On Wed, Mar 21, 2012 at 11:13 AM, John R Pierce pierce@hogranch.com wrote:
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
Hi John
The ESX host is attache to an Infortrend iSCSI SAN with 2 RAID5 arrays , each array has 3 LUNs. The disk are 7200 SATA Seagate disks.The virtual machines run out off disks the reside on the LUNs..
I will have a look at the SAN and see if there are any errors.
Thanks