Cannot write file larger than 2TB on x86_64?

Cannot write file larger than 2TB on x86_64?

[Justin Piszcz]

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  --->                                        . .
   . .
                                 .

Re: Cannot write file larger than 2TB on x86_64?

[Justin Piszcz]

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  --->                                        . .
>  . .
>                                .
>
>

Re: Cannot write file larger than 2TB on x86_64?

[Justin Piszcz]

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  --->                                        . 
>> .
>>  . .
>>                                .
>> 
>> 
>