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Full Discussion: Create file for space Reserve
Special Forums Hardware Filesystems, Disks and Memory Create file for space Reserve Post 302388954 by Scrutinizer on Friday 22nd of January 2010 03:22:43 AM
Old 01-22-2010
This is usually done by reigning in the size of a filesystem.
But you can create a sparse file:
Code:
dd if=/dev/zero of=sparsefile bs=1 count=1 seek=3G

This should take less than a second to create. But this is probably not what you want.
If you want to reserve space as contiguously as possible to be used later by a database, then you should not create a sparse file, but a dense file:
Code:
dd if=/dev/zero of=densefile bs=1M count=3072

This will take a lot longer to create, as it fills the entire file with zeroes.


Use caution with the dd command though. You should read the man page first to understand what it does and think twice before issuing a command as it is a very powerful command that can easily destroy things.
Not every dd understands G and M, but only k as a signifier. I that is the case then you should be able to use 1024k instead of 1M or 3145728k instead of 3G in the examples above.


If you create both files and you issue
Code:
ls -l *file

then you should see both files and they should have the same size.
Code:
du -k *file

will show the difference

S.

---------- Post updated at 09:22 ---------- Previous update was at 08:53 ----------

Since you are on Solaris. check out:
Code:
man mkfile

Last edited by Scrutinizer; 01-22-2010 at 04:29 AM..
 

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LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
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