System News
IT - Storage
1 Dec 2016
Enterprise SSDs and Storage Design
Enterprise Storage Forum, December 1st, 2016

"Solid State Drives (SSDs) have been around a lot longer than you think. Their current popularity started a few years ago with small-capacity, expensive drives. They had much better performance than spinning drives, and this proved important in a number of areas. They also boasted low power draw and insensitivity to shock (i.e., you could shake them while running and they would not crash or lose data).

However, they were far from perfect. The initial capacities were small, the price per GB was much, much larger than for spinning drives, and they had some peculiarities relative to spinning disks that people had to come to understand. Some of these included the following:..."
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28 Nov 2016
Why Do We still Rebuild RAID Drives?
ZDnet, November 28th, 2016

"Worried about the days long rebuild times of 6, 8, or even 10TB drives? Don't be. Object storage is getting rid of that relic of the 25-year-old RAID architecture. Here's how it works...

RAID arrays are designed to allow one or two individual drives to fail without losing access to the data. Parity data is added to your data to enable data access even after drive failure(s).

The parity+data bits are spread across the drives. The smallest RAID arrays are 4 drives, but 6-8 drives in a RAID stripe is most common. With RAID 5, one drive's worth of capacity is dedicated to parity, while in RAID 6 two drive's worth are..."
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