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2-35
Cisco MDS 9200 Series Hardware Installation Guide
OL-17468-02
Chapter 2 Installing the Cisco MDS 9200 Series
Removing and Installing Components
Maintaining a Caching Services Module
Caution Maintenance should only be performed by qualified service personnel.
Note A minimum of two CSMs in each fabric are required for redundancy and data backup.
This section includes the following topics:
• Maintaining the Batteries on the Caching Services Module, page 2-35
• Maintaining the Disk Drives on the Caching Services Module, page 2-35
Maintaining the Batteries on the Caching Services Module
The CSM batteries last approximately three years. The following message displays in the system log
when a battery fails:
Dec 5 17:14:36 sw-90.21 %SVC_BATTERY-SLOT8-4-BATTERY_CAPACITY_LOW:
Battery capacity is below the required threshold.
A message also appears in the output of the show interface command.
If you see this message, contact your support provider for assistance. If a battery fails, the CSM must be
replaced.
Caution The CSM batteries are shipped fully charged and should be handled accordingly.
Warning
Do not touch or bridge the metal contacts on the battery. Unintentional discharge of the batteries can
cause serious burns.
Statement 341
Warning
Ultimate disposal of this product should be handled according to all national laws and regulations.
Statement 1040
The batteries are automatically charged on a periodic basis with an SMBus-compliant Level III smart
charger located on the CSM. The smart charger measures the charge and recharges the battery to full if
it is less than 90 percent of capacity.
The batteries are also automatically reconditioned on a periodic basis, one battery at a time. During
reconditioning all power is drained from the battery and the battery is completely recharged, requiring
approximately six hours. The Battery Status LED flashes green during the reconditioning.
Maintaining the Disk Drives on the Caching Services Module
A message displays in the system log when a disk drive requires replacement. If you see this message,
contact your support provider for assistance.
If a disk drive fails, the CSM must be replaced. The other CSM(s) in the fabric contain the same data,
and they can continue to provide caching services during the replacement period.