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Full Discussion: Software RAID configuration
Operating Systems Linux Red Hat Software RAID configuration Post 302449995 by pludi on Wednesday 1st of September 2010 06:36:53 AM
Old 09-01-2010
The choice of RAID level is based more on the number of available disks (read: budget) than the application using it. Typically, only 3 (4) types are used in practice:
  • RAID1 (mirroring) halves the available space, but the RAID is still available with either disk failing. A special case of that is RAID1+0 (RAID10), which combines the security of RAID1 with the speed of RAID0.
  • RAID5 (striping with parity) will cost you one disk out of the total, but it's fast and easy to set up. But as soon as more than 1 disk fails the whole array is gone.
  • RAID6 (striping with double parity) is like RAID5, only you'll loose 2 disks worth of space, and up to 2 drives can fail at the same time.

Setting up RAID on disks already in use is tedious and very very very dangerous. Don't attempt it unless you know what you're doing and have a proven good backup.
 

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HPT27XX(4)						   BSD Kernel Interfaces Manual 						HPT27XX(4)

NAME
hpt27xx -- HighPoint RocketRAID 27xx SAS 6Gb/s HBA card driver SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device hpt27xx Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): hpt27xx_load="YES" DESCRIPTION
The hpt27xx driver provides support for HighPoint's RocketRAID 27xx based RAID controller. These devices support SAS disk drives and provide RAID0 (striping), RAID1 (mirroring), and RAID5 functionality. HARDWARE
The hpt27xx driver supports the following SAS controllers: o HighPoint's RocketRAID 271x series o HighPoint's RocketRAID 272x series o HighPoint's RocketRAID 274x series o HighPoint's RocketRAID 276x series o HighPoint's RocketRAID 278x series NOTES
The hpt27xx driver only works on the i386 and amd64 platforms as it requires a binary blob object from the manufacturer which they only sup- ply for these platforms. The hpt27xx driver does not work on i386 with pae(4) enabled. SEE ALSO
kld(4), kldload(8), loader(8) HISTORY
The hpt27xx device driver first appeared in FreeBSD 10.0. AUTHORS
The hpt27xx device driver was written by HighPoint Technologies, Inc.. This manual page was written by Xin LI <delphij@FreeBSD.org> for iXsystems, Inc. BSD
December 28, 2011 BSD
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