Calculating space for parity in RAID-5

To continue reading for free, register below or login

Requires Membership to View

To gain access to this and all member only content, please provide the following information (all fields required):

First Name:
Last Name:
Country: Select... Afghanistan Aland Islands Albania Algeria American Samoa Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory British Virgin Islands Brunei Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, Democratic Republic of Cook Islands Costa Rica Cote D'Ivoire Croatia Cuba Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia, The Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard and McDonald Islands Honduras Hong Kong Hungary Iceland India Indonesia Iran Iraq Ireland Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, North Korea, South Kuwait Kyrgyzstan Laos Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Luxembourg Macau Macedonia Madagascar Malawi Malaysia Maldives Mali Malta Man, Isle of Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Micronesia Moldova Monaco Mongolia Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Northern Mariana Islands Norway Oman Pakistan Palau Palestine Panama Panama Canal Zone Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Qatar Reunion Romania Russia Rwanda Saint Helena Saint Kitts and Nevis Saint Lucia Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia and Montenegro Seychelles Sierra Leone Singapore Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and South Sandwich Islands Spain Sri Lanka Sudan Suriname Svalbard Swaziland Sweden Switzerland Syria Taiwan Tajikistan Tanzania Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu U.S. Minor Outlying Islands Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Vatican City Venezuela Vietnam Virgin Islands Wallis and Futuna Islands Western Sahara Yemen Zambia Zimbabwe
Email Address:

I would like to receive a FREE subscription to Storage magazine online.
YesNo

Do you manage, evaluate, recommend, implement, support or purchase storage products, software or services?
YesNo

What is your average annual expenditure on storage including hardware, software and services?
Please select... $20 million + $10 to $19.9 million $5 to $9.9 million $1 to $4.9 million $500K to $999K $250K to $499K Less than $250K None

What is your role in purchasing?
Technical decision maker
Financial decision maker
Determine need
Evaluate products/services
Recommend and specify products/services
Implement products/services
None

By joining SearchStorage.com you agree to receive email updates from the TechTarget network of sites, including updates on new content, magazine or event notifications, new site launches and market research surveys. Please verify all information and selections above. You may unsubscribe at any time from one or more of the services you have selected by editing your profile or unsubscribing via email.

TechTarget cares about your privacy. Read our Privacy Policy

BROWSE BY TAG Primary Storage or Storage Hardware,   RAID,   Data Storage Management,   Data management tools,   VIEW ALL TAGS

Digg This!     StumbleUpon     Del.icio.us

RELATED CONTENT RAID Pivot3 and Seanodes increase performance, scalability of iSCSI storage products Fujitsu adds DX60 and DX80 midrange disk arrays to Eternus line Storage Decisions Chicago 2009 Session Downloads MAID technology remains underutilized The state of MAID in data centers MAID product roundup The evolution of RAID data protection RAID changes its stripes, but not its value Post-RAID products Faster disk drive rebuilds: Hot Spots RAID Research Data management tools Choosing a storage system for data archiving Podcast: Integrating reporting tools into your storage infrastructure Green storage best practices control costs, increase energy efficiency Tiered storage, data reduction technologies manage capacity growth for companies as IT budgets shrink Hitachi Data Systems (HDS) expands thin provisioning with Storage Reclamation Service and Hitachi Dynamic Provisioning Best practices for effective thin provisioning Storage Decisions Chicago 2009 Session Downloads Storage Decisions Session Downloads: Data Retention & Retrieval Track (Chicago 2009) Storage Decisions Session Downloads: Storage Systems & Storage Management Track (Chicago 2009) IBM writes software to improve data placement on solid-state drives Data management tools Research

RELATED GLOSSARY TERMS Terms from Whatis.com − the technology online dictionary disk cache  (SearchStorage.com) disk duplexing  (SearchStorage.com) disk striping  (SearchStorage.com) double-parity RAID  (SearchStorage.com) hard disk  (SearchStorage.com) hard disk drive  (SearchStorage.com) parity  (SearchStorage.com) RAID  (SearchStorage.com) storage medium  (SearchStorage.com)

RELATED RESOURCES 2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems Search Bitpipe.com for the latest white papers and business webcasts Whatis.com, the online computer dictionary

I just got asked the same question a few weeks ago. In answer to your specific question, 10[x] 146 GB drives in a RAID-5 configuration would provide 1.316 TB of useable space. The way that I figured this out is using a RAID calculator from ibeast that can be found at: http://www.ibeast.com/content/tools/RaidCalc/RaidCalc.asp

Also, a fellow SearchStorage.com expert, Stephen Foskett answered a similar question and provided a formula for calculating disk space on RAID-5 sets: http://searchstorage.techtarget.com/ateQuestionNResponse/0,289625,sid5_cid637415_tax297924,00.html

The space calculation shows that the parity stripe would consume approximately 10% of the overall storage space, or 146 GB of disk space.