HP StorageWorks 2300 Modular Smart Array reference guide (500911-001, January 2009)

HP StorageWorks 2300 Modular Smart Array reference guide 67
5 Using system utilities
Resetting a host port
Making a configuration or cabling change on a host might cause the storage system to stop accepting I/O
requests from that host. For example, this problem can occur after moving host cables from one HBA to
another on the host. To fix such a problem you might need to reset controller host ports (channels). For a
Fibre Channel host port configured to use FC-AL (loop) topology, a reset issues a loop initialization
primitive (LIP).
To reset a host port
1. In the Configuration View panel, right-click the system and select Tools > Reset Host Port.
2. Select the port to reset. For example, to reset controller A port 1, select A1.
3. Click Reset Host Port.
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.
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. Leftover and Available disks are selectable.
Available disks are considered to have had their metadata cleared, but are selectable in case a disk
with partial metadata has been inserted into the system.
3. Click Clear Metadata. When processing is complete a success dialog appears.
4. Click OK.