software defined storage with gluster - snia · pdf fileagenda software defined storage (sds)...
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Software Defined Storage with Gluster
Vijay Bellur Lead Gluster Architect Red Hat Twitter: @vbellur
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Agenda
● Software Defined Storage (SDS)
● Gluster as SDS - 4Ws and a H ● Why Gluster?
● What is Gluster?
● How does Gluster work?
● Where is Gluster used?
● What next in Gluster?
● Q & A
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What is Software Defined Storage?
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What is Software Defined Storage?
● All Storage Solutions have Software!
● General Consensus -
● “Marketing buzzword” [1].
● Evolving terminology
[1] http://www.snia.org/sites/default/files/SNIA%20Software%20Defined%20Storage%20White%20Paper-%20v1.0k-DRAFT.pdf
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SDS - Characteristics
● Runs on Commodity Hardware
● Scale-out with resource aggregation
● Elasticity
● Automated Management
● Various data services
● Storage as a Platform & Storage as a Service
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SDS with Gluster
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Why Gluster?
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Why Gluster?
● 2.5+ exabytes of data produced every day!
● 90% of data in last two years
● Data needs to be stored somewhere
● Often data needs to outlive us!
source: http://www-01.ibm.com/software/data/bigdata/what-is-big-data.html
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What is Gluster?
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What is Gluster?
● Open Scale-out distributed storage system.
● Aggregates storage exports over network interconnects to provide an unified namespace.
● Layered on disk file systems that support extended attributes.
● Provides file, object and block interfaces for data access.
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How does Gluster work?
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Typical Gluster Deployment
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Gluster Architecture – Foundations
● Software only, runs on commodity hardware ● Scale-out with Elasticity ● Extensible and modular ● Deployment agnostic ● No external metadata servers
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Gluster Volumes
● Logical collection of exports (bricks) from various servers
● Default entity for storage policy definition
● Volume or a part of the volume can be accessed by clients
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Volume Types Volume type determines:
➢ Data Placement ➢ Redundancy ➢ More..
Available volume types:
- Distribute - Striped - Replicated - Distributed Replicate - Striped Replicate - Distributed Striped Replicate - Dispersed
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Distributed Volume ➢Distributes files across various bricks of the volume.
➢Directories are present on all bricks of the volume.
➢Removes the need for an external meta data server, provides
O(1) lookup.
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Replicated Volume
● Synchronous replication of all updates.
● Provides HA for data.
● Transaction driven for ensuring consistency.
● Changelogs maintained for re-conciliation.
● Any number of replicas can be configured.
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How does a replicated volume work?
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Distributed Replicated Volume
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Dispersed Volume
● Erasure Coding / RAID 5 over the network
● “Disperses” data on to various bricks
● Algorithm: Reed solomon
● Non–systematic erasure coding
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Access Mechanisms
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Access Mechanisms
Gluster volumes can be accessed via the following mechanisms:
● FUSE based Native protocol
● NFSv3
● SMB
● libgfapi
● ReST/HTTP (object)
● HDFS
● iSCSI (block)
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FUSE based native access
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libgfapi access
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NFSv3 access with Gluster NFS
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Nfs-Ganesha with Gluster
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SMB with Gluster
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Object/ReST - SwiftonFile
Client Proxy Account
Container
Object
HTTP Request ( Swift REST API)
Directory
Volume
File Client NFS or
GlusterFS Mount
● Unified File and object view ● Entity mapping between file and object building blocks
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HDFS access
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Block/iSCSi access
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Gluster Features
● Scale-out NAS
● Elasticity
● Directory, Volume & Inode quotas
● Data Protection and Recovery
● Volume and File Snapshots
● User Serviceable Snapshots
● Geographic/Asynchronous replication
● Archival
● Read-only
● WORM
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Gluster Features
● Isolation for multi-tenancy
● SSL based data transfer
● Encryption at rest
● Performance
● Client side in memory caching for performance
● Data, metadata and readdir caching
● Monitoring
● Built in io statistics
● /proc like interface for introspection
● Provisioning
● puppet-gluster
● gluster-deploy
● More..
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Web based Management - oVirt
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Gluster Monitoring with Nagios
http://www.ovirt.org/Features/Nagios_Integration
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How is it implemented?
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Translators in Gluster
● Building blocks for a Gluster process.
● Based on Translators in GNU HURD.
● Each translator is a functional unit.
● Translators can be stacked together for achieving desired functionality.
● Translators are deployment agnostic – can be loaded in either the client or server stacks.
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Customizable Translator Stack
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Where is Gluster used?
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Gluster Use Cases
Source: 2014 GlusterFS user survey
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Ecosystem Integration
● Currently used with various ecosystem projects
● Virtualization ● OpenStack
● oVirt
● Qemu
● CloudStack
● Big Data Analytics ● Hadoop
● Tachyon
● File Sync and Share ● ownCloud
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Nova Nodes (Gluster as ephemeral
storage)
Swift Objects
Cinder Data Glance Data
Swift Data
Swift API
Storage Server
(GlusterFS)
Storage Server
(GlusterFS)
Storage Server
(GlusterFS)
KVM
KVM
KVM
… Fuse/libgfapi
Manila Data
Storage Server
(GlusterFS)
Block Images Files Objects
Openstack Kilo + Gluster – Current Integration
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What next in Gluster?
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New Features in GlusterFS 3.7
● Data Tiering
● Bitrot detection
● Sharding
● NFSv4, 4.1 and pNFS access using NFS Ganesha
● Netgroups style configuration for NFS
● Performance improvements
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Features beyond GlusterFS 3.7
● HyperConvergence with oVirt
● Compression at rest
● De-duplication
● Multi-protocol support with NFS, FUSE and SMB
● Native ReST APIs for gluster management
● More integration with OpenStack, Containers
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Hyperconverged oVirt – Gluster
● Server nodes are used both for virtualization and serving replicated images from Gluster Volumes
● Support for both scaling up, adding more disks, and scaling out, adding more hosts
VM
s an
d S
tora
ge
Eng
ine
GlusterFS Volume
Bricks Bricks Bricks
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Gluster Native Driver – OpenStack Manila
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Gluster 4.0
● Not Evolutionary anymore
● Intended for massive scalability and manageability improvements, remove known bottlenecks
● Make it easier for devops to provison, manage and monitor
● Enable larger deployments and new use cases
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Gluster 4.0
● New Style Replication
● Improved Distributed hashing Translator
● Composite operations in the GlusterFS RPC protocol
● Support for multiple networks
● Coherent client-side caching
● Advanced data tiering
● ... and much more
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Resources Mailing lists: [email protected] [email protected] IRC: #gluster and #gluster-dev on freenode Web: http://www.gluster.org
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Conclusions
● SDS evolution on the way
● Data explosion unbounded
● Great time to be in Storage!
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Thank you!