Date: Wed, 14 Jun 2017 12:00:09 -0400
From: Bruce Momjian <bruce@momjian.us>
To: "Klaus P. Pieper" <kpi6288@gmail.com>
Cc: 'PG-General Mailing List' <pgsql-general@postgresql.org>
Subject: Re: pg_upgrade --link on Windows
Message-ID: <20170614160009.GA4751@momjian.us>
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 <0405d125-929b-ab4a-b7be-d49c09e7c056@aklaver.com>
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On Wed, Jun 14, 2017 at 09:59:04AM +0200, Klaus P. Pieper wrote:
> > -----Ursprüngliche Nachricht-----
> > 
> > I apologize for not being smarter on this thread.  When I helped with the
> > Windows port, I was told Windows didn't have hard links for use by
> tablespace
> > directories, so I got it into my head that Windows didn't have hard links.
> > Therefore, when I was writing the docs, I called them junction points.
> 
> It's actually not "Windows" providing hard links, it is the file system
> NTFS. FAT and its modern cousins don't provide hard links - but this will
> rarely be used for databases these days. 
> However, ReFS (introduced with server 2012 and providing some new features
> like automatic integrity checks, clustering etc.) does no longer provide
> hard links. 
> Are hard links used anywhere else but in pg_upgrade?

Nope, it is used only by transfer_relfile() calling linkFile().

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +


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