User's Manual

62 Quick Access to Storage Status and Tasks
Related Information:
• I/O and Reboot Requirements for Detecting Physical Disk Status Changes
• Time Delay in Displaying Configuration Changes
Time Delay in Displaying Configuration Changes
When you change the storage configuration, Storage Management quickly
generates SNMP traps in response to the configuration changes. The Storage
Management MIB (Management Information Base) is also updated to reflect
storage configuration changes. However, it may take up to five minutes to
update the MIB with the most recent storage configuration. For this reason,
there is a time delay of up to five minutes between the receipt of an SNMP
trap and the ability to identify the configuration changes by querying the
Storage Management MIB. This time delay is particularly notable when
creating a new virtual disk or performing an unmirror or split mirror on a
RAID 1-concatenated virtual disk. You can minimize this time delay by
performing a controller rescan. For more information, see Rescan Controller.
I/O and Reboot Requirements for Detecting
Physical Disk Status Changes
This section applies to PERC 4/SC, 4/DC, 4e/DC, 4/Di, 4e/Si, and 4e/Di controllers
Because of hardware restrictions, the PERC 4/SC, 4/DC, 4e/DC, 4/Di, 4e/Si,
and 4e/Di controllers do not detect a physical disk status change until I/O is
attempted or the system is rebooted.
If the controller has an open communication path to the disk, then
performing an I/O operation on the controller updates the disk status. For
example, when an unconfigured disk is removed, the controller may not
detect the change until a manual rescan is done or other I/O operations are
attempted. Likewise, displaying a status change of a virtual disk or one of its
member physical disks may require that you do an I/O operation on the
controller on which the virtual disk resides.
If, however, the controller has lost the communication path, then rebooting
the system is required to update the disk status. Communication loss is
evident if the operating system generates I/O errors when you attempt to
access data, even though Storage Management displays the disk status as