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Re: Win32 Powerfail testing

From: "Dave Page" <dpage(at)vale-housing(dot)co(dot)uk>
To: "Tatsuo Ishii" <t-ishii(at)sra(dot)co(dot)jp>
Cc: <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Win32 Powerfail testing
Date: 2003-03-06 13:33:45
Message-ID: 03AF4E498C591348A42FC93DEA9661B8259D1A@mail.vale-housing.co.uk (view raw or flat)
Thread:
Lists: pgsql-hackers

> -----Original Message-----
> From: Tatsuo Ishii [mailto:t-ishii(at)sra(dot)co(dot)jp] 
> Sent: 05 March 2003 13:49
> To: Dave Page
> Cc: pgsql-hackers(at)postgresql(dot)org
> Subject: Re: [HACKERS] Win32 Powerfail testing
> 
> 
> > > So far we found interesting facts. Our Win32 port passes his
> > > test in most cases. However if power of the machine is turned 
> > > off right after (10 to 20 seconds) the Checkpoint has been 
> > > made, it does not passes his test. So we are thinking that 
> > > there is someting wrong with the checkpoint implementaion for 
> > > Win32 port, which is essentially same as Jan's 
> > > implementation. i.e. using _flushall() instead of sync().  We 
> > > were looking for a fix or an alternative implementaion of 
> > > sync() without success.
> > 
> > Hi Tatsuo,
> > 
> > Does this help: 
> > http://support.microsoft.com/default.aspx?scid=kb;en-us;66052
> 
> Sorry, but it does not help. The page says we could use
> FlushFileBuffers() to sync the kernel buffer to the
> disk. Unfortunately, it requires a file descriptor to flush 
> for its argument. Thus it could not be a replacement of 
> sync(). Actually I have modified the buffer manager so that 
> it remembers all file descriptors those have not been synced 
> yet to the disk at the checkpoint time to sync them later. 
> However I found this modification does not help at all with 
> some reason I don't know.

How do you open the files (function, flags etc)? 

Regards, Dave.

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