On Wed, Oct 12, 2016 at 7:57 AM, Wido den Hollander <wido@xxxxxxxx> wrote: > Hi, > > I filed a issue in the tracker, but I'm looking for some feedback to diagnose this a bit further: http://tracker.ceph.com/issues/17545 > > The situation is that with a Firefly or Hammer (haven't tested Jewel yet) a MSSQL server running on RBD will sometimes complain about corruption. > > Using SQLioSim we can reproduce the issue on a small Proxmox + Ceph cluster and after an hour or so it will yield: > > Expected FileId: 0x0 > Received FileId: 0x0 > Expected PageId: 0xCB19C > Received PageId: 0xCB19A (does not match expected) > Received CheckSum: 0x9F444071 > Calculated CheckSum: 0x89603EC9 (does not match expected) > Received Buffer Length: 0x2000 > > The issue only seems to happen with RBD caching enabled. When disabling the RBD cache or using cache=directsync we were not able to reproduce the issue. > > When using LVM/file based backends for Qemu the problem also didn't pop up. > > So this seems to be either a librbd issue or the RBD driver inside Qemu. > > Any hints on how to debug this further to find the root cause? If you've got control over the clients, try building with commit 9ec6e7f608608088d51e449c9d375844631dcdde backported to them (I believe it's also in the latest Hammer release, but maybe there hasn't been one cut since the backport?); tracked at http://tracker.ceph.com/issues/16002 but of course the web site is dead so you can't look at that right now. :( -Greg > > Wido > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
