Investigating an out of resources error on a datastore
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Investigating an out of resources error on a datastore


Article ID: 344563


Updated On:


VMware VMware vCenter Server VMware vSphere ESXi


This article explains the limit to the number of files allowed on a datastore and the steps required to resolve the issue.

  • Virtual machine fails to power on.
  • You cannot create a virtual disk.
  • There are more than 30000 files on the datastore. You can determine this with the find /vmfs/volumes/<data name store> -type f | wc -l </data>command.
  • You see entries similar to these in the log file /var/log/vmkernel :

    vmkernel.16:Jul 2 07:57:44 srvesx89 vmkernel: 16:23:58:16.675 cpu2:25710)WARNING: World: vm 25715: 699: init fn swap failed with: No swap file!
    vmkernel.16:Jul 2 07:57:44 srvesx89 vmkernel: 16:23:58:16.741 cpu3:25712)WARNING: Swap: vm 25712: 1480: Failed to create swap file '/volumes/<volume UUID>/<swap file>.vswp': Out of resources


VMware ESX Server 3.0.x
VMware ESXi 4.0.x Installable
VMware ESXi 4.1.x Embedded
VMware VirtualCenter 2.0.x
VMware ESX 4.0.x
VMware vSphere ESXi 5.5
VMware ESXi 4.0.x Embedded
VMware VirtualCenter 2.5.x
VMware ESXi 3.5.x Embedded
VMware vCenter Server 4.1.x
VMware ESX Server 3.5.x
VMware ESXi 4.1.x Installable
VMware vCenter Server 4.0.x
VMware ESX 4.1.x
VMware ESXi 3.5.x Installable


This issue occure because a VMFS-3 datastore can only have a maximum of 30720 files.

To resolve this issue:
    • Run this command to identify how many file handles are in use on the datastore:

      vmkfstools –P -v 10 /vmfs/volumes/<data label store>

      The output looks similar to:

      VMFS-3.21 file system spanning 1 partitions.
      File system label (if any): LUN-0
      Mode: public
      Capacity 34091302912 (32512 file blocks * 1048576), 1151336448 (1098 blocks) avail
      Volume Creation Time: Tue Apr 3 16:09:50 2007
      Files (max/free): 30720/30631
      Ptr Blocks (max/free): 61440/61409
      Sub Blocks (max/free): 3968/3906
      UUID: 4612b48e-be24f710-2df7-0013725ddc92
      Partitions spanned (on "lvm"):

      The Files row describes the maximum number of files and the number of free file handles remaining.

    • Look for an excessive quantity of vmware*.log files. If there there is an over abundance of generational log files (vmware-###.log and up), delete them.

    Additional Information