SAP HANA backup to B2D (COFC) catalyst fails randomly on SLES 12 SP2/SP3

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over 1 year ago

Symptoms

The SAP HANA backup to B2D (COFC) catalyst fails randomly with the following errors:

[Critical] From: OB2BAR_SAPBACK@<hostname> "<specname>"  Time: <timestamp> 
Unexpected close reading NET message => aborting.

[Major] From: BSM@<hostname> "<specname>"  Time: <timestamp> 
[61:3003]  Lost connection to OB2BAR Backup DA named "<specname>" 
on host <hostname>. 
Ipc subsystem reports: "IPC Read Error 
System error: [10053] Software caused connection abort 

Diagnosis

Since that advent of systemd v228 and beyond,  included in SLES12 SP2, SAP systems will likely need to adjust the DefaultTasksMax setting, which was introduced by Linux upstream as a security feature to prevent any one service from spawning to many threads and consuming all server resources.

the default value is 512 which is considered "low" for hana backup system with catalyst store.

Solution

The resolution is Increasing  the xinetd limit on SUSE Linux Enterprise Server 12 (SP2 and SP3) by setting the TasksMax=infinity in the /usr/lib/systemd/system/xinetd.service file.

Reload the service after the change by executing "systemctl daemon-reload"

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