Additional arrays, if present, will be r1 , r2 , and so on. The BIOS menu on some of these devices can create arrays with special characters in their names. To avoid problems with those special characters, arrays are given simple numbered names like r0. To show the actual labels, like gm0 in the example above, use sysctl 8 :. Some software RAID devices support more than one volume on an array.
Volumes work like partitions, allowing space on the physical drives to be split and used in different ways. This example creates a 40 G mirror for safely storing the operating system, followed by a 20 G RAID0 stripe volume for fast temporary storage:. An array with two volumes will show r0 and r1. See graid 8 for the number of volumes supported by different software RAID devices.
Under certain specific conditions, it is possible to convert an existing single drive to a graid 8 array without reformatting. To avoid data loss during the conversion, the existing drive must meet these minimum requirements:.
The drive must be partitioned with the MBR partitioning scheme. GPT or other partitioning schemes with metadata at the end of the drive will be overwritten and corrupted by the graid 8 metadata.
There must be enough unpartitioned and unused space at the end of the drive to hold the graid 8 metadata. This metadata varies in size, but the largest occupies 64 M, so at least that much free space is recommended.
If the drive meets these requirements, start by making a full backup. Then create a single-drive mirror with that drive:. Do I need to rebuild my soft-raids, or will they still run? What is the proposed upgrade strategy? I've yet only installed and not configured a disk mirror. I've thought to use gmirror , what advantages are there by using graid? Is it faster? More reliable? New features? Why should I not depend on the legacy ata 4 subsystem if it works?
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Please forgive my ignorance. Thanks, Izydor. Glad it helped! Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed.
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