HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 143

Private LAN Dual Pathing, Managing Cartridges

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• A double path failure that occurs upon booting the system results in the critical alert Missing Storage LUN paths on node #. This means the node can not communicate with the LUN at all. If the failed paths are on the primary node, the whole storage pool containing that LUN is off-line; if the failed paths are on a secondary node, the storage pool is on-line until reboot, but the storage pool is inaccessible from that node. In this case, you can still get to the LUNs, but only from a different node. To repair double path failure (assuming there has been no reboot during the failure): 1. Determine the cause of the failures and repair them if needed. 2. In Command View VLS, access the System tab. 3. Select Storage LUNs from the navigation tree. 4. Select Fix Primary Paths from the task bar to display the Fix Primary Paths Wizard. 5. Select Apply to set all paths back to their original settings. CAUTION: If you attempt to reboot during a path failure without first repairing the failure, the array might reassign paths or fail-over preferences. This will limit device performance because all data traffic will be routed through a single controller. To restore performance, from Command View EVA: 1. Reset path fail-over preferences for each LUN to no preference. 2. Save the presentation. 3. Reset the path fail-over preferences back to their original values. 4. Save the presentation. 5. Reboot the VLS system. Private LAN Dual Pathing The private LAN on the VLS12000 has dual pathing which consists of a cable from each switch to each node. If a LAN switch or a path to a LAN switch fails, the data transfer will automatically fail-over to the other available switch. • The primary path is through NIC 2 of the switch and is referred to in the error notification as eth1. If the LAN switch associated with NIC2 fails, the Notifications tab will display all eth1 failures. • The secondary path is through the USB LAN cable and is identified as eth2 in the error notification. If the LAN switch associated with the USB LAN cable fails, the Notifications tab will display all eth2 failures. • If both paths fail, the critical alert will identify bond 0 as the combined failed path. If both paths from the private LAN to a secondary node fails, the node is off-line; but if both paths to a primary node fails, the whole device is off-line. When a failure occurs, repair the failure. In most cases, the system will automatically recognize that the repair is complete and restore the path or paths without having to reboot the system; however, you may need to reboot the system if the repair includes installing a new USB LAN adapter. Managing Cartridges You can change the following parameters for existing cartridges from the Cartridge Parameters window: • Library with which they are associated HP StorageWorks 12000 Gateway Virtual Library System User Guide 143

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•
A double path failure that occurs upon booting the system results in the critical alert
Missing Storage
LUN paths on node #
.
This means the node can not communicate with the LUN at all. If the failed paths are on the primary
node, the whole storage pool containing that LUN is off-line; if the failed paths are on a secondary
node, the storage pool is on-line until reboot, but the storage pool is inaccessible from that node. In
this case, you can still get to the LUNs, but only from a different node.
To repair double path failure (assuming there has been no reboot during the failure):
1.
Determine the cause of the failures and repair them if needed.
2.
In Command View VLS, access the System tab.
3.
Select
Storage LUNs
from the navigation tree.
4.
Select
Fix Primary Paths
from the task bar to display the
Fix Primary Paths Wizard
.
5.
Select
Apply
to set all paths back to their original settings.
CAUTION:
If you attempt to reboot during a path failure without first repairing the failure, the array might reassign
paths or fail-over preferences. This will limit device performance because all data traffic will be routed
through a single controller. To restore performance, from Command View EVA:
1.
Reset path fail-over preferences for each LUN to no preference.
2.
Save the presentation.
3.
Reset the path fail-over preferences back to their original values.
4.
Save the presentation.
5.
Reboot the VLS system.
Private LAN Dual Pathing
The private LAN on the VLS12000 has dual pathing which consists of a cable from each switch to
each node. If a LAN switch or a path to a LAN switch fails, the data transfer will automatically fail-over
to the other available switch.
•
The primary path is through NIC 2 of the switch and is referred to in the error notification as
eth1
.
If the LAN switch associated with NIC2 fails, the Notifications tab will display all
eth1
failures.
•
The secondary path is through the USB LAN cable and is identified as
eth2
in the error notification.
If the LAN switch associated with the USB LAN cable fails, the Notifications tab will display all
eth2
failures.
•
If both paths fail, the critical alert will identify
bond 0
as the combined failed path. If both paths
from the private LAN to a secondary node fails, the node is off-line; but if both paths to a primary
node fails, the whole device is off-line.
When a failure occurs, repair the failure. In most cases, the system will automatically recognize that
the repair is complete and restore the path or paths without having to reboot the system; however,
you may need to reboot the system if the repair includes installing a new USB LAN adapter.
Managing Cartridges
You can change the following parameters for existing cartridges from the Cartridge Parameters
window:
•
Library with which they are associated
HP StorageWorks 12000 Gateway Virtual Library System User Guide
143