[Beowulf] SSDs for HPC?

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Wed Apr 9 12:49:51 PDT 2014

I was thinking ISAM... Isn't that what everyone uses now?  I mean OS/360 is 50 years old, so most of the bugs have been shaken out. I have been thinking about moving to that newfangled thing where you hash the key to determine which bucket the record will be in.

Jim Lux

-----Original Message-----
From: Beowulf [mailto:beowulf-bounces at beowulf.org] On Behalf Of Greg Lindahl
Sent: Tuesday, April 08, 2014 8:28 PM
To: beowulf at beowulf.org
Subject: Re: [Beowulf] SSDs for HPC?

On Tue, Apr 08, 2014 at 02:12:58PM +0000, Lux, Jim (337C) wrote:
> Consider something
> like a credit card processing system.  This is going to have a lot of 
> "add at the end" transaction data.  As opposed to, say, a library 
> catalog where books are checked out essentially at random, and you 
> update the "check out/check in" status, and writes are sprinkled 
> randomly through out the data.

The way most NoSQL databases work, the library catalog would also do sequential writes. All updates, no matter where, are sequential writes.

They're not your father's SQL database.

-- greg

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