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DELL PERC H700 and H800 Technical Guide 9
2 New Features
2.1 Overview
The PERC H700 and PERC H800 offer the new CacheCade feature:
• Produces cost-effective performance scaling for database-type applications
• Offloads Random Reads to Dell-qualified Enterprise SSD configured as CacheCade SSD
• Has a standard feature of 1 GB NV cache (PERC H700/H800)
The PERC H700 and PERC H800 continue to offer the following features:
• 512 MB and 1 GB non-volatile cache (not supported on H700 modular)
o Data retention in cache is extended from hours to years in the event of power
interruption
o Larger cache size of 1 GB
• Cut-through IO (CTIO)
o Performance boost of up to 2X IOPS performance
o Optimized for superior IOPS of SSDs over HDDs
o Ideal for small-block random workloads
o Easy to enable
• Physical disk power management
o Conserve power by spinning down hot spares and unconfigured drives when not in use
o Parameters are user-managed
• PCI-Express Gen2.0 support
• 6Gb/s SAS (SAS 2.0) host interface
o Doubles the throughput performance
o Support for Self Encrypting Drive (SED)—requires unique SED HDD part numbers
• New LSI 2108 ROC (Raid-on-Chip) with increased I/O processor (IOP) performance
• Increased internal drive support (up to 16 drives)
• SAS SSD support for specific 11
th
Generation Dell PowerEdge servers
• RAID volumes can be migrated from PERC 6/I, PERC 6/E, SAS 6/IR and PERC H200 controllers.
Backwards migration is not supported.
• Change in Virtual Disk default read cache policy (The default VD read cache policy has been
changed to Adaptive Read Ahead from No Read Ahead.)
• Display of expected and negotiated link rate for drives
The PERC H800 also offers the following features for PowerVault MD1200 and MD1220 enclosures:
• Increased capacity and scalability—up to 192 drives on one host-RAID controller
• Increased flexibility
o Mix of 2.5” (MD1220) and 3.5” (MD1200) enclosures behind a PERC H800
o Mix of 2.5” and 3.5” drives in the MD1200
• SAS SSD support for Dell PowerVault MD1200 and MD1220 enclosures
• 22-drive RAID-10 can be configured with PERC H800 in the CTRL-R BIOS utility
2.2 6Gb/s SAS (SAS 2.0) Overview
The 6Gb/s SAS 2.0 specification doubles the current 3Gb/s SAS data transfer rate. 6Gb/s SAS is
designed for backward compatibility with 3Gb/s SAS and 3Gb/s SATA hard drives. Regardless of the
drive speed, 6Gb/s controllers will deliver significant performance improvements in both read and
write applications as compared to their 3Gb/s predecessors.