You have been subscribed to a public bug: I have a Ubuntu 12.04 virtual machine with a 400 GB volume attached to it. This volume uses XFS filesystem on top of LVM2 setup and the backup system we use takes hourly backups. Since we freeze and unfreeze the filesystem during backups, I started seeing the following in the logs a lot.
Oct 14 06:52:35 localhost kernel: [4269962.940638] XFS (dm-1): xlog_space_left: head behind tail Oct 14 06:52:35 localhost kernel: [4269962.940639] tail_cycle = 7, tail_bytes = 38953984 Oct 14 06:52:35 localhost kernel: [4269962.940640] GH cycle = 7, GH bytes = 38953976 Oct 14 06:52:35 localhost kernel: [4269962.940656] XFS (dm-1): xlog_space_left: head behind tail Oct 14 06:52:35 localhost kernel: [4269962.940657] tail_cycle = 7, tail_bytes = 38953984 Oct 14 06:52:35 localhost kernel: [4269962.940657] GH cycle = 7, GH bytes = 38953976 This started occurred a lot and the backups were working fine for a day and then they started failing because they failed to remove the LVM snapshot using `lvremove`. After a little bit of research I found this commit in the linux kernel: https://github.com/torvalds/linux/commit/3948659e30808fbaa7673bbe89de2ae9769e20a7 which seems to fix the exact same problem I'm having. This commit fixes this issue form kernel version 3.4 onwards. The most recent virtual kernel available for Ubuntu 12.04 LTS release is "3.2.0-49-virtual". So the possible solutions are to either backport the xfs fix to 3.2.x kernel or release virtual kernel releases for the latest version of the kernel. I'll be happy to provide more information regarding this issue. ** Affects: linux-meta (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: bot-comment -- Request for updated Ubuntu virtual kernel images https://bugs.launchpad.net/bugs/1241848 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-meta in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
