NOTE: NVM Primitives are offered as published interfaces. Source code implementations of NVM Primitives are vendor-specific. See http://www.t10.org/cgi-bin/ac.pl?t=d&f=13-064r1.pdf for the Atomic Writes submission to the INCITS T10 SCSI Standards working group.

WELCOME TO NVM PRIMITIVES

1. OVERVIEW
2. GETTING STARTED WITH NVM PRIMITIVES
3. IOMEMORY AND VSL INSTALLATION
4. VSL CONFIGURATION
5. NVM PRIMITIVES INSTALLATION
6. NVM PRIMITIVES API REFERENCE
7. NVM PRIMITIVES SAMPLE CODE

1. OVERVIEW

The NVM Primitives library, as described in the API specification, is a lightweight user space library that provides basic operations such as simple atomic writes, vectored atomic writes, and mixed vectors of atomic writes and trims. The library leverages highly-optimized primitives such as sparse addressing, atomic-writes, Persistent TRIM, etc., provided by the underlying Flash Translation Layer (FTL). The strong consistency guarantees of these Primitives allow calls within this library to achieve high performance combined with ACID compliance. The majority of the APIs in this library offer simple, powerful interfaces to prevent torn/incomplete writes without complex journaling or double-buffering approaches. Additional APIs include the ability to query device capabilities, physical capacity, and capacity used, as well as a few other miscellaneous interfaces.

2. GETTING STARTED WITH NVM PRIMITIVES

See the 'DIY On-Premises -> User-space NVM Primitives' section under http://opennvm.github.io/get-started.html

3. IOMEMORY AND VSL INSTALLATION*

* For ioMemory and VSL installation and configuration assistance, please contact Fusion-io support at https://support.fusionio.com

• NOTE: With the release of VSL 3.3.3, NVM Primitives are only supported on Fusion-branded ioMemory devices. Future VSL releases will provide support for NVM Primitives on OEM-branded ioMemory devices.

• Request download access to VSL 3.3.3, Limited Availability release and NVM Primitives library by sending email to [email protected]

• Download VSL 3.3.3 and the NVM Primitives from https://support.fusionio.com.

• Install a supported Linux OS and kernel (CentOS 6, RHEL 6, SLES11SP2, or Ubuntu 12.04 with a 2.6.32 kernel).

• Install Fusion ioDrive2 or ioScale device according to the ioMemory Hardware Installation Guide for VSL 3.3.x, downloaded with VSL 3.3.3.

• Install VSL 3.3.3, according to the Software Installation section of the accompanying ioMemory VSL 3.3.3 User Guide for Linux.

• Ensure the ioMemory firmware is up-to-date by following instructions in the Upgrading the Firmware section of the ioMemory VSL 3.3.3, User Guide for Linux

4. VSL CONFIGURATION

1. Login as root

2. Disable auto_attach by issuing the following command:

     #insmod iomemory-vsl auto_attach=0
   

3. Detach the device if it is already attached:

     #fio-detach /dev/fctx
     
     (where fctx is fct1 or fct2, etc.)
   

4. Format the device with ioMemory SDK options enabled (-A for atomic writes, -P for persistent TRIM, and -e for sparse address).

     #fio-format -fyAP -e /dev/fctx
   

5. Attach the device for I/O operations.

     #fio-attach /dev/fctx
   

   This should result in device (fiox) appearing under /dev.

5. NVM PRIMITIVES INSTALLATION

1. Install the ioMemory SDK packages from https://support.fusionio.com (Under Downloads, select ioMemory SDK under Pick Product Options. Look for libnvm-dev-<kernel version>.<version>-1.0.el6.x86_64.rpm under SDK section).

2. Install packages with the rpm utility:

     rpm -ivh libnvm-dev-<kernel version>.<version>-1.0.el6.x86_64.rpm
   

   Note: If libnvm-dev from a previous early-access release is already installed, please uninstall it before installing the packages for 1.0.0

     rpm -e <ioMemory SDK package name>
   

3. Verify that the libnvm-dev package has been installed.

     rpm -qa | grep libnvm
     libnvm-dev-<kernel version>.<version>-1.0.el6.x86_64
   

4. Verify that the following artifacts are installed:

   Header files:

     nvm_primitives.h, nvm_error.h and nvm_types.h should be available at /usr/include/nvm/ and knvm_primitives.h,
     nvm_types.h should be available at /usr/src/nvm/include/.
   

   Shared libraries:

     libnvm-primitives.so should be available at /usr/lib/nvm
   

   Kernel primitives kernel module:

     libknvm.ko should be available at /lib/modules/<kernel version>/kernel/lib/
   

   Sample Code:

     sample code should be available at /usr/share/doc/nvm/primitives/.
   

5. Note that the ioMemory SDK requires special formatting of the ioMemory device. Attaching an ioMemory device can fail if the device is not properly formatted. See the VSL Configuration section above.

6. NVM PRIMITIVES API REFERENCE

http://opennvm.github.io/nvm-primitives-documents/

7. NVM PRIMITIVES SAMPLE CODE

https://github.com/opennvm/nvm-primitives/tree/master/docs/examples/user