Filter
Top Products
62 Using system tools
Rescanning disk channels
A rescan forces a rediscovery of disks and enclosures in the storage system. If two Storage Controllers are
online, rescan also reassigns the enclosure IDs of attached enclosures based on controller A's enclosure
cabling order. A manual rescan may be needed after system power-up to display enclosures in the proper
order. A manual rescan temporarily pauses all I/O processes, then resumes normal operation. It can take
up to two minutes for the enclosure IDs to be corrected.
A manual rescan is not needed after inserting or removing disks; the controllers automatically detect these
changes. When disks are inserted they are detected after a short delay, which allows the disks to spin up.
To rescan disk channels
1. Verify that both controllers are operating normally.
2. In the Configuration View panel, right-click the system and select Tools > Rescan Disk Channels.
3. Click Rescan.
Clearing disk metadata
Each disk has metadata that identifies whether the disk is a member of a vdisk, and identifies other
members of that vdisk. If a disk's metadata says the disk is a member of a vdisk but other members'
metadata say the disk isn't a member, the disk becomes a leftover. The system overview and enclosure
overview pages show the disk's How Used value as LEFTOVR. A leftover disk’s Fault/UID LED is illuminated
amber.
Before you can use the disk in a new vdisk or as a spare, you must clear the disk's metadata.
To clear metadata from leftover disks
1. In the Configuration View panel, right-click the system and then select Tools > Clear Disk Metadata.
2. In the main panel, select disks to clear metadata from.
3. Click Clear Metadata. When processing is complete a success dialog appears.
4. Click OK.
Restarting or shutting down controllers
You can restart the processors in a controller module when SMU informs you that you have changed a
configuration setting that requires restarting or when the controller is not working properly. Shut down the
processors in a controller module before you remove it from an enclosure, or before you power off its
enclosure for maintenance, repair, or a move.
A restart can be performed on either the Storage Controller processor or the Management Controller
processor. A shut down affects both processors.
Restarting
If you restart a Storage Controller, it attempts to shut down with a proper failover sequence, which includes
stopping all I/O operations and flushing the write cache to disk, and then the controller restarts. The
Management Controller is not restarted so it can provide status information to external interfaces.
If you restart a Management Controller, communication with it is lost until it successfully restarts. If the
restart fails, the partner MC remains active with full ownership of operations and configuration information.
CAUTION: If you restart both controller modules, you and users lose access to the system and its data until
the restart is complete.