Dell PowerVault MD1120 - Manual (Page 16)

16
About Your System
Unified Mode and Split Mode
The enclosure can run in one of two modes:
• Unified
• Split
In unified mode, a SAS host can communicate with up to 24 physical disks in
the enclosure via a single EMM, or up to 72 physical disks in three enclosures
daisy chained together. In split mode, the enclosure is split into two virtual
groups, with up to 12 consecutive physical disks (slots 12-23) controlled by
the
primary (left) EMM. The remaining physical disks (slots 0-11) are
6 EMM Status
LED
(green/amber) Solid green: EMM is functioning
properly.
Solid amber: The enclosure did not boot
or was not properly configured.
Off: EMM did not boot, is not properly
configured, or communication between
the EMM and the server is lost.
Green flashing (250 ms): Firmware
download in progress.
Amber flashing (On 250 ms Off 250 ms
[once]; Off 1000 ms): Communication
between SAS expander and enclosure
processor could not be established.
Amber flashing (On 250 ms Off 250 ms
[twice]; Off 1000 ms): Enclosure
processor unable to communicate with
enclosure devices.
Amber flashing (On 250 ms Off 250 ms
[three times]; Off 1000 ms): SAS
expander is not properly configured.
Amber flashing (On 250 ms Off 250 ms
[five times]; Off 1000 ms): Firmware
revisions between EMMs are different.
Both EMM LEDs will blink.
Table 1-4. EMM Component Functions (continued)
Item Component Icon Function