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Dell POWEREDGE RADI H700 Technical Manual

Raid controller cards
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Dell PowerEdge RAID
Controller Cards
H700 and H800
Technical Guide
Enterprise-class
controllers
designed for
performance,
reliability, and
fault tolerance.

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  Summary of Contents for Dell POWEREDGE RADI H700

  • Page 1 Dell PowerEdge RAID Controller Cards H700 and H800 Technical Guide Enterprise-class controllers designed for performance, reliability, and fault tolerance.
  • Page 2 Dell disclaims proprietary interest in the marks and names of others. ©Copyright 2009–2011 Dell Inc. All rights reserved. Reproduction or translation of any part of this work beyond that permitted by U.S. copyright laws without the written permission of Dell Inc. is unlawful and strictly forbidden.
  • Page 3: Table Of Contents

    RAID 0 (Striped Virtual Disk without Fault Tolerance) ... 21 5.3.2 RAID 1 (Mirroring) ... 22 5.3.3 RAID 5 (Striping With Distributed Parity) ... 23 5.3.4 RAID 6 (Striping With Dual Distributed Parity) ... 24 DELL PERC H700 and H800 Technical Guide Table of Contents...
  • Page 4 Example of RAID 10 (1 + 0) ... 26 Figure 9. Example of RAID 50 (5 + 0) ... 27 Figure 10. Example of RAID 60 (6 + 0) ... 28 DELL PERC H700 and H800 Technical Guide Tables Figures...
  • Page 5: Product Comparison

    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 11 follow-on to the PERC 6/I, and the PERC H800 is the follow-on to the PERC 6/E.
  • Page 6: Perc H700 Model Overview

    The PERC H700 Modular card is installed in the integrated slot in the blade server platforms. See Figure 2 for a view of the PERC H700 Modular card. PERC H700 Integrated (Additional Sled for PCIe Slot) Figure 1. DELL PERC H700 and H800 Technical Guide Generation...
  • Page 7: Perc H800 Model Overview

    The PERC H800 external host-RAID product is supported with 11 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.
  • Page 8: Figure 3. Perc H800 Adapter

    Dell PERC H800 Adapter Figure 3. DELL PERC H700 and H800 Technical Guide...
  • Page 9: New Features

    • 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: •...
  • Page 10: 6Gb/S Sas Performance Benefit Over 3Gb/S Sas

    This means more users, more video streams, more email accounts, and faster backups are now possible. DELL PERC H700 and H800 Technical Guide 6Gb/s SAS (SAS 2.0) Features unidirectional.
  • Page 11: Product Support

    Dell PowerEdge Server Support The Dell PERC H700 and PERC H800 are supported with 11 Refer to Table 1 for the 11 H800. For the latest Dell PERC support matrix with Dell PowerEdge servers, visit the PERC web page at www.dell.com/PERC. Table 4.
  • Page 12: Drive Support

    The Dell PERC H700 supports SAS and SATA interface drives, both HDD (hard-disk drive) and SSD (solid-state drive). The Dell PERC H800 supports SAS interface drives, both HDD and SSD. Refer to the following table for drive support details. For specific form-factor and capacity support, see the Technical Guidebook for your server at http://www.dell.com.
  • Page 13: Product Overview

    Up to 64 Disks (RAID volumes) per controller PCI-Express 2.0 Support Cut-through IO DELL PERC H700 and H800 Technical Guide PERC H700 and PERC H800 Features PERC H700 Modular 0, 1, 5, 6, 10 1 x4 integrated SAS wide port...
  • Page 14 Enclosure Hot-Add SAS port LEDs used to determine connection LED the status of the SAS port DELL PERC H700 and H800 Technical Guide PERC H700 Modular PERC H800 Adapter Up to 4 per port (total of 8 enclosures per Adapter) Supported.
  • Page 15: Cachecade

    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 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 Random Read queries to the CacheCade SSD instead of to the underlying HDD.
  • Page 16: Fault-Tolerance Features

    Non-volatile cache: extends data retention from hours to years  Support for SMART  Redundant path support (for PERC H800 only)  Physical disk failure detection DELL PERC H700 and H800 Technical Guide Table 8. RAID Level Migration # of Physical # of Physical Drives Drives (End)
  • Page 17: Non-Volatile Cache

    Detection of batteries with low charge after boot up 4.5.1 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: ...
  • Page 18: Enclosure Affinity

    SAS HDD can replace a SAS HDD; only a SATA SSD can replace a SATA SSD. • The replacement drive must be of equal or greater capacity than the one it is replacing. DELL PERC H700 and H800 Technical Guide...
  • Page 19: Disk Roaming

    4.9.1 PERC H700 and H800 Security Key Implementation The Dell PowerEdge RAID Controller (PERC) H700 and H800 cards support encryption of data on the drives when using Dell qualified self-encrypting drives (SEDs). This feature provides protection to the data at rest in the event of theft or loss of drives. There is one security key per controller which resides in the controller memory and it can be managed by the user (local key management).
  • Page 20: Virtual Disk Write Cache Policies

    If the read requests are random, the controller reverts to No Read Ahead mode. Note: The default read cache setting for virtual disks is Adaptive Read Ahead. DELL PERC H700 and H800 Technical Guide...
  • Page 21: Raid Overview

    50, and 60 also allow the host to access disks simultaneously. Supported RAID Levels Dell servers that use RAID controllers may support RAID 0, 1, 5, 6, 10, 50, and 60 depending upon the controller. The following is a brief explanation of these levels.
  • Page 22: Raid 1 (Mirroring)

    (mirrored set) in the virtual disk. See Figure 5. In other words, if a disk fails, the mirrored drive takes over and functions as the primary drive. DELL PERC H700 and H800 Technical Guide Data 2 Data 3...
  • Page 23: Raid 5 (Striping With Distributed Parity)

    Figure 6 shows how the parity data is distributed among five hard drives. A RAID 5 virtual disk can preserve data if one drive fails. However, if two drives fail, the virtual disk will fail. DELL PERC H700 and H800 Technical Guide Data 1 Data 1 Data 2...
  • Page 24: Raid 6 (Striping With Dual Distributed Parity)

    Due to dual data protection, a RAID 6 VD can survive the loss of two drives or the loss of a drive when one of its drives is being rebuilt. DELL PERC H700 and H800 Technical Guide Data 3 Data 2...
  • Page 25: Raid 10 (Striping Over Mirrored Sets)

    This is an excellent solution for sites that require the highest level of performance and redundancy, as well as the fastest recovery of data after a drive failure. DELL PERC H700 and H800 Technical Guide Data 3...
  • Page 26: Raid 50 (Striping Across Raid 5)

    6 disks each time, where the parity calculation on the RAID 50 may require only reading 3. This may vary depending on several factors such as cache and data block sizes. DELL PERC H700 and H800 Technical Guide RAID 0...
  • Page 27: Raid 60 (Striping Across Raid 6)

    6 disks each time, where the parity calculation on the RAID 60 may require only reading 4. This may vary depending on several factors such as cache and data block sizes. DELL PERC H700 and H800 Technical Guide RAID 0...
  • Page 28: Figure 10. Example Of Raid 60 (6 + 0)

    Less space-efficient than RAID 6 since separate parity calculations are done for each RAID 6 subset  Retrieval of parity information after a drive failure takes longer than using a mirrored solution DELL PERC H700 and H800 Technical Guide RAID 0 Q parity P parity...
  • Page 29: Appendix A. Additional Resources

    Table 9. Type Of Information PERC Resources PERC Hardware Owner’s Manual OpenManage User Documentation Break/Fix First contact for product issues. DELL PERC H700 and H800 Technical Guide Resource Contact Information and Descriptions http://www.dell.com/PERC http://support.dell.com/manuals http://www.support.dell.com/ manuals www.support.dell.com (Customer tab) Description...

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