Why SSDs Don't Perform
by Robin Harris
ZDNet.com, Storage Mojo.com, Usenix.org News ISBN/ITEM#: CM150527PERFORM
Date: 27 May 2015
Who knew that Solid-State Drives (SSDs) were so finicky in how they should be used. We know that the earliest models had their quirks, but thought that was just the teething problems typical of any new products but as new generations are being introduced, we're finding that even now so-called "improper" usage of an SSD can waste most of its performanceFrom release/information:
Summary: From their earliest days, people have reported that SSDs were not providing the performance they expected. As SSDs age, for instance, they get slower. Here's why.
SSDs are a new and evolving (and the SATA versions are already obsolete) technology. It's not surprising that we're still learning how and where to use them.
One of the most popular uses of SSDs is in servers hosting virtual machines. The aggregated VMs create the I/O blender effect, which SSDs handle a lot better than disks do.
But they're far from perfect, as a Usenix FAST 15 paper Towards SLO Complying SSDs Through OPS Isolation by Jaeho Kim and Donghee Lee of the University of Seoul and Sam H. Noh of Hongik University points out:
In this paper, we show through empirical evaluation that performance SLOs cannot be satisfied with current commercial SSDs.
(Source: ZDNet.com, Storage Mojo.com, Usenix.org)
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