18.3. RAID0 - Striping

Written by Tom Rhodes i Murray Stokely.

Striping is a method used to combine several disk drives into a single volume. In many cases, this is done through the use of hardware controllers. The GEOM disk subsystem provides software support for RAID0, also known as disk striping.

In a RAID0 system, data are split up in blocks that get written across all the drives in the array. Instead of having to wait on the system to write 256k to one disk, a RAID0 system can simultaneously write 64k to each of four different disks, offering superior I/O performance. This performance can be enhanced further by using multiple disk controllers.

Each disk in a RAID0 stripe must be of the same size, since I/O requests are interleaved to read or write to multiple disks in parallel.

Disk Striping Illustration
Procedura 18.1. Creating a stripe of unformatted ATA disks
  1. Load the geom_stripe module:

    # kldload geom_stripe.ko
  2. Ensure that a suitable mount point exists. If this volume will become a root partition, then temporarily use another mount point such as /mnt:

    # mkdir /mnt
  3. Determine the device names for the disks which will be striped, and create the new stripe device. For example, the following command could be used to stripe two unused, unpartitioned ATA disks: /dev/ad2 and /dev/ad3.

    # gstripe label -v st0 /dev/ad2 /dev/ad3
  4. A partition table must be created on the new volume with the following command:

    # bsdlabel -wB /dev/stripe/st0
  5. This process should have created two other devices in the /dev/stripe directory in addition to the st0 device. Those include st0a and st0c. A file system must now be created on the st0a device using the following newfs command:

    # newfs -U /dev/stripe/st0a

    Many numbers will glide across the screen, and after a few seconds, the process will be complete. The volume has been created and is ready to be mounted.

The following command can be used to manually mount a newly created disk stripe:

# mount /dev/stripe/st0a /mnt

To mount this striped file system automatically during the boot process, place the volume information in /etc/fstab file:

# echo "/dev/stripe/st0a /mnt ufs rw 2 2" \
    >> /etc/fstab

The geom_stripe module must also be automatically loaded during system initialization, by adding a line to /boot/loader.conf:

# echo 'geom_stripe_load="YES"' >> /boot/loader.conf

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