Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Get up to 16x more storage and 2x the speeds of the original drive

RAID-5 vs RAID-4 with SSDs

OWC Thunderbay Mini

Thunderbay Mini configurations start at about $379 without drives. Thunderbay Mini RAID-5 edition also available.

RAID-4 is striping with a dedicated parity drive
RAID-5 is striping with distributed parity

MPG tested the throughput of the OWC Thunderbay 4 Mini using DiskTester run-sequential-suite on a late 2013 MacBook Pro Retina (Thunderbolt 2).

disktester run-sequential-suite --xfer-steps 4 --test-size 2G--starting-xfer 64K --ending-xfer 256MB

With 4 OWC Mercury Extreme Pro 6G SSDs, RAID-4 outperforms RAID-5 by about 10% for reads (compare green and blue lines). Write performance is identical.

Findings might or might apply to hard drives, whose performance characteristics differ from SSDs.

OWC Thunderbay Mini performance: 4 OWC 6G SSDs, RAID-4 vs RAID-5 for varying transfer size

Filling the entire volume with disktester fill-volume, observe that write speed for RAID-4 and RAID-5 is identical on SSDs. But read speed is about 12% higher for RAID-4.

disktester fill-volume --xfer 128M

OWC Thunderbay Mini performance: 4 OWC 6G SSDs, RAID-4 vs RAID-5 sustained transfer speed
Apple MacBook 12-inch, Mid 2017 (Current Model)

$1599 Only $999

1.3 GHz i5, 8GB, 512GB SSD
Apple Refurbished, Factory Sealed, Apple 1 Year Limited Warranty
128GB Memory in iMac 5K

Up to 128GB for 2019 iMac 5K!
Up to 64GB for 2015/2017 iMac 5K

Save nearly 50% over Apple pricing

Deals Updated Daily at B&H Photo
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 21 hours unless noted. Certain deals may last longer.
$2797 SAVE $600 = 17.0% Nikon Z 7 Mirrorless in Cameras: Mirrorless
$2798 SAVE $400 = 12.0% Sony a7R III Mirrorless in Cameras: Mirrorless
$3498 SAVE $1000 = 22.0% Sony a9 Mirrorless in Cameras: Mirrorless
$898 SAVE $100 = 10.0% $164 FREE ITEMS Sony DSC-RX100 VA in Cameras: Point and Shoot
$1879 SAVE $1071 = 36.0% ZEISS 15mm f/2.8 Distagon T* ZE in Lenses: DSLR

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__