BEA-280101 warning while using Weblogic 10.3.3 on SPARC 64bit sun jvm

When you tuning weblogic and Startup it. In logs report errors BEA-280101

<Warning> <Store> <BEA-280101> <The persistent file store "_WLS_AdminServer" is forced to use buffered I/O and so may have significantly degraded performance. Either the OS/hardware environment does not support the chosen write policy or the native wlfileio library is missing. See store open log messages for the requested and final write policies. See the documentation on store synchronous write policy configuration for advice.> 

Tried various things but the problem persisted.  I'm using WL 10.3.3 on Solaris SPARC/x86 with 32 and 64 bit jvm. In the end, got below response from Oracle support:

The above warning message is thrown when file system does not support "direct io" (UNIX O_DIRECT). The file store will automatically change the file io mode to "single-handle-buffered" (UNIX O_SYNC) and will still continue to use Direct-Write policy for its reads and writes. (the terms “Direct-Write” and “direct io” are not synonymous).
In the future (most likely next release) we will suppress this warning message as this message is not appropriate for this kind of event. There is no action to be taken from your side on this warning message.

So ignoring this for now.