Hello, I'm testing virtualization of some Oracle servers. I have 4.1.1 with CentOS 7.3 servers as hypervisors. Typically on physical Oracle servers I configure huge pages for Oracle memory areas. In particular I disable Transparent Huge Pages, because they are known to be in conflict with Oracle performances, both in RAC and in standalone configurations. In RHEL systems I configure "transparent_hugepage=never" boot parameter, while in Oracle Linux OS uek kernels it is already disabled by default. I notice that in CentOS 7.3, by default, transparent huge pages are configured:
[root@ov300 ~]# cat /proc/meminfo | grep -i huge AnonHugePages: 17006592 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB [root@ov300 ~]# I'm going to configure a VM with 64Gb of ram and with an Oracle RDBMS that would have 16Gb of SGA. I suspect that I could have problems if I dont' change configuration at hypervisor level... What do you think about this subject? Is there any drawback if I manually configure the hypervisors to boot with the "transparent_hugepage=never" boot parameter? Thanks in advance, Gianluca
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