Dell PowerVault MD3200i Series Technical Manualbook

Also see for PowerVault MD3200i Series: Manual Update Rack Installation Instructions User guide Support Matrix

Contents

Dell PowerVault MD3200i Series Technical Manualbook Manual pdf 31 page image

DELL PowerVault MD3200i/MD3220i Technical Guide Book29Table 5. Supported RAID ConfigurationsRAID-0 RAID-1 and 1+0 RAID-5 RAID-6DescriptionData is stripedacross multiplephysical disks.Data is “mirrored”to another physicaldisk.Physical disks operatedindependently with dataand parity blocksdistributed across allphysical disks in the group.Physical disks operatedindependently with dataand dual parity blocks aredistributed across allphysical disks in the group.Min # of physicaldisks in a diskgroup1 2 3 4Max # of physicaldisks in a diskgroup96 96 30 30Usable capacity as% of raw capacity 100% 50% 66.67% to 96.67% 50% to 93.33%Application IOPS | MB/s IOPS IOPS | MB/s IOPS | MB/sAdvantagesPerformance due toparalleloperation of theaccessPerformance asmultiple requestscan be fulfilledsimultaneouslyGood for reads, small IOPS,many concurrent IOPS andrandom I/Os. Parityutilizes small portion ofraw capacity.Same advantages as RAID-5but with better dataprotection. Two harddrives can fail withoutlosing access to data.DisadvantagesNo redundancy.One physical diskfails, data is lostStorage costs aredoubledWrites are particularlydemandingOverhead on writes will beslightly more demandingthan RAID-5Virtual Disk ConfigurationA virtual disk is a logical structure on astorage array for data storage. A virtualdisk is created by slicing a disk group intoa stripe set with a defined capacity. Eachdisk group supports up to one or morevirtual disks and a maximum of 256 virtualdisks per MD3200i series of storagesystem. During the virtual disk creationprocess, the user specifies the capacity ofthe virtual disk and the virtual disk name.Additional settings include preferredcontroller ownership and a virtual disk-to-LUN mapping parameter (See Storage Partitioning section).Configuration MetadataMD3200i series of controllers store configuration metadata in a private 512 MB region on everyconfigured physical disk. This metadata area contains physical disk state and status information,virtual disk state and status information and controller and subsystem information. The metadata onDisk1Disk2Disk3Disk4Disk Group AVirtual DiskMarketing