Sorry for the reply to self, but the last thing I tried has provided some more info: On Sat, Apr 07, 2007 at 03:10:27AM +0000, Andy Smith wrote: > I'm now seeing the exact same problem as Ask did in: > > http://www.mail-archive.com/linux-raid@xxxxxxxxxxxxxxx/msg06762.html > > again using md raid10 under LVM, trying to export an LV to a xen > domain. This LV was initially created as 512M in size. I extended it to 1G and experienced the same thing. I then created a new LV of size 2G, copied the contents of the first LV to the second, and used that as the domain's root filesystem. I no longer get this problem. I then deleted the original LV and renamed the new LV to the name of the original and things still work. I am able to do: dd if=/dev/sda1 of=/dev/null in the Xen domain and not receive any errors so I have to conclude that all blocks of this second LV are readable. So is this an issue of the layout of the LVM extents on disk? Will I get this problem again? Should I be pursuing this on the LVM list, here, or maybe even with the Xen folks? Cheers, Andy
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