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Re: XFS Preallocation

To: Peter Vajgel <pv@xxxxxx>
Subject: Re: XFS Preallocation
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Tue, 01 Feb 2011 14:12:12 -0600
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Jef Fox <jef.fox@xxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <3F5ACD12257C714E9C0535D0A839171802AB01@xxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <155CAEA5D902E7429569DD197567724A01534D42@xxxxxxxxxxxxxxxxxxx> <20110128045205.GR21311@dastard> <155CAEA5D902E7429569DD197567724A01534D60@xxxxxxxxxxxxxxxxxxx> <20110129001700.GZ21311@dastard> <3F5ACD12257C714E9C0535D0A839171802A9B4@xxxxxxxxxxxxxxxxxxxxxxxxxx> <20110201080354.GM11040@dastard> <3F5ACD12257C714E9C0535D0A839171802AB01@xxxxxxxxxxxxxxxxxxxxxxxxxx>
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Peter Vajgel put forth on 2/1/2011 1:20 PM:

> At the scale we operate it does. We have multiple variables so the number of 
> combinations is large. We have hit every single possible hardware and 
> software problem and problem resolution can take months if it takes days to 
> reproduce the problem. Hardware vendors (disk, controller, motherboard 
> manufacturers) are much more responsive when you can reproduce a problem on 
> the fly in seconds (especially in comparative benchmarking). The tests 
> usually run only couple of minutes. With 12x3TB (possibly multiplied by a 
> factor of X with our new platform) it would be unacceptable to wait for 
> writes to finish.

Hi Peter,

When you mention scale, you're referring to the storage back end at
facebook.com, your employer, correct?


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