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Re: Sparse files in Cygwin

From: Eric Blake <eblake at redhat dot com>
To: cygwin at cygwin dot com
Date: Wed, 26 Jul 2017 12:06:29 -0500
Subject: Re: Sparse files in Cygwin
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On 07/26/2017 12:02 PM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> Hello,
> 
> I have a question whether sparse files are supported in Cygwin.  From the source code,
> it looks like they are, but from the series of the following commands, I can't confirm:

They are, but only if you specifically update your mount options to ask
for them:

https://cygwin.com/cygwin-ug-net/using.html#mount-table

  sparse    - Switch on support for sparse files.  This option only makes
              sense on NTFS and then only if you really need sparse files.
	      Cygwin does not try to create sparse files by default for
	      performance reasons.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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References:
- Sparse files in Cygwin
  - From: Lavrentiev, Anton (NIH/NLM/NCBI) [C]

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