Intel Rapid Storage Technology

Intel Rapid Storage Technology (RST), until 2010 called Matrix RAID, is a "soft" RAID solution built into a wide range of Intel chipsets. As of 2020, it includes a RAID system capable of RAID levels 0, 1, 5, and 10, a block level SSD caching accelerator ("Smart Response Technology") with support for write-back and write-through modes for speed or data protection of any disk or RAID array, and support for intelligent caching, speedy recovery from certain issues, and for PCI Express based drives. Intel RST comes in two variants, RST for desktops, and RSTe (now rebranded as VROC [1]) for enterprise scenarios, although for many chipsets, the user can choose as both variants will operate correctly.[2]

Diagram of an Intel RST setup

Intel RST is provided by a combination of firmware, chipset and CPU capabilities, and software. As such, the chipset, the firmware included in the BIOS, and the software installed by the user, must be compatible versions. Online forums and communities exist which compare the benefits of different versions of these, advise as to best compatibility for specified hardware, and modify existing firmware and software to allow optimal combinations or updates beyond those provided by the hardware manufacturers.[3]

Like all RAID (Redundant Array of Independent Disks), Intel RST RAID employs two or more physical hard disks which the operating system will treat as a single disk, in order to increase redundancy which avoids data loss (except RAID 0), and/or to increase the speed at which data is written to and/or read from a disk. Intel RST RAID does not provide new RAID levels. It allows different areas (e.g. partitions or logical volumes) on the same disk to be assigned to different RAID devices, unlike some other RAID controllers. Intel recommends to put any critical applications and data on a RAID 1, 5, or 10 volume, with redundancy to protect against data loss. The RAID 0 volume in Matrix RAID provides fast access to large files where data loss is not a critical issue but speed is; examples include video editing, swap files, and files that are backed up. Intel Matrix RAID, Intel Rapid RAID, and Intel Smart Response Technology are together described as Intel Rapid Storage Technology.[4]

Operating system support

"Rapid Storage Technology" (RST), including creation of RAID volumes, works under Windows 7 and newer versions of Microsoft Windows. The older "Intel Matrix RAID" is supported under Microsoft Windows XP.

Linux supports Matrix RAID through device mapper (DM-RAID) for RAID 0, 1 and 10, and Linux MD RAID for RAID 0, 1, 10, and 5. Set up of the RAID volumes must be done by using the ROM option in the Matrix Storage Manager, then further configuration can be done in DM-RAID or MD-RAID.[5]

FreeBSD and MidnightBSD support Intel Matrix RAID using the "ataraid" driver, managed through the atacontrol command.[6][7] However, with older versions of FreeBSD there were critical reliability issues which include array device renaming when a disk in an array is replaced,[8] an array being considered healthy if the machine reboot/crashes during an array rebuild,[9] and kernel panics when a disk is lost or is removed from the bus.[10][11] Some of these problems, when experienced in combination, could result in the loss of an entire array (even in the case of RAID 1).

VMware ESXi 4 does not support any RAID function nor Intel Matrix RAID based on Intel ICHxR controllers.[12]

PGPDisk does not support Intel Matrix RAID based on Intel ICHxR, and does not support standalone drives if the "RAID" mode is enabled on the motherboard.

Matrix Storage Manager option ROM

The Intel Matrix Storage Manager (IMSM) option ROM is a part of Matrix RAID that has to be used in the BIOS to create new RAID arrays.[13] As of 2014 Intel uses "Rapid Storage Technology" -"Option Rom"- on its new chipsets, dropping the "Matrix" name.[14][15] An Intel document notes that Matrix RAID storage changed to RST (Rapid Storage Technology) beginning with version 9.5.[16]

There are have been several driver versions:

VersionRelease dateNotes
v3.0.02003
v3.x.x
v5.5.02006Last version to support ICH5R
v5.x.x
v6.0.02006Included on P965 chipsets with ICH8R southbridge
v7.x.s2007
v8.0.02008Standard on Intel X58-based motherboards.
v8.x.x2008
v8.9.02009latest version with WIN XP support, data loss risk: no S.M.A.R.T.support for newer HDD/SSD
v9.5.0The product name was changed from "Intel(R) Matrix Storage Manager" to "Intel(R) Rapid Storage Technology"
v9.6.02010
v10.1.02011Last version to support ICH8R
v10.5.02011Standard on Intel Z68-based motherboards.

This version is the first to support RAID arrays made of HDDs with over 2.2 TB.[17]

v10.6.0June 2011
v10.8.0November 2011Last version to officially support ICH9R.(Supermicro X7SPA-L)
v11.0.0February 2012
v11.2.0June 2012[18] 11.2 which offers TRIM support on RAID 0 compatible with Windows 7 on Intel 7 series chipsets (earlier chipsets are officially orphaned by Intel).But you can mod RST or MSM oROM to support "TRIM on RAID 0" on ICH8R and up.
v11.6.0September 2012[19]
v11.7.0November 2012
v11.7.4.1001March 2013Last version to support ICH7R and ICH7M, ICH9M, ICH10R and ICH10D
v12.x.x.2013
v12.7.0.1910June 2013This option ROM version is the last version for the X79 chipset, Intel has updated to a 13 series, but no function on X79.
v12.7.0.1936July 2013This version is installed on some Intel C226 Chipset-based motherboards (e.g. Asus P9D WS).
v12.8.0.1016August 2013Windows Boot Problem when using Windows 8.1 & 10 use 13.1 and up, no solution for PCH 6 as of October 2015.
v12.9.0.1001December 2013
v12.9.4.1000July 2014Last version to support PCH 5 and PCH 6 series
v13.1.0.2030August 2013This version is designed for the new 8 series chipset. This can be injected into a X79 chipset with modification.
v13.1.0.1058May 2014
v13.x.x.x2014
v13.6.0.1002December 2014Last generic version to support PCH 7 series
v14.x.x.x2015Last version to support PCH 8 & 9 series
v15.x.x.xxxx2016
v15.9.0.1015November 2017Last version to support Windows 8.1 and earlier
v16.0.2.1086February 2018First generic version to support Skylake CPUs
v16.5.1.1030February 2018First generic version to support the 300 series chipsets
v16.8.3.1003July 2019
v17.5.2.1024August 2019Improved Optane support
v17.7.0.1006September 2019

Since release 11.2.0.0000, TRIM commands can be read by Windows RAID drivers made for 7 series chipsets. There is no RAID mode TRIM support on drivers for older chipsets.[20]

Intel states that RST support was added for the X79 chipset in RST version 11.6.0.0000 and after.[21]

On some 6 series chipsets there is a modification for the ROM in the BIOS, which will allow TRIM support on the 6 series chipset.[22]

For the X79 chipset, certain motherboard manufacturers have added both RAID ROMs in the BIOS, the RST and RST-E ROM. X79 is the Enterprise version, called RST-E. With the RST ROM added to the BIOS, this allows TRIM function to pass through the controller and TRIM SSD drives when RAID is enabled. This workaround was needed before RST-E driver version 3.8 was shipped which passed through TRIM commands to a RAID array without modifications to the RST-E ROM. There is no support for TRIM in the RST-E version of the ROM when RAID is enabled and the RST-E driver version is less than 3.8[23]. It is possible to add an RST ROM to the BIOS to enable TRIM passthrough in RAID mode by using the RST ROM and driver.[22]

The newest Option ROM version is a 13 series ROM, this ROM will not be used by motherboard manufacturers for the X79 chipset BIOS, and it can be injected into a BIOS to use on the X79 with modded code, for those MFG's who have added a ROM switch, this is where the MFG has added both RST and RSTe to the RAID option of a BIOS, but there needs to be a code added for TRIM commands to be sent, when you inject the RST and replace the RSTe with RST option ROM in X79 boards that do not contain the ROM switch, TRIM can be dysfunctional.

There are modded RST 13 series Option ROMs (legacy) available at certain BIOS modding sites that have been made functional for use in the X79 chipsets.

When booting in a BIOS environment (legacy) and some / EFI, the RST option ROM is used. When booting in a true UEFI environment the Option ROM is not used as a SataDriver with the RST version takes over. In BIOS mode the legacy/BIOS booting is under CSMCORE. In true UEFI mode the RST is controlled under SataDriver in BIOS.

The Intel RAID ROM is the firmware in the motherboard BIOS that is used to create the RAID array.

Note: The RST drivers can be used for RAID and also on a single drive as it contains an AHCI driver. There is a bug in the version 12.5.0.1066 RST driver, which cause TRIM commands not to pass through the RAID driver to the drives. TRIM is disabled using this driver.

Rapid Storage Technology enterprise (Intel RSTe)

Intel Rapid Storage Technology enterprise (Intel RSTe)[24] provides performance and reliability for supported systems equipped with Serial ATA (SATA) devices, Serial Attached SCSI (SAS) devices, and/or solid state drives (SSDs) to enable an optimal enterprise storage solution. The main difference between RST and RSTe is that the RST is used for desktop systems and the RSTe is mostly used for server systems.[25] RST supports regular SATA controllers from desktop systems.

If the BIOS of the motherboard has RSTe feature then the user cannot install Intel Rapid Storage Technology software (error message: This platform is not supported). The user has to install RSTe software.

There are have been several Option ROM versions:

VersionRelease dateNotes
v4.3.0.10102014This version is installed on some Intel C236 Chipset-based motherboards (e.g. Asus P10S WS)

In 2010, Intel announced that the RTSe branding would be replaced, with RSTe consolidated into Intel's VROC (Virtual RAID on CPU) product line.[1]

Intel VROC (Virtual RAID on CPU)

Intel VROC is a successor to Intel RSTe. This was mostly designed with NVMe SSD's in mind and it is directly attached to the Intel Xeon Scalable processors. For the full functionality it uses a newer Intel technology called Intel VMD (Intel Volume Management Device).
Intel VMD is a technology from the Intel Xeon Scalable processors series and is used to provide hot-plug, surprise-removal, and LED management of NVMe SSD's for server usage. Intel VROC is targeted for Linux O/S, Microsoft Windows Server OS and Microsoft Windows 7 and 10. For client PC's (with Intel Core, Pentium and Celeron processors) Intel RST is still the advised software package to use.[26]

See also

References
  1. Intel® VROC vs. Previous Intel® RSTe: Name Change Explained - Intel article
  2. win-raid forum is a website that provides guidance as to whether specific chipsets perform better with RST or RTS(e), if a choice exists and both will work.
  3. https://www.win-raid.com
  4. "Getting Started", Intel Rapid Storage Technology 11.5.0.12.07 Help, Intel
  5. "Linux support for Intel RAID controller hubs". Intel website. Retrieved November 5, 2011.
  6. "ataraid -- ATA software RAID support". FreeBSD manual. February 17, 2006. Retrieved November 5, 2011.
  7. Soren Schmidt (February 21, 2009). "ATA device driver control program". FreeBSD manual. Retrieved November 5, 2011.
  8. "kern/121899: [ar] [patch] Drive detached from Intel Matrix RAID and returned comes up as entirely new ataraid". Freebsd.org. Retrieved 2014-04-02.
  9. "kern/102210: [ar] [patch] reboot system makes rebuilding array ready (ICH7)". Freebsd.org. Retrieved 2014-04-02.
  10. "kern/102211: [ar] [patch] detach raid member and reboot will cause panic (ICH7)". Freebsd.org. Retrieved 2014-04-02.
  11. "kern/108924: [ar] Panics when Intel MatrixRAID RAID1 is degraded". Freebsd.org. Retrieved 2014-04-02.
  12. "RAID-5 ON VMWARE ESXI | VMware Communities". Communities.vmware.com. Retrieved 2014-04-02.
  13. "Intel Matrix Storage Technology". Nmso.mdg.ca. Archived from the original on 2014-04-07. Retrieved 2014-04-02.
  14. Allyn Malventano (2011-05-11). "Intel Smart Response Technology: SSD Caching on Z68 Tested | Boot Option ROM / Boot Performance". Pcper.com. Archived from the original on 2012-04-04. Retrieved 2014-04-02.
  15. "Intel® Rapid Storage Technology (Intel® RST) — System requirements". Intel.com. Retrieved 2014-04-02.
  16. "Supported Intel Chipsets and Controller Hubs". Intel.com. 2016-02-05. Retrieved 2016-03-01. The product name was changed from Intel Matrix Storage Manager to Intel RST beginning with version 9.5
  17. "RAID array with 3TB disks". Communities.intel.com. Retrieved 2014-04-02.
  18. "The file that you are trying to". Downloadmirror.intel.com. Archived from the original on 2014-03-12. Retrieved 2014-04-02.
  19. "The file that you are trying to". Downloadmirror.intel.com. Archived from the original on 2014-04-07. Retrieved 2014-04-02.
  20. Doug Crowthers. "TRIM Command Confirmed With RAID 0 on Intel 7 Series". Tomshardware.com. Retrieved 2014-04-02.
  21. "The file that you are trying to". Downloadmirror.intel.com. Archived from the original on 2014-04-07. Retrieved 2014-04-02.
  22. "[veraltet] AHCI/RAID ROM modules for BIOS modding - already extracted". Win-lite.de. 2007-02-11. Archived from the original on 2013-08-30. Retrieved 2014-04-02.
  23. https://www.win-raid.com/t2f23-Intel-RST-RSTe-Drivers-newest-v-WHQL-v-WHQL.html
  24. "Intel Rapid Storage Technology enterprise (Intel RSTe)". Intel. Retrieved 2019-01-07.
  25. "Intel Rapid Storage Technology enterprise: Product Brief". Intel. Retrieved 2019-01-07.
  26. https://www.intel.com/content/dam/www/public/us/en/documents/technology-briefs/client-raid-and-dc-raid-solutions-technology-brief.pdf

This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.

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