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Re: xfs spanning over ssd and hdd

To: Matthias Neuer <mneuer@xxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: xfs spanning over ssd and hdd
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon, 12 May 2014 09:20:26 -0500
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <5370C592.6080402@xxxxxx>
References: <5370C592.6080402@xxxxxx>
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On 5/12/14, 7:58 AM, Matthias Neuer wrote:
> Hi.
> 
> I have a slow and big hdd and a fast but small ssd and want to test the 
> following setup but don't know if it's possible.
> 
> Use LVM to concatenate the ssd and the hdd linearly. Create a xfs filesystem 
> on this device such that the sdd is filled first, i.e. data is written to the 
> ssd as long as there is free space, otherwise the data is written to the hdd.
> 
> I have applications which may benefit from this setup but I am not sure so I 
> need to do some benchmarks.

XFS doesn't fill from the front, so you can't configure things to fill the HDD 
first.

Files in new directories rotor around the allocation groups on the filesystem, 
so all regions of the fs are filled more or less evenly.

-Eric

> Thanks for your help
> Matthias
> 
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