Stopping I/O - R/Evolution 2000 Series Troubleshooting Manual

4. Look for red text in the panels.
Red text indicates where the fault is occurring. In Figure 4-1 for example, the panels
indicate a fault related to controller module B.
5. To gather more details regarding the failure, click linked text next to the fault icon.
The associated status page is displayed.
6. Review the information displayed in the status page.
If the fault relates to a controller module or power module, an image of the
enclosure is displayed.
The module is shaded red if it has a fault or is powered off.
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The module is overlaid with the words "NOT INSTALLED" if it is absent or not
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fully inserted.

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
virtual disks. 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.
To check the I/O status of a remote system, use the Monitor > Statistics > Overall
Rate Stats page. The Overall Rate Stats page enables you to view I/O based on the
host-side activity interval since the page was last refreshed. The page automatically
refreshes at a 60-second interval. The following data is presented for all virtual
disks:
The total IOPS and bandwidth for all virtual disks
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The IOPS and bandwidth for each virtual disk
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To use the Overall Rate Stats page to ensure that all I/O has ceased on a remote
system:
1. Quiesce host applications that access the storage system.
2. Select Monitor > Statistics > Overall Rate Stats.
38 R/Evolution 2000 Series Troubleshooting Guide • May 2008