HDD

SSDs and RAID

RAID ConfigurationThe SSD Guy has been asked a number of questions lately about SSDs and RAID.  Most of these center around the difference in failure behaviors between SSDs and HDDs – HDDs fail randomly (if ever), while SSDs fail relatively predictably due to wear.

Oddly enough, SSD failures due to wear make them a little friendlier than HDDs.  The wear mechanism is managed by the controller in the SSD.  SSDs have spare blocks, and the controller manages those blocks, so the controller understands exactly how much wear the SSD has undergone and how much room is left before the SSD will start to have difficulties. Continue reading

Are HDDs Obsolete?

This looks like more fun than reading The SSD GuyAn article in the Storage Newsletter caught The SSD Guy’s eye when it ran in July.  The article consisted of a press release followed by an editorial comment:

While hard drives still have the cost advantage, it appears it’s becoming akin to sticking with a horse-drawn buggy in an age of automobiles by arguing that the upfront cost for a car is so much more than the cost of a horse. At some point, it just doesn’t make sense to ride a horse. How soon until the IT world gets there?

Continue reading

When will SSD Prices Drop Below HDD Prices?

From Objective Analysis Report: How PC NAND Will Undermine DRAMThe SSD Guy often hears people ask: “When will SSD prices drop below the prices of HDDs?”

This makes a lot of sense.  After all, NAND flash, which makes up the bulk of the cost of an SSD is renowned for its rapidly-falling prices.

The short answer to this question is: “Never!” Continue reading

An HDD Cache for an SSD?

University of TorontoA colleague – Isilon’s Rob Peglar – pointed out an interesting paper written by researchers at the University of Toronto in collaboration with Microsoft.  The paper makes a case for using an HDD to cache writes to an SSD to improve storage system performance.

“Wait a minute!” you say.  “An HDD as a cache for an SSD?  This can’t be possible!” Continue reading

Thai Flooding and SSDs

Thailand's FlagInSpectrum, a spot market trading firm, shares a viewpoint that the floods in Thailand could increase SSD consumption.

HDD makers have been severely impacted by this disaster, and are projecting lower unit shipments in the fourth quarter as a result. Continue reading