linux-kernel - Re: ChunkFS - measuring cross-chunk references

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Message-Id: <1177320876.23226.7.camel@garfield>
Date:	Mon, 23 Apr 2007 15:04:36 +0530
From:	Kalpak Shah <kalpak@...syssoft.com>
To:	Karuna sagar K <karunasagark@...il.com>
Cc:	Amit Gud <gud@....edu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: ChunkFS - measuring cross-chunk references

On Mon, 2007-04-23 at 12:49 +0530, Karuna sagar K wrote:
> Hi,
> 
> The tool estimates the cross-chunk references from an extt2/3 file
> system. It considers a block group as one chunk and calcuates how many
> block groups does a file span across. So, the block group size gives
> the estimate of chunk size.
> 
> The file systems were aged for about 3-4 months on a developers laptop.
> 

With a blocksize of 4KB, a block group would be 128 MB. In the original
Chunkfs paper, Valh had mentioned 1GB chunks and I believe it will be
possible to use 2GB, 4GB or 8GB chunks in the future. As the chunk size
increases the number of cross-chunk references will reduce and hence it
might be a good idea to present these statistics considering different
chunk sizes starting from 512MB upto 2GB.

Thanks,
Kalpak.

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