RETAIN tip: H205201
After 994 days of continuous up-time, an Environmental Service Module (ESM) will reboot. Depending on the specifics of your configuration, there is a very slight chance that two ESMs could reboot at the same time causing a temporary loss of access to your data.
The system is configured with one or more of the following IBM Options:
- EXP100 SATA Storage Expansion Unit (1710-10U), any model
- EXP700 Expansion Unit, type 1740, any model
- EXP710 Storage Enclosure (1740-710), any model
This tip is not system specific.
This tip is not software specific.
Plan a maintenance window to reboot the ESMs before they reach 994 days of continuous up-time. This can be performed in a few different ways. Here are two examples:
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- Reload the same version of ESM firmware, as this will systematically reboot each ESM in the configuration. In general, this procedure is a concurrent operation. However, refer to the Readme file in the ESM/Hard Disk Drive (HDD) 1.77 or later package for any restrictions related to this operation.
- Power Cycle the entire configuration, making sure to follow proper order of powering down and powering up.
Due to a hardware limitation in the up-time counter of the affected storage enclosures, the ESMs must reboot after 994 days of up-time. There is no fix for this issue.
Unfortunately, there is no reliable technical method to determine exactly how long it has been since the last time the ESMs rebooted.