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xen-users
Re: [Xen-users] Re: 100% safe way to backup domU: (was Yet another backu
On 11 Jan 2007 at 18:00, Emiliano Gabrielli (aka AlberT) wrote:
> On Thursday 11 January 2007 12:00, Ulrich Windl wrote:
> > when returning from the syscall the OS may still be
> > writing buffers, but I'm not too sure about that.
>
> even if the OS has flushed his buffers the disk write cache may be still not
> empty ...
>
> cfr man 2 sync:
> According to the standard specification (e.g., SVID), sync() schedules
> the writes, but may return before the actual writing is done. However,
> since version 1.3.20 Linux does actually wait. (This still does not
> guarantee data integrity: modern disks have large caches.)
Disk hardware caches are no issue here until you pull the plug after a sync. We
are talking about a sync in DomU...
Ulrich
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