I have got a chance to configure Dell MD 1000 DAS ( Direct Attach Storage) Array recently. Would like to point out few of the features and other stuffs here about this wonderful product.
This storage is usefull if you want more storage space and you dont have enough budget to roll out a iSCSI or FCP storage infrastrucutre.
– Contains 15 drives ( SAS or SATA) can be able to expand up to 45 disks ( The enclosure can be daisy-chained with up to two additional enclosures)
– There are two modes in this storage , below are the short description
In unified mode, a SAS host ( Server) 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. That means we can assign one group in to one host and another in to second host. Splitting the storage space.
You must select either mode using the enclosure mode switch on the front panel of the enclosure before powering on. If you are setting mode after power on need to reboot the enclosure again.
– There are two ports on the rear side of enclosure. These ports are using either to connect to host ( server) or to expand the enclosure.
In Port : Provide SAS connection for cabling to host ( server) or next upchain expansion enclosure (unified mode only).
Out Port : Provide SAS connection for cabling to the next downchain expansion enclosure in a daisy chain
(unified mode only).
– Enclosure Alarm : An audible alarm will be activate if any of the following component fail. It will sounds continusoly. If an any non critical errors then the alarm sounds every 10 seconds.
a) Two or more fan blowers have failed or a power supply/cooling fan module is not installed.
b) One or more temperature sensors are in critical range.