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kernel: XFS (dm-7): xlog_space_left: head behind tail

To: xfs@xxxxxxxxxxx
Subject: kernel: XFS (dm-7): xlog_space_left: head behind tail
From: Gregory Machin <gdm@xxxxxxxxxxxxxx>
Date: Wed, 21 Mar 2012 17:00:02 +1300
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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

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