linux-kernel - Re: NFS Filesystem Size Limit?

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Message-ID: <Pine.LNX.4.64.0612181508300.31233@p34.internal.lan>
Date:	Mon, 18 Dec 2006 15:08:35 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
cc:	linux-kernel@...r.kernel.org
Subject: Re: NFS Filesystem Size Limit?

Thanks for the info!

On Mon, 18 Dec 2006, Trond Myklebust wrote:

> On Mon, 2006-12-18 at 14:21 -0500, Justin Piszcz wrote:
> > I have a question I could not quickly find on Google/mailing lists--
> > 
> > Say I have some sort of global filesystem or NFS which is 200TB.
> > 
> > Is there a limit either:
> > 
> > A) In the Linux kernel
> > or
> > B) In the NFS spec
> > 
> > That would limit the client as to what it could see via NFS or global 
> > filesystem?
> 
> No.
> 
> > Or could both 2.4 and 2.6 kernels 'see' the 200TB global filesystem over 
> > NFS or global filesystem?
> 
> 'df' may or may not report the filesystem size correctly (depends on
> whether you have VFS support for 64-bit filesystems enabled, and whether
> or not you are using NFSv3 or above), but you should be able to store
> 200TB worth or data on it irrespective of that.
> 
> The one thing that may be limited is the size of individual files. The
> NFSv2 protocol limits file sizes to 2GB, whereas NFSv3 and v4 should
> allow you to read and write full 64-bit sized files.
> Note though, that on most 32-bit hardware, the Linux VM design limits
> you to 44-bit file sizes (due to the 32-bit page table + 4k page size).
> 
> Cheers
>   Trond
> 
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