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From: Dave Chinner <david@fromorbit.com>
To: Gregory Machin <gdm@linuxpro.co.za>
Cc: xfs@oss.sgi.com
Subject: Re: kernel: XFS (dm-7): xlog_space_left: head behind tail
Date: Wed, 21 Mar 2012 15:30:31 +1100	[thread overview]
Message-ID: <20120321043031.GW5091@dastard> (raw)
In-Reply-To: <CAJzjPKkUm-uWuGs2xPLF9yZ71uUV8QwPApjGAf6EKDoGqQYqBA@mail.gmail.com>

On Wed, Mar 21, 2012 at 05:00:02PM +1300, 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

can you send the complete set of output, including the first
occurrence of it?

What workload are you running? Are you freezing you filesystem
frequently?

> 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 ?

Best solution? I don't know enough about the problem yet to suggest
one.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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  reply	other threads:[~2012-03-21  4:30 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-21  4:00 kernel: XFS (dm-7): xlog_space_left: head behind tail Gregory Machin
2012-03-21  4:30 ` Dave Chinner [this message]
2012-03-21  5:20   ` Dave Chinner

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