diff options
| author | mav <mav@FreeBSD.org> | 2012-04-30 17:53:02 +0000 |
|---|---|---|
| committer | mav <mav@FreeBSD.org> | 2012-04-30 17:53:02 +0000 |
| commit | dbcc3abc523ff7cb6a79aff875fce65fdb715261 (patch) | |
| tree | 6a05d16f8e20c1c50eac8e7a26f0f316e65debcd /sbin/geom | |
| parent | 4f2a8a3a321ff12581a772dd9ca97d03ab81bd4d (diff) | |
| download | FreeBSD-src-dbcc3abc523ff7cb6a79aff875fce65fdb715261.zip FreeBSD-src-dbcc3abc523ff7cb6a79aff875fce65fdb715261.tar.gz | |
Add to GEOM RAID class module, supporting the DDF metadata format, as
defined by the SNIA Common RAID Disk Data Format Specification v2.0.
Supports multiple volumes per array and multiple partitions per disk.
Supports standard big-endian and Adaptec's little-endian byte ordering.
Supports all single-layer RAID levels. Dual-layer RAID levels except
RAID10 are not supported now because of GEOM RAID design limitations.
Some work is still to be done, but the present code already manages basic
interoperation with RAID BIOS of the Adaptec 1430SA SATA RAID controller.
MFC after: 1 month
Sponsored by: iXsystems, Inc.
Diffstat (limited to 'sbin/geom')
| -rw-r--r-- | sbin/geom/class/raid/graid.8 | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sbin/geom/class/raid/graid.8 b/sbin/geom/class/raid/graid.8 index e9fd5a4..75c0bd9 100644 --- a/sbin/geom/class/raid/graid.8 +++ b/sbin/geom/class/raid/graid.8 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd April 19, 2012 +.Dd April 30, 2012 .Dt GRAID 8 .Os .Sh NAME @@ -200,6 +200,19 @@ The GEOM RAID class follows a modular design, allowing different metadata formats to be used. Support is currently implemented for the following formats: .Bl -tag -width "Intel" +.It DDF +The format defined by the SNIA Common RAID Disk Data Format v2.0 specification. +Used by some Adaptec RAID BIOSes and some hardware RAID controllers. +Because of high format flexibility different implementations support +different set of features and have different on-disk metadata layouts. +To provide compatibility, the GEOM RAID class mimics capabilities and +metadata layout of the first detected DDF array. +Respecting that, it may support different number of disks per volume, +volumes per array, partitions per disk, etc. +The following configurations are supported: RAID0 (2+ disks), RAID1 (2+ disks), +RAID1E (3+ disks), RAID3 (3+ disks), RAID4 (3+ disks), RAID5 (3+ disks), +RAID5E (4+ disks), RAID5EE (4+ disks), RAID5R (3+ disks), RAID6 (4+ disks), +RAIDMDF (5+ disks), RAID10 (4+ disks), SINGLE (1 disk), CONCAT (2+ disks). .It Intel The format used by Intel RAID BIOS. Supports up to two volumes per array. |
