Dell PowerEdge RAID Controller Cards H700 and H800 Technical Guide Enterprise-class controllers designed for performance, reliability, and fault tolerance.
Dell This document is for informational purposes only. Dell reserves the right to make changes without further notice to any products herein. The content provided is as is and without express or implied warranties of any kind. Dell, PowerEdge, PowerVault, and OpenManage are trademarks of Dell, Inc. Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Red Hat is a registered trademark of Red Hat, Inc.
Dell Table of Contents 1 Product Comparison ........................................................................................... 5 1.1 Overview .................................................................................................. 5 1.2 PERC H700 Model Overview............................................................................. 6 1.3 PERC H800 Model Overview ............................................................................. 7 2 New Features ..........................
Dell 5.3.5 RAID 10 (Striping over Mirrored Sets) ......................................................... 25 5.3.6 RAID 50 (Striping Across RAID 5) ............................................................... 26 5.3.7 RAID 60 (Striping Across RAID 6) ............................................................... 27 Appendix A. Additional Resources.......................................................................... 29 Tables Table Table Table Table Table Table Table Table Table 1. 2. 3.
Dell 1 Product Comparison 1.1 Overview The PERC H700 (internal) and PERC H800 (external) RAID controllers mark the next stage in the evolution of the Dell™ PowerEdge™ RAID controller portfolio with the introduction of 6Gb/s SAS (SAS 2.0). PERC H700 and H800 will be supported in PowerEdge 11th Generation servers. The PERC H700 is follow-on to the PERC 6/I, and the PERC H800 is the follow-on to the PERC 6/E. Table 1.
Dell 1.2 PERC H700 Overview The PERC H700 internal host-RAID product offers three different models to support 11th Generation Dell PowerEdge servers: The PERC H700 Integrated card with two x4 internal mini-SAS ports supports the PCIe 2.0 x8 host interface. Cache options include standard 512 MB with battery backup unit (BBU), 512 MB non-volatile (NV) cache, or 1 GB non-volatile cache. The PERC H700 Integrated card is installed in the dedicated internal storage slot of the server.
Dell Figure 2. PERC H700 Modular 1.3 PERC H800 Overview The PERC H800 external host-RAID product is supported with 11th Generation Dell PowerEdge servers for expanding storage to the Dell™ PowerVault™ MD1200 and MD1220 6Gb/s SAS enclosures. The PERC H800 Adapter with two x4 external mini-SAS ports supports the PCIe 2.0 x8 host interface. Cache options include the standard 512 MB transportable battery backup unit (TBBU) and the transportable 512 MB and 1 GB non-volatile cache.
Dell Figure 3.
Dell 2 New Features 2.
Dell Other new features of the 6Gb/s SAS controllers will offer improved signal integrity and additional safeguards to enhance data protection with support for SED (Self-Encrypting Drive) technology. Table 2. 6Gb/s SAS (SAS 2.0) Features DAS-based Server Storage 2.2.
Dell 3 Product Support 3.1 Dell PowerEdge Server Support The Dell PERC H700 and PERC H800 are supported with 11th Generation Dell™ PowerEdge™ servers. Refer to Table 1 for the 11th Generation PowerEdge servers that support the PERC H700 and PERC H800. For the latest Dell PERC support matrix with Dell PowerEdge servers, visit the PERC web page at www.dell.com/PERC. Table 4.
Dell Table 5. Operating System Support with PERC H700 and PERC H800 Supported Operating Systems Microsoft® Windows Server® 2003 Family Microsoft Windows Server 2008 Family Microsoft Windows Server 2008 R2 Red Hat® Enterprise Linux® Version 4 and Version 5 RHEL 4.7 and later (32 and 64 bit) RHEL 5.3 and later (32 and 64 bit) Sun® Solaris™ 10 (64-bit) Novell® SUSE® Linux® Enterprise Server Version 10 (64-bit) and Version 11 (64-bit) SLES10 SP2 and later SLES11 GM and later VMware® vSphere™ 4.
Dell 4 Product Overview 4.1 PERC H700 and PERC H800 Overview Table 7.
Dell Feature PERC H700 Integrated/Adapter PERC H700 Modular PERC H800 Adapter Physical Disk Power Management Yes Yes Yes RAID Level Migration Yes Yes Yes On-line Capacity Expansion Yes Yes Yes Non-Volatile Cache Yes No Yes SMART Support Yes Yes Yes Redundant Path Support N/A N/A Yes Dedicated and Global Hot Spares Yes Yes Yes Revertible Hot Spares Yes Yes Yes Hot Swap Devices Yes Yes Yes Disk Roaming Yes Yes Yes Disk Migration Yes Yes Yes SED Support Yes Yes
Dell Feature PERC H700 Integrated/Adapter Clustering Card and software stack enables High Availability Clusters PERC H700 Modular PERC H800 Adapter Not supported 4.2 CacheCade CacheCade provides cost-effective performance scaling for database-type application profiles in a host-based RAID environment by extending the PERC RAID controller cache with the addition of Dellqualified Enterprise SSDs.
Dell Table 8. RAID Level Migration Source RAID Level Target RAID Level # of Physical Drives (Beginning) # of Physical Drives (End) Capacity Expansion Possible Description RAID 0 RAID 1 1 2 No Converting nonredundant virtual disk into a mirrored virtual disk by adding one drive. RAID 0 RAID 5 1 or more 3 or more Yes At least one drive needs to be added for distributed parity data. 4 or more Yes At least two drives need to be added for dual distributed parity data.
Dell 4.5.1 Physical disk rebuild using hot spares Enclosure affinity Parity generation and checking (for RAID 5, 50, 6, and 60 only) Battery backup of controller cache to protect data Detection of batteries with low charge after boot up Non-Volatile Cache Dell PERC controllers with non-volatile (NV) cache use the standard battery as contained in the Dell PERC controllers with a battery back-up unit (BBU). The difference is in battery implementation: 4.5.
Dell being a ready hot spare. This allows hot spares to remain in specific enclosure slots. While the controller is reverting the hot spare, the virtual disk remains optimal. The controller automatically reverts a hot spare only if the failed drive is replaced with a new drive in the same slot. If the new drive is not placed in the same slot, a manual Replace Member operation can be used to revert a previously commissioned hot spare. 4.5.
Dell 4.7 Disk Roaming The PERC H700 and H800 cards support moving physical disks from one cable connection or backplane slot to another on the same controller. The controller automatically recognizes the relocated physical disks and logically places them in the proper virtual disks that are part of the disk group. Disk roaming can be performed only when the system is turned off. Disk roaming should not be performed during RAID level migration (RLM) or online capacity expansion (OCE).
Dell 4.10 Virtual Disk Write Cache Policies The write cache policy of a virtual disk determines how the controller handles writes to that virtual disk. Write-Back and Write-Through are the two write cache policies and can be set on virtual disks individually. All RAID volumes will be presented as Write-Through (WT) to the operating system (Windows and Linux) independent of the actual write cache policy of the virtual disk.
Dell 5 RAID Overview 5.1 About RAID RAID is a way of storing data on multiple independent physical disks for the purpose of enhanced performance and/or fault tolerance. The physical disks combine to make up what is called a virtual disk. This virtual disk appears to the host system as a single logical unit or drive. For example, if you have physical disk 1 and physical disk 2 forming a RAID virtual disk, those two disks appear to the host system as one disk.
Dell For example, a four-drive virtual disk may be configured with 16 stripes (four stripes of designated space per drive). Stripes A, B, C and D are located on corresponding hard drives 0, 1, 2, and 3. Stripe E, however, appears on a segment of drive 0 in a different location than stripe A; stripes F through H appear accordingly on drives 1, 2 and 3. The remaining eight stripes are allocated in the same even fashion across the drives.
Dell Data 1 Data 2 = Data 3 Data 4 Drive 0 Figure 5.
Dell Parity Data 1 Data 2 Data 3 Data 4 0 parity Generation Data 5 Data 6 Data 7 1 parity Data 8 Data 9 Data 10 2 parity Data 11 Data 12 Data 13 3 parity Data 14 Data 15 Data 16 Data 17 Data 18 Data 19 Data 20 Drive 3 Drive 4 Drive 5 4 parity Drive 1 Figure 6.
Dell Parity Data 1 Data 2 Data 3 P parity Q parity Generation Data 5 Data 6 P parity Q parity Data 8 Data 9 P parity Q parity Data 11 Data 12 P parity Q parity Data 14 Data 15 Data 16 Q parity Data 17 Data 18 Data 19 P parity Drive 3 Drive 4 Drive 5 Drive 1 Figure 7.
Dell RAID 0 RAID 1 RAID 1 Data 1 Data 3 Data 5 = Data 7 Drive 0 Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Data 8 Drive 1 Figure 8. Data 2 = Drive 2 Data 4 Data 6 Data 8 Drive 3 Example of RAID 10 (1 + 0) Advantages of RAID 10 RAID 10 has the same redundancy as RAID level 1 High I/O rates are achieved by striping RAID 1 segments Allows creation of largest RAID group with up to 192 drives connected to PERC H800 Disadvantages of RAID 10 5.3.
Dell RAID 0 RAID 5 RAID 5 Parity Generation 0 parity Data 1 Data 2 Data 5 1 parity Data 6 2 parity Data9 Data 10 Drive 1 Drive 2 Figure 9.
Dell RAID 0 RAID 6 RAID 6 Parity Generation Data 1 Data 2 P parity Q parity Data 3 Data 4 P parity Q parity Data 5 P parity Q parity Data 6 Data 7 P parity Q parity Data 8 P parity Q parity P parity Q parity Data 11 Data 12 Q parity Data 9 Data 14 Data 10 Data 13 P parity Q parity Data 15 Data 16 P parity Drive 3 Drive 4 Drive 5 Drive 6 Drive 7 Drive 8 Drive 1 Drive 2 Parity Generation Figure 10.
Dell Appendix A. Additional Resources Table 9. Resource Contact Information and Descriptions Type Of Information URL Description PERC Resources http://www.dell.com/PERC Support matrix, whitepapers, and important links PERC Hardware Owner’s Manual http://support.dell.com/manuals Specifications, feature overview and descriptions, installation, management, and troubleshooting OpenManage User Documentation http://www.support.dell.
