From: Matthias Neuer <mneuer@web.de>
To: Eric Sandeen <sandeen@sandeen.net>
Cc: xfs@oss.sgi.com
Subject: Re: xfs spanning over ssd and hdd
Date: Tue, 13 May 2014 09:07:40 +0200 [thread overview]
Message-ID: <5371C4BC.2010902@web.de> (raw)
In-Reply-To: <5370D8AA.2010003@sandeen.net>
Hi.
On 05/12/2014 04:20 PM, Eric Sandeen wrote:
> 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.
>
Ok, thanks for the info. I fear that xfs is too intelligent because
filling the device from front to rear seems to be a simple policy.
Maybe I should try FAT16 :)
Thanks
Matthias
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prev parent reply other threads:[~2014-05-13 7:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-12 12:58 xfs spanning over ssd and hdd Matthias Neuer
2014-05-12 14:13 ` Emmanuel Florac
2014-05-13 7:00 ` Matthias Neuer
2014-05-12 14:20 ` Eric Sandeen
2014-05-13 7:07 ` Matthias Neuer [this message]
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