| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
RE: [Xen-devel] IO caching on xen?
> marian klein, le Tue 15 Jul 2008 11:22:05 +0000, a écrit :
> > I am worried that the xen (or any other VM) with zvol
> device from ZFS
> > (or any other file system.) may remove the benefits of ZFS,
> > because the guest OS can write something to disk but the xen itself
> > can do some buffering
> > or lazy writing and it may delay to write to ZFS backend.
>
> Xen doesn't do any kind of buffering or lazy writing. It provides
> barriers to the guest, to ensure any needed coherency.
>
> Samuel
I'm not sure if this is related or not...
I was party to some internal irc where it was believed
to be the case that when a file-backed vbd using file:'...'
is used, dom0's page cache may contain buffer pages that
may be inconsistent with the disk, whereas a file-backed
vbd using tap:aio:'...' does not suffer from the same problem.
Can someone confirm or deny (and if denied, was this fixed
recently)?
Thanks,
Dan
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home