiki.openstack.org/• Join IRC channel and register to OpenStack mailing list. 25