linux-kernel - Re: Cannot write file larger than 2TB on x86

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Message-ID: <Pine.LNX.4.64.0707250919270.16609@p34.internal.lan>
Date:	Wed, 25 Jul 2007 09:19:30 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Cannot write file larger than 2TB on x86_64?

Filesystem File Size Limit Filesystem Size Limit ext2/ext3 with 1 KiB 
blocksize 16448 MiB (~ 16 GiB) 2048 GiB (= 2 TiB) ext2/3 with 2 KiB 
blocksize 256 GiB 8192 GiB (= 8 TiB) ext2/3 with 4 KiB blocksize 2048 GiB 
(= 2 TiB) 8192 GiB (= 8 TiB)

http://www.suse.de/~aj/linux_lfs.html

That's the problem, nevermind!


On Wed, 25 Jul 2007, Justin Piszcz wrote:

> Erm, unless this is an EXT3 limitation--oops..
>
> On Wed, 25 Jul 2007, Justin Piszcz wrote:
>
>> The kernel is 2.6.9-42.ELsmp on RHEL4 x86_64.
>> 
>> servername$ dd if=/dev/zero of=4.8tb_file bs=1M count=4800000
>> File size limit exceeded
>> servername$ (stopped at 2TB)
>> 
>> The 64bit should not need the option obviously, because it is 64bit, is 
>> this a b
>> ug in the kernel?
>> 
>> For 32bit:
>> .config - Linux Kernel v2.6.22 Configuration
>> ..............................................................................
>>  ..................... Support for Large Single Files 
>> ......................
>>  . CONFIG_LSF: 
>> .
>>  . 
>> .
>>  . Say Y here if you want to be able to handle very large files (bigger 
>> .
>>  . than 2TB), otherwise say N. 
>> .
>>  . 
>> .
>>  . If unsure, say Y. 
>> .
>>  .
>> 
>> For 64bit:
>> .config - Linux Kernel v2.6.22 Configuration
>> ..............................................................................
>>  ............................... Block layer 
>> ...............................
>>  .  Arrow keys navigate the menu.  <Enter> selects submenus --->. 
>> .
>>  .  Highlighted letters are hotkeys.  Pressing <Y> includes, <N> excludes, 
>> .
>>  .  <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help, </> 
>> .
>>  .  for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < > 
>> .
>>  . ....................................................................... 
>> .
>>  . .    --- Enable the block layer                                       . 
>> .
>>  . .    [ ]   Support for tracing block io actions                       . 
>> .
>>  . .          IO Schedulers  --->                                        . 
>> .
>>  . .
>>                                .
>> 
>> 
>
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