Dell POWEREDGE RADI H700 Technical Manual

Also see for PERC H700: User guide Installation and Removal Instructions

Dell POWEREDGE RADI H700 Technical Manual Manual pdf 15 page image

DellDELL PERC H700 and H800 Technical Guide 15Feature PERC H700Integrated/AdapterPERC H700 Modular PERC H800 AdapterClustering Card and softwarestack enables HighAvailability ClustersNot supported4.2 CacheCadeCacheCade provides cost-effective performance scaling for database-type application profiles in ahost-based RAID environment by extending the PERC RAID controller cache with the addition of Dell-qualified Enterprise SSDs.CacheCade identifies frequently-accessed areas within a data set and copies this data to a Dell-qualified, Enterprise SSD (SATA or SAS), enabling faster response time by directing popular RandomRead queries to the CacheCade SSD instead of to the underlying HDD.Supporting up to 512 GB of extended cache, CacheCade SSDs must all be the same interface (SATA orSAS) and will be contained in the server or storage enclosure where the RAID array resides.CacheCade SSDs will not be a part of the RAID array.CacheCade is a standard feature on, and only available with, the PERC H700/H800 1 GB NV CacheRAID controller.CacheCade SSDs can be configured using the PERC BIOS Configuration Utility or OpenManage.4.3 Cut-Through IOCut-through IO (CTIO) is an IO accelerator for SSD arrays that boosts the throughput of devicesconnected to the PERC Controller. It is enabled through disabling the write-back cache (enablewrite-through cache) and disabling Read Ahead.4.4 Reconfiguring Virtual DisksThere are two methods to reconfigure RAID virtual disks—RAID Level Migration (RLM) and OnlineCapacity Expansion (OCE). RLM involves the conversion of a virtual disk to a different RAID level. OCErefers to increasing the capacity of a virtual disk, which can be accomplished in three ways: If there is a single virtual disk in a disk group and free space is available, the virtual disk’scapacity can be expanded within that free space. If a virtual disk is created and it does not usethe maximum size of the disk group, free space is available. Free space is also available when a disk group’s physical disks are replaced by larger disks usingthe Replace Member feature. A virtual disk's capacity can also be expanded by performing an OCE operation to add morephysical disks by encompassing all available free space on a given virtual disk, adding drivesand/or migrating to a different RAID level.When a RLM/OCE operation is complete, a reboot is not necessary. For a list of RAID level migrationsand capacity expansion possibilities, see Table 1. The source RAID level column indicates the virtualdisk level before the RAID level migration and the target RAID level column indicates the RAID levelafter the operation is complete. If you configure 64 virtual disks on a controller, you cannot performa RAID level migration or capacity expansion on any of the virtual disks. The controller changes thewrite cache policy of all virtual disks undergoing a RLM/OCE to Write-Through until the RLM/OCE iscomplete.Note: RAID level migration and expansion is not supported on RAID levels 10, 50, and 60.