The net-lbt service fails intermittently
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The net-lbt service fails intermittently

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Article ID: 317659

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction


  • The net-lbt daemon fails with an error such as ...Admission failure in path: lbt/net-lbt.7320960/uw.7320960
  • The vmkernel.log will show similar entries

 

[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 33/33, lbt (782) childEmin/eMinLimit: 3308/3328
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 43/43, lbt (782) childEmin/eMinLimit: 3308/3328
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu8:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 256/256, lbt (782) childEmin/eMinLimit: 3285/3328
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 43/43, lbt (782) childEmin/eMinLimit: 3327/3328
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 256/256, lbt (782) childEmin/eMinLimit: 3295/3328
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 43/43, lbt (782) childEmin/eMinLimit: 3295/3328
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 471: Admission failure in path: lbt/net-lbt.16145298/uw.16145298
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 478: UserWorld 'net-lbt' with cmdline '/sbin/net-lbt'
[YYYY-MM-DDTHH:MM:SS] cpu0:16145298)MemSchedAdmit: 489: uw.16145298 (104771134) extraMin/extraFromParent: 256/256, lbt (782) childEmin/eMinLimit: 3295/3328
 
  • Load-based teaming (LBT) policy does not work as expected
Note:The preceding log excerpts are only examples.Date,time and environmental variables may vary depending on your environment.


Environment

VMware vSphere ESXi

Cause

The issue occurs if the net-lbt daemon resource pool gets out of memory.

Resolution

This issue is resolved in VMware vSphere ESXi 6.7 Patch ESXi670-202008001.



Workaround:
To workaround is to increase the LBT allocated memory from 13MB to 16MB.

Please follow the below steps to make the changes persistent across the reboot.

1. Log into the ESXi host on SSH level as root.
2. Then cd /etc/rc.local.d
3. Take a backup of the existing file cp -p local.sh bk-local.sh
4. vi into the file with vi local.sh
5. Ensured the command line is entered as shown
/bin/vsish -e set /sched/groups/785/memAllocationInMB max=16
6. The above command should be entered just above exit 0 line in the file local.sh
7. Reboot the ESXi host.

Additional Information

Impact/Risks:
None.

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