Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, Jun 22, 2012 at 6:53 PM, Thilo Uttendorfer <t.uttendorfer at linux-ag.com> wrote: > Hi, > > we have a KVM cluster with each virtual machine running on top of a DRBD > device. After running this setup for many month we recently saw these log > messages on two (of total 15) DRBD devices: > > Jun 22 17:53:01 server-v1 kernel: [4995041.347749] block drbd13: > qemu-system-x86[9395] Concurrent local write detected! [DISCARD L] new: > 53981575s +28672; pending: 53981575s +20480 Those writes overlap only partially, so yes that's cause for concern. Not saying that you are actively shredding your data, but you at least need to double check. > Looking at older posts on this topic [1], we are worried that we have serious > data corruption. Does this indicate that qemu-system-x86 (kvm) has a bug in > some (probably rare) conditions? Libvirt configuration or qemu/kvm command line please? (don't post them here; pastebin and share the URL instead). Cheers, Florian -- Need help with High Availability? http://www.hastexo.com/now