Dell H700 Computer Accessories User Manual


 
Dell
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 scalabilityup 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.