>>But what about Windows? Does NTFS support barriers too? Windows > 2003 support FUA (like in newer linux kernel). So it's safe.
virtio-win driver support it too since 1 or 2 year. I have had a discuss about it some year ago, see : https://github.com/YanVugenfirer/kvm-guest-drivers-windows/issues/3 ----- Mail original ----- De: "Yufang" <yufang521...@gmail.com> À: "Alexandre DERUMIER" <aderum...@odiso.com> Cc: ceph-users@lists.ceph.com Envoyé: Vendredi 22 Août 2014 18:05:32 Objet: Re: [ceph-users] Is it safe to enable rbd cache with qemu? Thanks, Alexandre. But what about Windows? Does NTFS support barriers too? Should I have confident that win2k3 guest could survive from data loss on host/guest crash? 发自我的 iPad > 在 2014年8月22日，23:07，Alexandre DERUMIER <aderum...@odiso.com> 写道： > > Hi, > for RHEL5, I'm not sure > > be barriers supported is maybe not implemented in virtio devices,lvm,dm raid > and some filesystem, > depend of the kernel version. > > Not sure what is backported in rhel5 kernel > > > see > http://monolight.cc/2011/06/barriers-caches-filesystems/ > > > > ----- Mail original ----- > > De: "Yufang Zhang" <yufang521...@gmail.com> > À: ceph-users@lists.ceph.com > Envoyé: Vendredi 22 Août 2014 13:05:02 > Objet: [ceph-users] Is it safe to enable rbd cache with qemu? > > > Hi guys, > > > Apologize if this question has been asked before. I'd like to know if it is > safe to enable rbd cache with qemu (cache mode set as writeback) in > production? Currently, there are 4 types of guest os supported in our > production: REHL5, RHEL6, Win2k3, Win2k8. Our host is RHEL6.2 on which qemu > supports ' barrier-passing'. Thus we have confident that RHEL6 guests(with > barrier enabled by default ) could work well with rbd cache enabled. But as > for REHL5, Win2k3 and Win2k8, I am not sure if it is 100% safe on scenarios > such as guest crash, host crash or power loss. Could anybody give some > suggestion? Really appreciate your help. > > > Yufang > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
