All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com

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.
Upgrade the memory of your 2020 iMac up to 128GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$4499 $2999
SAVE $1500

$799 $429
SAVE $370

$149 $99
SAVE $50

$2198 $1798
SAVE $400

$80 $28
SAVE $52

$3498 $2998
SAVE $500

$2999 $1699
SAVE $1300

$2397 $2197
SAVE $200

$1697 $1297
SAVE $400

$2998 $2898
SAVE $100

$2198 $1798
SAVE $400

$190 $161
SAVE $28

$580 $450
SAVE $130

$2997 $2697
SAVE $300

$1799 $1599
SAVE $200

$2198 $1998
SAVE $200

OWC Black Friday

Best Deals of the Year!


Promo code BFCM2021 good thru Nov 30
Check for new deals daily!

Testing Multiple Drives for Consistency for a RAID or Similar

diglloydTools

Among its many features, diglloydTools DiskTester offers a run-area-test command that can be used for relatively fast characterization of drive performance across its capacity. The results can be graphed to get a good idea of the drive performance.

For example, suppose a high performance RAID is envisioned: one laggard can cut the performance, since the slowest drive determines the peak speed.

As shown below, 8 samples were tested, and one of those eight is a significant laggard; this slower drive is best set aside as a cold spare or backup drive.

While DiskTester can test any number of drives simultaneously (via command line), testing should take care not to saturate the bandwidth; for example four fast hard drives can demand almost all of the Thunderbolt v1 bandwidth, and other devices on the bus could suck up bandwidth, disturbing the results.

Purchase diglloydTools

Click for larger graph.

diglloydTools DiskTester: performance across volume capacity for eight drives
disktester run-area-test --iterations 5 --test-size 4G --delta-percent 5

Deals Updated Daily at B&H Photo

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__