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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chs(7D) Devices chs(7D)
NAME
chs - IBM ServeRAID PCI host adapter driver
DESCRIPTION
The chs driver is the IBM ServeRAID PCI controller driver.
PRECONFIGURATION
Known Problems and Limitations
To prevent data loss, a SCSI disk drive that is not defined as part of any physical pack within a logical drive will not be accessible
through the Solaris operating environment.
CONFIGURATION
Auto-configuration code determines whether the adapter is present at the configured address and what types of devices are attached to it.
The IBM ServeRAID is primarily used as a disk array (system drive) controller.
To configure the attached disk arrays, you must configure the controller (using the configuration utilities provided by the hardware manu-
facturer) before booting the Solaris operating environment You use the configuration utilities to set RAID levels, stripe parameters, cache
mechanisms and perform other functions. For more information, see the user manual supplied with your hardware.
FILES
/kernel/drv/chs.conf chs configuration file
/dev/dsk/cndn[s|p]n block device
/dev/rdsk/cndn[s|p]n raw device where:
cn controller n
dn LUN n (0-7)
sn UNIX system slice n (0-15)
pn fdisk(1M) partition(0)
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Architecture |x86 |
+-----------------------------+-----------------------------+
SEE ALSO
fdisk(1M), attributes(5), cmdk(7D)
SunOS 5.10 27 November 2000 chs(7D)