Dell PowerVault MD1120 Optimization Manual
Also see for PowerVault MD1 Series: User guide
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Contents
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A REFERENCE GUIDE FOR OPTIMIZING DELL™ POWERVAULT™ MD1XXX FAMILY SAS SOLUTION VER A02PAGE 11 6/16/2008For MD1000 - http://support.dell.com/support/edocs/systems/md1000/For MD1120 - http://support.dell.com/support/edocs/systems/md1120/4. PowerVault MD1xxx Family Storage Enclosure DetailsThe Power Vault MD1xxx Family includes two JBOD enclosures, the MD1000 and the MD1120.These are feature-optimized storage expansion enclosures which utilize the latest industrystandard storage interconnect technology, Serial Attached SCSI (SAS). These enclosures supportbetween 2 and 24 physical SAS drives. This section outlines supported enclosure mode featuresand configuration topologies that apply to both the MD1000 and MD1120 enclosures.Note: MD1000 is supported on both the PERC 5/E and PERC 6/E controllers. MD1120 is onlysupported on the PERC 6/E controller.Enclosure ModesThe enclosures can be set to either unified or split mode through the use of a two-position switchlocated on the front panel of the enclosures. An enclosure can be configured into the selectedmode only at power up. Any changes to the mode switch made while the enclosure is powered onwill not take effect until the enclosure is powered off and back on again.Note: Any time you power on a PowerVault MD1xxx Family storage enclosure, ensure the modeswitch is set in the desired position. If the position of the switch changes inadvertently, data losscould occur as the controller may recognize an inaccurate number of attached physical disksversus the previous mode. In order to cycle power on your MD1xxx Family storage enclosure, allattached servers must be turned off.Unified TopologyIn unified mode, a single server has access to all physical disks in a PowerVault MD1xxx Familystorage enclosure through a single SAS cable. The unified mode can also be used in a daisy-chaining configuration to provide a single server access to up to three enclosures from a singlehost port. The main advantage of unified mode is that it provides a high degree of physical diskscalability.Split TopologyIn split mode, an enclosure is divided into two logical enclosures; with each host connectionaccessing its own set of physical disks. The division between EMM ownership of physical disks isindicated by a disk separation icon in the same area as the physical disk numbering labeling on thefront of the enclosure chassis. See the table below for physical disk ownership for specific MD1xxxFamily enclosures. To connect a server to an enclosure in split mode, the In port of each EMMshould be attached to a connector of a PERC 5/E controller. The Out port of an EMM in split modeis disabled, since enclosure daisy-chaining is not supported in this mode. See Figure 3 for anexample of an enclosure in a split mode configuration. An enclosure in split mode can also haveboth in ports connected to different channels of a single host controller.EMM Physical Disk Ownership in Split Topology |
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