DAS Is Dead; Long Live DAS!

In a play on the old saying “the king is dead; long live the king!” this post will opine about the current resurgence of locally attached storage in the data center.

Before the emergence of virtualization, as some of you might remember, came the physical server. Yes, folks, we really did have a single machine running a single OS, and we really did have that machine running multiple applications or services. AD with DNS? DHCP and WINS? Not a problem. Also, while you are at it, put certificate management and dogfood on there too. Yep, why not?

Once virtualization started to spread though the computer room—yes it was a computer room—and processor capabilities caught up with the technology, our choke point moved to disk. DAS-based disk just did not allow the sexy stuff like vMotion. Also, the possibility of losing all our machines upon the failure of a single host was, quite rightly, a step too far. Anybody remember the “eggs in one basket” arguments? So, we started the massive move to SAN/NAS-based storage, which has arguably made many a company rich. In fact, this move made EMC buy VMware outright.

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