Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
Amazon
As an Amazon Associate I earn from qualifying purchases.
Capacities up to 56TB and speeds up to 1527MB/s
Upgrade the memory of your 2020 iMac up to 128GB

Using 4 or 5 8TB Hard Drives: Singly or RAID and How?

Get HGST 8TB Ultrastar He8 Hard Drive at OWC.
Also utilized in the 32TB OWC Thunderbay 4 RAID-5 edition.

This page and the pages that follow discusses overall considerations for putting 4 or 5 high-capacity hard drives to use in the most appropriate way.

Questions? One-on-one consulting is available with Lloyd.

The pages that follow show various topologies, including single drives as single volumes, one large fault-tolerant volume, or multiple fault-tolerant volumes.

Four drives or five?

Some topologies discussed here require dual OWC Thunderbay 4 units, since one unit houses four drives, and there are five drives involved in some of the configs. The use of five 8TB drives instead of four drives for a RAID-4 or RAID-5 has benefits:

  • Reduces the parity overhead to 20%, down from 25% for a 4-drive config.
  • Increases performance substantially: 5 drives in RAID-4/RAID-5 is roughly the speed of a 4-drive RAID-0 stripe. With a 4-drive setup RAID-4/5 setup, the speed is roughly the speed of a 3-drive stripe. So the performance is about 1/3 faster just by using one more drive.
  • Allows creation of three 10TB partitions from five 8TB drives (10TB is a forward-looking capacity for mid 2016, allowing for several years growth in capacity needs).

Approaches follow on subsequent pages.

View all handpicked deals...

Sony X85J 75" Class HDR 4K UHD Smart LED TV
$1798 $1298
SAVE $500

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__