Your FlashSystem™ V840 supports up to 12 flash modules, accessible
from the front of the enclosure.
Each flash module has a raw capacity of
1 TB, 2 TB, or 4 TB of flash memory.
The maximum usable storage capacity of an enclosure is based on the
following factors:
- In a RAID 5 configuration, one flash module is reserved as an
active spare, and capacity equivalent to one module is used to implement
a distributed parity algorithm. Therefore, the maximum usable capacity
of a RAID 5 configuration is 40 TB.
- The maximum usable capacity of a RAID 0 configuration is 48 TB,
as there are no spare or parity flash modules.
Flash modules are installed based
on the configuration guidelines in
Table 1. For optimal cooling of the enclosure,
if there are fewer than 12 flash modules, they are installed beginning
in the center pair of slots and added in pairs on either side until
all 12 slots are populated.
Table 1. Supported flash module configurations| Number of flash modules |
RAID Support |
Slot 1 |
Slot 2 |
Slot 3 |
Slot 4 |
Slot 5 |
Slot 6 |
Slot 7 |
Slot 8 |
Slot 9 |
Slot 10 |
Slot 11 |
Slot 12 |
|---|
| 2 |
RAID 0 |
|
|
|
|
|
X |
X |
|
|
|
|
|
| 4 |
RAID 0, RAID 5 |
|
|
|
|
X |
X |
X |
X |
|
|
|
|
| 6 |
RAID 0, RAID 5 |
|
|
|
X |
X |
X |
X |
X |
X |
|
|
|
| 8 |
RAID 0, RAID 5 |
|
|
X |
X |
X |
X |
X |
X |
X |
X |
|
|
| 10 |
RAID 0, RAID 5 |
|
X |
X |
X |
X |
X |
X |
X |
X |
X |
X |
|
| 12 |
RAID 0, RAID 5 |
X |
X |
X |
X |
X |
X |
X |
X |
X |
X |
X |
X |
- RAID 5 is supported with configurations of 4, 6, 8, 10, and
12 flash modules. RAID 0 is supported with configurations of 2, 4, 6, 8, 10, and
12 flash modules.
- During system setup in the storage enclosure management GUI, the
system automatically configures RAID settings based on the number
of flash modules in the system. For systems with four or more flash
modules, RAID 5 is used. If the storage enclosure management GUI is
used, the system automatically configures RAID 0 for systems with
two flash modules. The system supports RAID 0 for larger numbers
of flash modules, but the configuration must be completed using the
command-line interface (CLI).
- All flash modules installed in the enclosure must be identical
in capacity and type.
- If fewer than 12 modules are installed, flash module fillers must
be installed in the empty bays to maintain cooling airflow in the
system enclosure.
Attention: Flash modules
are warm-swappable in RAID 5 only. Data will be lost in RAID 0
mode if flash modules are warm-swapped. Only one flash module
may be warm-swapped at a time; the physical order of the flash modules
must be maintained. Wait for the new flash module to come online before
swapping any additional flash modules.
Attention: It is recommended that the storage
enclosure remain powered on, or be powered on periodically, to retain
array consistency. The storage enclosure can be safely powered down
for up to 90 days, in temperatures up to 40 degrees C (104 degrees
Fahrenheit). Although the flash modules will retain data if the enclosure
is temporarily disconnected from power, if the system is powered off
for a period of time exceeding 90 days, data might be lost.