Gregory Machin
2012-Mar-20 21:54 UTC
[CentOS] errors in logs - kernel: XFS (dm-7): xlog_space_left: head behind tail
Hi. I have a CentOS 6.2 virtual machine in a vmware ESXi 4.0 host 4G Ram 4 virtaul cpus and with about 4 TB of disk space formatted with XFS . I'm seeing a lot of : Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-4): xlog_space_left: head behind tail Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 129, tail_bytes = 20163072 Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 129, GH bytes = 20162880 Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-7): xlog_space_left: head behind tail Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 5, tail_bytes = 333417984 Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 5, GH bytes = 333417792 Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-7): xlog_space_left: head behind tail Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 5, tail_bytes = 333417984 Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 5, GH bytes = 333417792 What would casue this ? A quick google , I found a post that indicated I should unmount and mount the file systems. I have live production data on this machine so I need to be careful. What is the best solution ? Thanks Greg
John R Pierce
2012-Mar-20 22:13 UTC
[CentOS] errors in logs - kernel: XFS (dm-7): xlog_space_left: head behind tail
On 03/20/12 2:54 PM, Gregory Machin wrote:> I have a CentOS 6.2 virtual machine in a vmware ESXi 4.0 host 4G Ram 4 > virtaul cpus and with about 4 TB of disk space formatted with XFS . > I'm seeing a lot of : > > Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-4): xlog_space_left: head behind tail > Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 129, tail_bytes = 20163072 > Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 129, GH bytes = 20162880 > Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-7): xlog_space_left: head behind tail > Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 5, tail_bytes = 333417984 > Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 5, GH bytes = 333417792 > Mar 21 10:49:42 nzhmlfpr05 kernel: XFS (dm-7): xlog_space_left: head behind tail > Mar 21 10:49:42 nzhmlfpr05 kernel: tail_cycle = 5, tail_bytes = 333417984 > Mar 21 10:49:42 nzhmlfpr05 kernel: GH cycle = 5, GH bytes = 333417792 > > What would casue this ? A quick google , I found a post that indicated > I should unmount and mount the file systems. I have live production > data on this machine so I need to be careful. What is the best > solution ?what sort of physical disk storage is this vm using? I'm wondering if perhaps this storage is unreliable with regards to write commits, or write ordering. -- john r pierce N 37, W 122 santa cruz ca mid-left coast