LSI 3ware 9750 User Manual page 221

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Rescanning is useful in a variety of maintenance tasks. For example, if you
physically plug in a drive and want the controller to recognize the newly
plugged-in drive, Rescan will find it.
Note:
If you unplug a drive without first removing it through 3DM2, Rescan may not
recognize it as gone unless the drive was in use or until it is required by the system.
Always use the Remove link to remove a drive before unplugging it.
Warning:
Physically removing or adding drives which are not in hot swap bays can
result in a system hang or may even damage the system and the drive.
Rescan checks all ports. It checks empty ports for newly plugged-in drives. If
those drives were previously part of a 3ware RAID configuration and they
still have valid DCB (Disk Configuration Block) information on them, the
controller tries to piece them back together into a working unit. If a working
unit can be formed, it will appear in the Unit Maintenance list when the scan
is complete, and the operating system will be notified of the unit.
• In Linux, FreeBSD, or OpenSolaris a device node will be associated with
each unit created.
• In Windows, you will see additional disk(s) report under Disk
Management..
• In Mac OS, the unit shows up under Disk Utility.
• In VMware you need to use vShere client and go to the Configuration
page. Under Storage Adapter, select LSI 3ware 9750 and perform a rescan
for the disk to be available for use.
This process is known as importing drives.
If new drives do not have any data indicating they were previously part of a
3ware RAID configuration, they will appear in the Available Drives list.
In addition, if there is a unit with the status Inoperable before a rescan (for
example, a RAID 5 unit missing 2 or more drives), and a rescan finds drives
that complete the unit, the inoperable unit will become a valid unit.
Unit Maintenance
The Unit Maintenance section of the page lists all existing units on the current
controller, and displays summary information about them.
The top row shows information about the unit, while subsequent rows show
summary information about each drive in the unit.
Maintenance page
209