Dell PowerVault MD1000 Hardware Owners Manual - Page 14
Unified Mode and Split Mode, left EMM. - configure
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Table 1-4. EMM Component Functions (continued) Item Component Icon 6 EMM Status LED (green/amber) Function 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 expanders 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): One or more SAS expanders 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. 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 15 drives in the enclosure via a single EMM, or up to 45 drives in three enclosures daisy chained together. In split mode, the enclosure is split into two virtual groups, with up to eight consecutive drives (slots 7-14) controlled by the primary (left) EMM. The remaining drives (slots 0-6) are controlled by the secondary (right) EMM. You must select either mode using the enclosure mode switch on the front panel of the enclosure before powering on (see Figure 1-7). NOTE: Clustering is not supported in the MD1000 host-based RAID solution. Figure 1-6 illustrates the division of control, depending on whether you select the enclosure to run in either unified or split mode. 14 About Your System