Windows Enterprise Desktop

May 2 2014   12:15PM GMT

From Now On, ALL My Win8.* Installs are RAID

Ed Tittel Ed Tittel Profile: Ed Tittel

You can call me “slow on the uptake” when it comes to figuring out how to take best advantage of advanced Windows 8 technologies if you like, but I’ve only recently realized that the best way to take advantage of SSDs and Intel’s Rapid Storage Technology and Rapid Start Technology requires building systems with disk architecture configured for RAID from the get-go. I’ve been using AHCI (the advanced host controller interface) as my default with SATA drives for years now, but have only recently learned how to use Rapid Start and a second SSD to boost Windows’ boot-up and shutdown behaviors (and times).

default-uefi-gpt

The default UEFI/GPT setting works fine for most smaller SSDs, but…

Having tried numerous proposed methods to switch an existing install from AHCI to RAID without success now, I’m reasonably convinced that selecting RAID in the BIOS for the motherboard’s (or system’s) SATA configuration setting prior to performing a Windows 8.* install (which means a UEFI install of Windows 8.1 on a GPT disk layout these days — at least, on most of my systems) is absolutely the right way to go. My desktops increasingly support two or more SSDs nowadays, and my Lenovo laptops accommodate mSATA SSDs as well as 2.5″ units of the same type, which means all of those systems can support both forms of Intel RST (Rapid Storage Technology and Rapid Start Technology as well). Even if you don’t use a RAID array of any kind, Rapid Start doesn’t work unless you configure the boot drive as RAID rather than AHCI (and with an SSD for the boot drive, there’s no real need to pair two drives together to boost performance for conventional hard disks).

There’s another potential wrinkle in this process that’s worth further reading and study — namely, the partitioning scheme when building a UEFI/GPT based boot/system drive for Windows 8.*. This is admirably documented in the TechNet article entitled “Configure UEFI/GPT-Based Hard Drive Partitions” but there is one proviso that may be worth considering — namely that default partition layouts may not always work exactly as expected. Let me explain: by default, Windows 8.* allocates 350 MB to the Windows Recovery Environment (WinRE) partition, 100 MB to the EFI System Partition (from whence Windows boots), and the rest of the space available on the drive to the OS partition where the visible file system will reside. On smaller SSDs, this allocation appears to work pretty well. But I’ve noticed on larger SSDs (256 GB or bigger) and conventional drives (most of which exceed 500 GB these days), some systems encounter problems when running Windows File History or when capturing a system image (using the System Image Backup option on the File History control panel element). That’s because they write such backups through the WinRE partition to the target drive, and may suffer when there’s insufficient free space in that partition to accommodate backup write activity. In such cases, you’ll want to override the default partition layout for your system, and allocate 500 GB of space (or more) to WinRE (please also follow the directives from the aforecited TechNet article about free space in that partition as well). A disk partition script (using DiskPart.exe) is available with the TechNet article, and worth both reading and using if you decide to depart from the defaults that Windows 8.* uses. An equivalent answer-file setup for SysPrep is also provided there as well.

1  Comment on this Post

 
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  • AdamLPoniatowski
    Hi Ed,

    On which RAID will this work best on? 0, 1, 5, or 10? As the layout which you wrote down, sounds like either 1 or 0.

    Will RAID 5 not slow it down?  it will be unnoticeable, probably.

    Thanks and kind regards,

    Adam Poniatowski 
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