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NETE4631Working with Cloud-based Storage

Lecture Notes #11

Mobile Cloud Computing - Recap

Mobile cloud computing A model where processing is done in the

cloud, data is stored in the cloud, mobiles device serves as a presentation platform or a display

Advantage of cloud apps to mobile cloud Thinner devices -> less processing,

consume less power, and have better battery life

Avoidance of vendor lock-in.

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Securing Approach – Recap (2)

Mobile web service are those in which information is transferred between applications (browser) and services over the internet.

WS-Discovery from OASIS Standard WSDL (Web Service Description

Language) UDDI (Universal Description, Discovery,

and Integration) SOAP (Simple Object Access Protocol)

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BlackBerry Push Service – Recap (3)

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Lecture Outline Measuring the digital universe Provisioning cloud storage Creating cloud storage systems Cloud backup solutions Cloud storage interoperability

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Measuring the Digital Universe

Facts of hunger for storage An email with a 1GB attachment to 3 people can

generate an estimated 50GB of stored managed data. Only 25% of the data stored is unique, while 75% of

the data stored is duplicated. 70% of the data stored in the world is used initiated. More than 50% of the data created everyday is the

data that is automatically generated, especially from video cameras and surveillance photos, financial transaction event logs, performance data and so on.

Much of the data produced is temporal, and deleted.

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EMC’s Digital Universe Homepage

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Cloud Storage Data Usage in 2020

By International Data Corporation, Digital Universe, May 2010

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Provisioning Cloud Storage

IaaS model Storage accessed by Web service API Cloudy characteristics

Network access most often through browser On-demand provisioning User control

SaaS model Software package on top of cloud

storage for backup, synchronization, archiving, etc.

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Storage Devices Block storage device

Raw storage that can create volumes Data is transferred in blocks Example, hard disk, flash drives Faster data transfers/ additional overhead on

clients File storage device

Expose its storage to client in a form of files Example, file server, most often in the form of

Network Attached Storage (NAS) devise Slower transfers/ less overhead from clients

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Cloud Storage Types Unmanaged storage

Preconfigured storage (limited level of mgt) Cannot (1) format as your like, (2) install your own file

system (FAT, NTFS), and (3) change drive properties (compression, encryption)

Reliable, relatively cheap, easy to work with

Managed storage Provided as a raw disk

Can (1) format and partition the disk, (2) attach or mount the disk, and (3) make storage assets available to applications and other users

Support applications built using Web services

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Dropbox – File Transfer Utility

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Amazon S3 and Rackspace Cloud

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Creating Cloud Storage Systems

Concepts Multiple copies of data are stored on

multiple servers and in multiple locations Storage virtualization software

Failover - > changing the pointers to the stored object’s location

Example Amazon Web Service (EC2, S3) supports

“failover” / load balancing ->but you must purchase these features

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ByCast’s StorageGRID

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Evaluating Cloud Storage

Important considerations Client self-service Strong management capabilities

Scale up – more disks Scale out – additional storage systems

Performance characteristics such as throughput

Block-based or file-based protocol support

Seamless maintenance and upgrades16

Cloud Backup Solutions Last line of defense in a strong backup

routine Backup types

Full system or image backups Point-in-time (PIT) backups or snapshots

Incremental backups

3-2-1 Backup rule 3 copies (1 primary and 2 backups) 2 different media 1 copy should be stored offside

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Cloud Backup Features Logon authentication High encryption of data transfers Automated and scheduled backup Fast backup (snapshots) after full

online backup, with 10-30 historical versions of a file retained

Ability to retrieve historical versions of file

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Cloud Backup Features (2) Multiplatform support Web-based management console 24x7 technical support Logging and reporting of

operations Multisite storage or replication,

enabling data failover

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Cloud Attached Backup

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Cloud Storage Interoperability

Open standards (operating-system neutral and file-system neutral)

Workgroups Cloud Data Management Interface

(CDMI) from Storage Networking Industry Association (SNIA)

http://www.snia.org Open Cloud Computing Interface (OCCI)

from SNIA and Open Grid Forum (OGF) http://www.ogf.org

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References

Chapter 15 of Course Book: Cloud Computing Bible, 2011, Wiley Publishing Inc.

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