Hi, With latest QEMU and latest gluster git, I observe guest root filesystem corruption when the VM boots. QEMU command line I am using is this: qemu-system-x86_64 --enable-kvm --nographic -m 1024 -smp 4 -drive file=/mnt/F17,if=virtio -net nic,model=virtio -net user -redir tcp:2000::22 Gluster volume is mounted in this manner: glusterfs -s bharata --volfile-id=test -L DEBUG -l glusterfs.log /mnt I see IO errors like this when VM boots: [ 1.698583] end_request: I/O error, dev vda, sector 9680896 [ 1.699328] Buffer I/O error on device vda3, logical block 1081344 [ 1.699328] lost page write due to I/O error on vda3 [ 1.706644] end_request: I/O error, dev vda, sector 1030144 [ 1.707630] Buffer I/O error on device vda3, logical block 0 [ 1.707630] lost page write due to I/O error on vda3 [ 1.718671] dracut: /dev/disk/by-uuid/d29b972f-3568-4db6-bf96-d2702ec83ab6: clean, 21999/623392 files, 796916/2492672 blocks [ 1.723455] dracut: Remounting /dev/disk/by-uuid/d29b972f-3568-4db6-bf96-d2702ec83ab6 with -o ro VM eventually comes up with RO rootfs. Shutdown path sees these kinds of error: [ 16.034271] EXT4-fs (vda3): previous I/O error to superblock detected [ 16.041699] end_request: I/O error, dev vda, sector 1030144 [ 16.042679] EXT4-fs error (device vda3): ext4_remount:4418: Abort forced by user [ 16.046465] EXT4-fs (vda3): re-mounted. Opts: (null) Full glusterfs log is too big to go with this mail. I can see this kind of errors: [2012-08-07 05:56:29.598636] T [io-cache.c:128:ioc_inode_flush] 0-test-io-cache: locked inode(0xd2d2c0) [2012-08-07 05:56:29.598642] T [io-cache.c:132:ioc_inode_flush] 0-test-io-cache: unlocked inode(0xd2d2c0) [2012-08-07 05:56:29.598651] T [fuse-bridge.c:2113:fuse_writev_cbk] 0-glusterfs-fuse: 319: WRITE => 4096/4096,4956618752/10737418240 [2012-08-07 05:56:29.598749] T [fuse-bridge.c:2293:fuse_fsync_resume] 0-glusterfs-fuse: 320: FSYNC 0xd6f060 [2012-08-07 05:56:29.598845] W [write-behind.c:2809:wb_fsync] 0-test-write-behind: write behind wb_inode pointer is not stored in context of inode(0x7f9cb1eab0c0), returning EBADFD [2012-08-07 05:56:29.598858] W [fuse-bridge.c:1063:fuse_err_cbk] 0-glusterfs-fuse: 320: FSYNC() ERR => -1 (File descriptor in bad state) [2012-08-07 05:56:29.605831] T [fuse-bridge.c:2154:fuse_write_resume] 0-glusterfs-fuse: 322: WRITE (0xd6f060, size=4096, offset=527433728) Just to clarify, I am not using GlusterFS block backend in QEMU (via libgfapi) here but instead using it with normal FUSE mount. Regards, Bharata. -- http://bharata.sulekha.com/blog/posts.htm, http://raobharata.wordpress.com/
