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Nathaniel CooperOct 14, 2019 12:18:31 PM< 1 min read

What is better RAID 5 or RAID 6?

RAID5 tends to offer the fastest read and write performance, while maintaining a fairly strong raw to usable data percentage.  Usually ranging from 85-90% raw to usable.


RAID6 offers great read and write performance, and depending on your RAID controller, buffering and settings performance can be close to RAID5.  In some cases even beyond a RAID5.  However raw to usable capacity is slightly lower ranging from 75%-85%.


RAID5 allows for a single drive to fail without any data loss.  RAID6 allows for two drive failures without any data loss.


RAID5 rebuild times tend to be quite a bit faster, ranging from 50% to 200% faster, depending on capacity, RAID controller and the amount of data you have.


Neither is better or worse, but in generally RAID5 will give you a little more storage, performance and faster rebuilds and RAID6 will give you more data protection.


My personal favorite set up is a SSD based RAID6, it's maximizes performance, rebuild times and data protection.


Nathaniel Cooper

As Chief Operating Officer of ProMAX Systems, Nathaniel Cooper, runs ProMAX Systems day to day operations. Cooper has been working with Storage, Backup and Media Management for video and creative professionals since 2001. Cooper has lead the design and deployment of some of the largest media systems in the world including a range of customers from NFL, MLB & NBA teams, US Military operations, and many of the worlds largest PR agencies and consumer brands. Cooper has spent the last 9 years as part of the ProMAX team and specializes in translating complex technical issues and options into easily understandable concepts.