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Stopping I/O
When troubleshooting drive and connectivity faults, ensure you have a current full backup. As an
additional data protection precaution, stop all I/O to the affected vdisks.
IMPORTANT: Stopping I/O to a vdisk is a host-side task, and falls outside the scope of this document.
When on-site, you can verify that there is no I/O activity by briefly monitoring the system LEDs; however,
when accessing the storage system remotely, this is not possible. Remotely, you can use the
vdisk-statistics
1. Using the CLI, run the
The Number of Reads and Number of Writes outputs show the number of these operations that
have occurred since the statistic was last requested.
2. Run the
show vdisk-statistics
This provides you a specific window of time (the interval between requesting the statistics) to determine
if data is being written to or read from the disk.
3. If any reads or writes occur during this interval, a host is still reading from or writing to this vdisk.
Continue to stop IOPS from hosts, and repeat step 1 until the Number of Reads and Number of
Writes statistic are zero.
NOTE: See AssuredSAN 3000 Series CLI Reference Guide for additional information.
Shutting down a controller module
Shutting down the Storage Controller in a controller module ensures that a proper failover sequence is
used, which includes stopping all I/O operations and writing any data in write cache to disk. If the
Storage Controller in both controller modules is shut down, hosts cannot access the system's data. Perform
a shut down before removing a controller module or powering down the system.
CAUTION: You can continue to use the CLI when either or both Storage Controllers are shut down, but
information shown might be invalid.
Use RAIDar or the CLI to perform a shut down.
Using RAIDar
1. Sign-in to RAIDar using default user manage and password !manage.
If the default user or password — or both — have been changed for security reasons, enter the secure
login credentials instead of the system defaults shown above.
2. In the Configuration View panel, right-click the system and select Tools > Shut Down or Restart
Controller.
3. In the main panel, set the options:
• Select the Shut down operation.
• Select whether to restart the processor in controller A, B, or both.
4. Click Shut down now. A confirmation dialog appears.
5. Click Yes to continue; otherwise click No. If you clicked Yes, a second confirmation dialog appears.
6. Click Yes to continue; otherwise click No. If you clicked Yes, a message describes shutdown activity.
NOTE: If an iSCSI port is connected to a Microsoft Windows host, the following event is recorded
in the Windows event log: Initiator failed to connect to the target.
command to determine if input and output has stopped. Perform the steps below:
show vdisk-statistics
command a second time.
AssuredSAN 3000 Series FRU Installation and Replacement Guide
command.
show
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