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Bcache Testing: Large Files and a Wrap-Up

Oct 01, 2010, 04:32 (0 Talkback[s])
(Other stories by Jeffrey B. Layton)

"This month we have been testing a new kernel patch named bcache that takes SSDs and uses them as a cache for block devices (with the typical device being hard drives). This article wraps up the testing with an investigation of the throughput of large files and summarizes all the testing to date (and there's a lot of that).

"Introduction

"This is the fourth article in the testing series of a new kernel patch called bcache. The really cool thing about bcache — and the reason I've spent so much time on it — is that it takes one block device and allows it to be a cache for a second block device. What makes this special is that it is intended to take SSD's and make them cache devices for hard drives or RAID arrays. Conceptually you could take a few inexpensive SSD devices that cost around $100-$150 each, create a RAID-0 array, and use it to cache a RAID-6 or even a RAID-5 array. I have waited for a long time for the ability to cache hard drives using something like an SSD or even a ramdisk to really improve storage performance when performance is the most critical item (and, honestly, who doesn't like performance?)."

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