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Re: [Qemu-devel] [RFC][PATCH] make sure disk writes actually hit disk


From: Jonas Maebe
Subject: Re: [Qemu-devel] [RFC][PATCH] make sure disk writes actually hit disk
Date: Mon, 31 Jul 2006 09:56:08 +0200


On 31 jul 2006, at 09:08, Jens Axboe wrote:

Applications running on the host can count on fsync doing the
right thing, meaning that if they call fsync, the data *will*
have made it to disk.  Applications running inside a guest have
no guarantees that their data is actually going to make it
anywhere when fsync returns...

Then the guest OS is broken.

The problem is that supposedly many OS'es are broken in this way. See
http://lists.apple.com/archives/darwin-dev/2005/Feb/msg00072.html


Jonas




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