Dell POWERVAULT MD1000 - Manual (Page 34)

36 Installing Enclosure Components
Removing and Installing an EMM
An enclosure with redundant enclosure management contains two EMMs and can be configured in
either a unified mode or split mode. An enclosure with nonredundant enclosure management consists of
one EMM configured in unified mode.
If only one EMM is installed in your enclosure, the empty slot must contain a blank cover. The blank
cover ensures that the enclosure has the proper cooling airflow to prevent overheating. For information
on installing the blank cover, see "Installing an EMM Module Cover in an Empty Bay."
NOTICE: EMMs can be removed and installed without shutting down the enclosure. However, removing an EMM
while data traffic is occurring that involves that EMM could cause data loss and is not recommended. Replacing or
reinserting an EMM that is connected to a host will cause the host to lose communication with the enclosure and
will require a reboot of the host server. For more information, see "Troubleshooting a Loss of Communication
Condition."
NOTICE: To prevent damage to your enclosure, you should wear a wrist grounding strap while performing the
following procedures. See your Product Information Guide for safety information.
Removing an EMM
NOTICE: If you remove an EMM from an enclosure operating in split mode while connected to a host server, you
will lose connection to the drives attached to the removed EMM.
1 Push up on the release tab on the left side of the module (see Figure 3-5).
2 At the same time, pull out on the release lever. When the lever is pulled out, the EMM partially ejects
from the enclosure.
3 Remove the module from the enclosure and place it on a flat, secure surface.
NOTE: To avoid damage to the sensitive EMI contacts on the bottom of the EMM, do not stack EMMs or
place them on a hard surface.