Slow Performance for NFS Repository Mounted with Options: "noac" and "forcedirectio"
(Doc ID 2734341.1)
Last updated on MAY 26, 2021
Applies to:Oracle VM - Version 3.4.5 and later
Solaris (SPARC) - Version 10 and later
OVM Sparc servers is experiencing performance issues on EMC VNX NFS storage.
Running a simple dd command on the mounted repository shows the performance degradation:
root@<Hostname>:/mnt# time dd if=/dev/zero of=/OVS/Repositories/<Repository ID>/1GB bs=1024000 count=1024 1024+0 records in 1024+0 records out
real 0m39.304s user 0m0.004s sys 0m2.091s
The degradation of performance is also seen only after a Reboot.
If the repository is unpresented and presented back to the server OR if a repository is presented on the fly the performance is better.
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