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Re: XFS memory recomendation?

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS memory recomendation?
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Fri, 17 Feb 2012 19:58:44 -0600
Cc: "Assarsson, Emil" <Emil.Assarsson@xxxxxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <20120217024941.GH14132@dastard>
References: <2BF070A7A2375D46BA1B6087F8D5DCB68BEA721CA3@xxxxxxxxxxxxxxxxxxxxxxx> <20120217024941.GH14132@dastard>
Reply-to: stan@xxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:10.0.1) Gecko/20120208 Thunderbird/10.0.1
On 2/16/2012 8:49 PM, Dave Chinner wrote:
> On Thu, Feb 16, 2012 at 12:50:57PM +0100, Assarsson, Emil wrote:
>> Hi,
>> Are there any recommendations about how much memory I need based
>> on the size of the file system and/or amount of files?  For
>> example: how much memory would be optimal for a 20TB file system
>> with 3000000 files? 
> /me shrugs
>> I guess it depends on the usage pattern?
> Totally.

Allow me to drag the OP's question under a different light...

I have a 20TB XFS filesystem with 3000000 files.  What is the minimum
amount of system RAM I will need to run an xfs_check or xfs_repair or
xfs_[tool] on this filesystem, assuming Linux has been put into a low
overhead state, and said tool[s] has access to the bulk of the system

Is there a formula available so any XFS user can calculate this
xfs_[tools] RAM requirement, given FS size X and file count Y?


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