3DM 2 Reference
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Information about the Maintenance page is organized under these headings:
• Rescan Controller
• Unit Maintenance
• Maintenance Task Buttons
• Available Drives (to Create Units)
Rescan Controller
Use the Rescan Controller button to have 3DM scan the ports. Rescanning
updates the list of available drives shown. It also updates the status of all
ports, so if error conditions have been fixed, the status is updated to reflect
that. This is useful in variety of maintenance tasks. For example, if you
physically plug in a drive and want the controller to recognize the newly
plugged in drive, use Rescan.
Note: If you unplug a drive without first removing it through 3DM,
Rescan will 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. This is required for
controllers earlier than the 9550SX models, and recommended for
9550SX and 9590SE models.
Warning: Physically removing or adding drives which are not in
hotswap carriers can result in a system hang or may even damage
the system and the drive.
In 9000-series controllers, 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 or FreeBSD, a device node will be associated
with each unit created. In Windows, the device manager will reflect the
changes under the disk drives icon. 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.
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