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Re: XFS memory recomendation?

To: stan@xxxxxxxxxxxxxxxxx
Subject: Re: XFS memory recomendation?
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Fri, 17 Feb 2012 18:17:46 -0800
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "Assarsson, Emil" <Emil.Assarsson@xxxxxxxxxxxxxxxx>
In-reply-to: <4F3F05D4.1020705@xxxxxxxxxxxxxxxxx>
References: <2BF070A7A2375D46BA1B6087F8D5DCB68BEA721CA3@xxxxxxxxxxxxxxxxxxxxxxx> <20120217024941.GH14132@dastard> <4F3F05D4.1020705@xxxxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.1) Gecko/20120208 Thunderbird/10.0.1
On 2/17/12 5:58 PM, Stan Hoeppner wrote:
> 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
> memory?
> 
> Is there a formula available so any XFS user can calculate this
> xfs_[tools] RAM requirement, given FS size X and file count Y?
> 

http://xfs.org/index.php/XFS_FAQ#Q:_Which_factors_influence_the_memory_usage_of_xfs_repair.3F

-Eric



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