EMC
®
VNX
™
Procedure Generator
EMC CONFIDENTIAL
version: 4.5
4 of 51
Handling Field Replaceable Units (FRUs)
This section describes precautions you must take and general procedures you must follow when removing,
installing, or storing field-replaceable units (FRUs). The procedures in this section apply to FRU handling
during hardware upgrades as well as during general replacement.
FRUs and Power Issues
FRUs are designed to be powered up at all times. This means you can replace FRUs and accomplish most
hardware upgrades while the cabinet is powered up. To maintain proper airflow for cooling and to ensure
EMI compliance, make sure all front bezels, filler panels, and filler modules are reinstalled after the FRU
replacement or hardware upgrade is completed. Do not remove a faulty FRU from the system until you have
a replacement available.
CAUTION:
When you want to power down a storage processor enclosure (SPE), turn off the power
switch on the enclosure’
s standby power supply (SPS). Never turn off the SPE’s power supply
switches. Turning off the SPE power supply switches instead of the SPS power switch shuts down
the storage processors before they have enough time to save the write-cache data to the vault
drives. This causes data loss.
If write-cache data is not saved, the storage processor log displays an error message similar to the
following:
Enclosure 0 Disk 5 0x90a (Can’t Assign - Cache Dirty) 0 0xafb40 0x14362c
.
If you see this error message, contact Customer Service immediately.
Avoiding Electrostatic Discharge (ESD) damage
When replacing or installing FRUs, you can inadvertently damage the sensitive electronic circuits in the
equipment by simply touching them. Electrostatic charge that has accumulated on your body discharges
through the circuits. If the air in the work area is very dry, running a humidifier in the work area helps
decrease the risk of ESD damage. You must use the following procedures to prevent damage to the
equipment, so read the following instructions carefully.
Provide enough room to work on the equipment. Clear the work site of any unnecessary materials or
materials that naturally build up electrostatic charge, such as foam packaging, foam cups, cellophane
wrappers, and similar items.
Do not remove replacement or upgrade FRUs from their antistatic packaging until you are ready to
install them.
Gather the ESD kit and all other materials you will need before you service a component. Once
servicing begins, you should avoid moving away from the work site; otherwise, you may build up an
electrostatic charge.
Use the ESD kit when handling any FRU.
If an emergency arises and the ESD kit is not available, follow the procedures in the section
procedures (without an ESD kit)
Use the ESD wristband that is supplied with your system.
