NetBackup 2.5.x appliance leaks semaphores following VMware backups over SAN leading to memory exhaustion.

Problem

NetBackup 2.5.x appliance leaks semaphores following VMware backups over SAN leading to memory exhaustion.

Cause

NetBackup 2.5.x appliances do not support multipath fibre connections to a SAN.

Can use the following command to identify leaked semaphores and their associated process:

# for semid in `ipcs -s | awk '/^0x/ {if ($1=="0x00000000") print $2}'`; do ipcs -s -i $semid; done | egrep -v "se               maphore|uid|mode|nsems|otime|ctime|semnum" | awk '{if ($5 != "0" && $5 != "") print $5}' | uniq | xargs ps -p

Solution

Solution:
1. Disable multipath SAN connectivity to one path to the NetBackup 2.5.x appliance media server VM proxy host for the purpose of VMware backups across a SAN.
2. Refer to TECH208979, similar issue will be resolved by NetBackup 7.5.0.7 and NetBackup appliance version 2.5.4 with a emergency engineering binary available/attached for NetBackup 7.5.0.6 and NetBackup appliance version 2.5.3.

Note: NetBackup appliance version 3.0 *should* support multipath fibre configurations.


Applies To

2.5.x appliance configured as a media server and a VM proxy host for VMware backups. Issue occurs during VMware backups over SAN. The 2.5.x media server has multipath fibre connections configured.

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