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25 .\" $FreeBSD: src/share/man/man4/ataraid.4,v 1.10 2006/09/18 15:24:18 ru Exp $
33 .Nd "ATA software RAID support"
40 driver provides support for so-called software RAID
41 (sometimes referred to as fake RAID or pseudo RAID).
43 When a controller that supports software RAID is instructed to
44 create a RAID array, its BIOS writes data structures in a specific
45 metadata format to the disks.
46 These data structures are picked up by the
50 can work with the array.
53 driver has to understand the specific metadata format of a
54 controller BIOS in order to support its RAID capabilities.
56 Read-only support for a metadata format means that
58 can use the given RAID array for normal read/write operations.
59 Creation and rebuild of such arrays has to be done from the
62 Read and write support for a metadata format means that
64 can use the given RAID array for normal read/write operations.
67 utility can be used to create, rebuild, update and fail such
72 driver can read the following metadata formats:
78 Highpoint V2 RocketRAID
80 Highpoint V3 RocketRAID
84 Integrated Technology Express (ITE)
98 Silicon Integrated Systems (SiS)
107 driver can write the following metadata formats:
111 Highpoint V2 RocketRAID
119 Silicon Integrated Systems (SiS)
126 It is also possible to use software RAID on controllers
127 that do not have special software RAID capabilities.
132 .Bl -tag -width ".Pa /dev/ar*" -compact
134 ATA RAID device nodes
140 RAID5 is not supported at this time.
141 Code exists, but it neither uses nor maintains parity information.
146 driver was written by
147 .An S\(/oren Schmidt Aq Mt sos@FreeBSD.org .
148 This manual page was written by
149 .An Christian Brueffer Aq Mt brueffer@FreeBSD.org .