Dell H700, H800 manual New Features, 6Gb/s SAS SAS 2.0 Overview

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2 New Features

2.1Overview

The PERC H700 and PERC H800 offer the new CacheCade feature:

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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)

oData retention in cache is extended from hours to years in the event of power

interruption

oLarger cache size of 1 GB

•Cut-through IO (CTIO)

oPerformance boost of up to 2X IOPS performance

oOptimized for superior IOPS of SSDs over HDDs

oIdeal for small-block random workloads

oEasy to enable

•Physical disk power management

oConserve power by spinning down hot spares and unconfigured drives when not in use

oParameters are user-managed

•PCI-Express Gen2.0 support

•6Gb/s SAS (SAS 2.0) host interface

oDoubles the throughput performance

oSupport 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 11th 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

oMix 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

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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

2.26Gb/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.

DELL PERC H700 and H800 Technical Guide 9