Searching for Linux Direct I O Support information? Find all needed info by using official links provided below.
https://stackoverflow.com/questions/5055859/how-are-the-o-sync-and-o-direct-flags-in-open2-different-alike
The use and effects of the O_SYNC and O_DIRECT flags is very confusing and appears to vary somewhat among platforms. From the Linux man page (see an example here), O_DIRECT provides synchronous I/O, minimizes cache effects and requires you to handle block size alignment yourself.O_SYNC just guarantees synchronous I/O.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/chap-oracle_9i_and_10g_tuning_guide-enabling_asynchronous_io_and_direct_io_support
Enabling Asynchronous I/O and Direct I/O Support. Asynchronous I/O permits Oracle to continue processing after issuing I/Os requests which leads to higher I/O performance. Red Hat Enterprise Linux also allows Oracle to issue multiple simultaneous I/O requests with a single system call. This reduces context switch overhead and allows the kernel ...
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/global_file_system/s1-manage-direct-io
The Red Hat Customer Portal delivers the knowledge, expertise, and guidance available through your Red Hat subscription. 4.9. Direct I/O Red Hat Enterprise Linux 5 Red Hat Customer Portal
http://man7.org/linux/man-pages/man2/open.2.html
The NFS protocol does not support passing the flag to the server, so O_DIRECT I/O will bypass the page cache only on the client; the server may still cache the I/O. The client asks the server to make the I/O synchronous to preserve the synchronous seman‐ tics of O_DIRECT. Some servers will perform poorly under these cir‐ cumstances ...
https://docs.oracle.com/cd/B19306_01/server.102/b15658/appc_linux.htm
Oracle Net supports Sockets Direct protocol (SDP) over the InfiniBand network architecture on Red Hat Enterprise Linux AS 3 for Oracle Database 10 g release 1. For this release, SDP support is limited to synchronous I/O only. For information about support for using asynchronous I/O on SDP, refer to the following document:
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