[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-users] Can't use DVD Writer in DomU
> On Thursday 14 February 2008 08:41:05 pm James Harper wrote: > > The block interface provided by blkback and blkfront is pretty basic, > > supporting only read, write, and write+barrier. There is no provision > > for the sort of commands required for doing writing. > > What is 'write+barrier'? Thanx. The barrier is a signal to pass on to the disk that all writes sent to the disk before the barrier should be completed before any writes sent after the barrier. The disk (or disk array etc) may re-order writes for efficiency reasons, especially if write caching is happening. This can be disastrous if the operating system has made an assumption about the atomicity of its write operation. James _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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