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vSAN disk group creation may fail when using large cache tier drives (2146495)

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  • When creating the third or subsequent disk group on the ESXi host, this step fails. 
  • In the /var/log/vmkernel.log file, you see entries similar to:

    Could not allocate new queue requests "LSOMComponentOpen": Out of memory


The issue of disk group creation failure on a vSAN  ESXi host occurs under these conditions:
  • There are 3 or more disk groups per ESXi host.
  • There are large cache tier drives with a capacity of approximately 1TB or greater.


This issue is resolved in these releases:
To work around this issue, increase the heap memory size on the ESXi host with these steps:
  1. Connect to the affected ESXi host with an SSH session.
  2. Run this command:

    esxcfg-advcfg -s 1024 /LSOM/heapSize

    Note: This will change the default heap memory size from 256 to 1024

  3. Reboot the ESXi host.
  4. Attempt the Disk group creation again.

See Also

Update History

04/10/2017 - Added details of the 6.0 U3 and 6.5 GA fix.

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