Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Upgrade MacBook Pro Retina SSD
Internal SSD Wishlist…

Using High Capacity Drives as RAID-4 / RAID-5, Multiple Volumes

Last updated 2015-11-11 - Send Feedback
Related: how-to, Storage, storage, RAID

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

See the topology overview which discusses general considerations in using four or five or more large hard drives.

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

Example: three ~10TB volumes using five 8TB hard drives

This configuration requires two OWC Thunderbay 4 units, since one unit houses four drives, and there are five drives involved.

This example could be extended to six or move drives for the RAID, but by intention that is not chosen. Instead, those three additional drive slots in the 2nd Thunderbay can be utilized for single-drive nearline (always attached) daily clone backups, e.g., volumes MainClone, VideoClone, ArchivedClone corresponding to the Main, Video, Archived master volumes.

The use of 10TB volumes using five drives is a forward-looking configuration that anticipates 10TB hard drives. By using five 8TB drives, three ~10TB volumes can be created which then match in capacity for clone backups, anticipating reasonably priced 10TB drives 12-18 months later. Since capacity usage is not likely to exceed 8TB over that time (for your author’s system), this strategy delivers both (a) higher performance from 5 drives instead of 4 and (b) 2+ years before the capacity has to be increased again.

The multi-volume approach has a distinct advantage when it comes to backup: single drives of lower-capacity can be used so long as the data fits, e.g., 5TB or 6TB drives until such time as the master volume exceeds that usage. Moreover, if one of the volumes is not in use (future capacity), it need not be backed-up at all.

Only volumes that have changed content need be backed up again. Here, Archive might not change for long periods, since presumably it is older material that is not being modified. Thus, backup can be optimized by not needlessly iterating over 10/15/20 TB of data.

TIP: use diglloydTools IntegrityChecker to verify backup integrity.

Finder Info for four ~10TB RAID-4 volumes via SoftRAID, using five HGST Ultrastar He8 8TB hard drives
SoftRAID view of Four ~10TB RAID-4 volumes via SoftRAID, using five HGST Ultrastar He8 8TB hard drives
ThunderBay 4 - The Speed To Create. The Capacity To Dream.
Storage Wishlist…
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 13 hours unless noted. Certain deals may last longer.
$2299 SAVE $500 = 17.0% Canon EOS 5D Mark III DSLR in Cameras: DSLR
$2698 SAVE $300 = 10.0% Sony a7R II Mirrorless in Cameras: Mirrorless

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2008-2017 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__