- Drive capacity
- Drive interface (such as FC, SAS, or SATA)
- T10 PI support
Attention
Before you power on a DS3950 storage subsystem without any internal
drive slots, the DS3950 must be cabled to at least one storage expansion
enclosure populated with at least two E-DDMs. If at least two E-DDMs are
not installed in each attached storage expansion enclosure when you power
on the DS3950 storage subsystem, your standard storage partition key will
be lost and will need to be regenerated using instructions on the IBM
Solutions and Premium Features Web site:
https://www-912.ibm.com/PremiumFeatures/
Additionally, if at least two E-DDMs are not installed in each attached
storage expansion enclosure, the resulting insufficient load to the storage
expansion enclosure power supply FRUs might cause the storage expansion
enclosure power supply FRUs to intermittently appear as failed and then
reappear in an optimal state, falsely indicating that the power supply FRUs
are bad.
v
E-DDM FRU labels:
A label is provided on the front of each E-DDM. Use this
label to record the location information for each E-DDM before you remove it.
Ensure that you keep track of the E-DDMs and their corresponding bays. Also,
record the location information in Table 25 on page 108. If you install an E-DDM
in the wrong bay, you might lose data.
v
Drive LEDs:
Each E-DDM FRU tray has two associated LEDs, a green Activity
LED and an amber Fault LED. These LEDs indicate the status for that E-DDM.
See Table 20 for the drive LED states and descriptions.
v
E-DDM FRUs are not interchangeable between the EXP395 and other storage
expansion enclosures such as EXP710s.
Table 20. Drive LED activity
LED
LED state
Descriptions
Activity LED
Flashing green The green LED flashes to indicate fibre-channel activity to
the drive.
Activity LED
Steady green
The green LED lights to indicate that the drive is properly
installed and is spun up by the DS3950 controller.
Fault LED
Flashing
amber
The amber LED flashes to indicate that a drive has been
identified by the software.
Fault LED
Steady amber
The amber LED lights to indicate a drive failure. The green
activity LED will be flashing one every 2 seconds if the
DS3950 storage subsystem is spinning down the drive. The
drive can also be put in a failed state if the drive is not
certified for the DS3950 storage subsystem that the EXP395
is connected to, or the installed controller firmware version
is not the required version to support the drive. Use the
DS3950 storage subsystem Management window to verify
that this is the case and replace the drive with the drive
option or FRU that is certified for that particular storage
subsystem, or upgrade the controller firmware to the
required version to support the inserted disk drive.
Chapter 5. Installing and replacing components
69
Summary of Contents for DS3950
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