On Mar 31, 2009 at 1355 +1100, Matthew Palmer appeared and said: > Hi, > > I've just come across a somewhat strange problem that was suggested I > report to the list. > > The problem manifested itself as DMA errors and the like popping up in the > guest, like I'd expect to see if a disk in a physical machine was dying, > like this: > > hda: dma_timer_expiry: dma status == 0x21 > [...] I've seen a similar effect on my KVM host server. There were I/O errors on one partition. When I tried to reformat the partition and restore its content from backups, mkfs was reporting I/O errors, always at the same block number. I added a second qcow2 file and moved the partition there. > The VM has previously been quite stable until this problem started part of > the way through today. Another guest on the same host machine is fine. The KVM host runs since January very stable. The system is a Debian Lenny with custom kernel 2.6.28.8 and kvm-84. The filesystem for images is ext4 and the guests use ext4 in part, too. I cannot provide the images since they are quite large (about 20 to 44 GB) and they contain sensitive data. I plan to move to 2.6.29.x or 2.6.30.x for reasons of the ext4 patches regarding delayed allocation and to upgrade kvm, but I can to tests with the current system if you wish. Best, René. -- )\._.,--....,'``. fL Let GNU/Linux work for you while you take a nap. /, _.. \ _\ (`._ ,. R. Pfeiffer <lynx at luchs.at> + http://web.luchs.at/ `._.-(,_..'--(,_..'`-.;.' - System administration + Consulting + Teaching - Got mail delivery problems? http://web.luchs.at/information/blockedmail.php
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