09-12-2001
Protection
Obviously, RAID is there to protect you from disasters. The various RAID levels present you each a mix of disk space and safety level. If the server is critical I would definatively recommend RAID 1 (mirror disks) on the core OS components.
Upgrading to RAID afterwards will greatly depend on the RAID HW and OS. But usually you have an exhaustive list of 'RAID migration' paths and surely going from no RAID to RAID 1 should be possible.
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MPII(4) BSD Kernel Interfaces Manual MPII(4)
NAME
mpii -- LSI Logic Fusion-MPT Message Passing Interface II
SYNOPSIS
mpii* at pci? dev ? function ?
DESCRIPTION
The mpii driver provides support for storage controllers using the LSI Logic Fusion-MPT Message Passing Interface II family of chipsets:
- LSISAS2004, LSISAS2008
These chipsets can be found on the following controllers:
- Dell PERC H200
- LSI SAS 9200-8e, SAS 9211-4i, SAS 9211-8i
Some models of these controllers have varying degrees of support for RAID 0 and RAID 1.
mpii supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands.
EVENTS
The mpii driver is able to send events to powerd(8) if a logical drive in the controller is not online. The state-changed event will be sent
to the /etc/powerd/scripts/sensor_drive script when such condition happens.
SEE ALSO
intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8)
HISTORY
The mpii driver first appeared in OpenBSD 4.7.
AUTHORS
The mpii driver was written by James Giannoules and Mike Belopuhov.
BUGS
The chips supported by mpii do not use a SCSI-like identifier. Instead they use an opaque ID and leave discovery order up to the operating
system. The code to handle this is currently not implemented and therefore it is not a good idea to run this driver on a multi-boot machine
or with more than 1 drive.
BSD
April 19, 2012 BSD