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Hp d2d backup system concepts guide (eh985-90915, march 2011)
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Download this manual See also: Service Maintenance Manual, Configuration Manual
HP StoreOnce
Backup System Concepts Guide
Abstract
If you are new to the HP StoreOnce Backup System, it is a good idea to read this guide before you configure your system. It
describes the StoreOnce technology and advises how to plan the workload being placed on the HP StoreOnce Backup System
in order to optimize performance and minimize the impact of deduplication, replication and housekeeping operations competing
for resources.
IMPORTANT:
on the web at launch may have later updates. Always check
documentation for your product.
HP Part Number: EH985-90915
Published: February 201 1
Edition: 1
The localized versions of this guide have been produced prior to launch. The English version that is available
http://www.hp.com/support/manuals
for the most up-to-date

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  • Page 1 HP StoreOnce Backup System Concepts Guide Abstract If you are new to the HP StoreOnce Backup System, it is a good idea to read this guide before you configure your system. It describes the StoreOnce technology and advises how to plan the workload being placed on the HP StoreOnce Backup System in order to optimize performance and minimize the impact of deduplication, replication and housekeeping operations competing for resources.
  • Page 2 © Copyright 201 1 Hewlett-Packard Development Company, L.P. Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.21 1 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license.

  • Page 3: Table Of Contents

    Contents 1 Before you start..................5 Overview..........................5 NAS targets for backup applications...................5 Virtual Tape Library targets for backup applications..............5 Comparing NAS and Virtual Tape Library targets.................6 Connecting to the HP StoreOnce Backup System................6 For more information.........................6 2 Virtual Tape Devices...................7 Overview..........................7 Emulation types........................7 Creating and configuring virtual tape devices................8 Limitations on the number of devices..................8...
  • Page 4 Cartridge import........................45 Tape spanning .........................46 Replication and Tape Attach....................46 About this guide..................48 Intended audience........................48 Related documentation......................48 Document conventions and symbols..................48 HP technical support.......................49 Customer self repair........................49 Registering your HP D2D Backup System..................49 Subscription service........................49 HP websites...........................50 Documentation feedback......................50 Index......................51 Contents...

  • Page 5: Before You Start

    PCs to target devices on the appliance. These devices are configured as either Network-Attached Storage (NAS) or Virtual Tape Library (VTL) targets for backup applications. The total number of backup targets provided by an HP D2D Backup System is split between VTL and NAS devices and varies according to model.

  • Page 6: Comparing Nas And Virtual Tape Library Targets

    Separate chapters in this guide provide more background information about VTL and NAS devices and the specifications that are supported. For information about using the Web Management Interface to configure and monitor devices, refer to the HP StoreOnce D2D Backup System user guide.

  • Page 7: Virtual Tape Devices

    The HP D2D Backup System supports a wide range of library and drive emulation types. The options available vary according to the HP D2D Backup System model. If the emulation type is not in the dropdown list on the Devices page of the Web Management Interface, it is not supported on your model.

  • Page 8: Creating And Configuring Virtual Tape Devices

    as virtual. Backup application support for Ultrium VT is reasonable, but not quite as complete as the D2DBS library type, so it is not possible to use it with all backup software. NOTE: Symantec prefer their customers to use this emulation type with BackupExec and Netbackup.

  • Page 9: Flexible Emulation (G2 Products Only)

    with more than 63 drives will result in not all devices in the library being seen (which may include the library device). The same limitation could be hit with multiple libraries and fewer drives per library. IMPORTANT: The maximum number of devices per appliance also impacts on the number of NAS shares that you can configure.

  • Page 10: Vtl Devices On An Ethernet Network

    Figure 1 shows a configuration with a single host. The Installation wizard has been run on Host 1. The HP D2D Backup System automatically generates a library for the host. The user may specify the number of slots during installation.

  • Page 11: Backup Applications And Replication Target Libraries

    See the HP StoreOnce D2D Backup System user guide for more information about using this feature. VTL devices on Fibre Channel FC Library devices on the HP D2D cannot be created for a specific host during installation; they must be created using the Web Management interface. When you assign a library to a FC port (port 1 or port 2) it becomes visible on the FC SAN.

  • Page 12: Zoning

    A direct attach topology is implemented by connecting the HP StoreOnce Backup System directly to a Host Bus Adapter (HBA). In this configuration the Fibre Channel private loop protocol must be used. The preferred topology for the HP StoreOnce Backup System is switched fabric using NPIV (N_Port ID Virtualisation).

  • Page 13: Nas Shares

    NFS interface for Linux and UNIX networks NOTE: G1 HP D2D Backup Systems support only the CIFS interface for Windows networks. See the HP StoreOnce Backup System user guide for more information about using the Web Management Interface to create and configure NAS shares as targets for backup applications.

  • Page 14: Maximum Number Of Users Per Cifs Share

    There are also limits on the number of open files greater than the deduplication threshold that are allowed per share and per appliance. These are the files that hold the backed-up data. Backup applications generally create a small number of additional files during a backup job in order to store configuration details and catalog entries.

  • Page 15: Data Deduplication

    4 Data deduplication In this chapter: What is data deduplication? Data deduplication and the HP D2D Backup System Tape rotation example with data deduplication What is data deduplication? Data deduplication is a process that compares blocks of data being written to the backup device with data blocks previously stored on the device.

  • Page 16: Tape Rotation Example With Data Deduplication

    Web Interface. This figure is dynamic, it updates automatically as more data is written to the device. Benefits of HP D2D deduplication The main benefit is that it is possible to store more data and retain data for longer on each device.
  • Page 17 Table 6 Data deduplication savings, example 1 Data stored normally Data stored with deduplication 1st daily full backup 500 GB 500 GB 1st daily incremental backup 50 GB 5 GB 2nd daily incremental backup 50 GB 5 GB 3rd daily incremental backup 50 GB 5 GB 4th daily incremental backup...

  • Page 18: Replication

    Replication and Virtual Tape Devices HP D2D Replication allows cartridges in slots on a library device that has been configured on one HP StoreOnce Backup System (the Source Appliance) to be replicated to corresponding mapped slots on a library device on another HP StoreOnce Backup System (the Target Appliance) at another location.

  • Page 19: Hp Storageworks Replication Manager (Hp D2D4Xxx Series Only)

    Systems. D2D Replication Manager provides basic management capabilities in a replication environment, and provides an easy way to manage up to 300 D2D devices that are being replicated across multiple sites. Using D2D Replication Manager, administrators create, manage, and remove groups of devices;...

  • Page 20: Replication Concepts And Terminology

    Replication concepts and terminology When configuring appliances for replication, there are some key concepts and terminology that it is important to understand. Replication elements Source Appliance: This is the StoreOnce Backup System with the NAS share or library device that is being used for backup by a host server. The NAS share contains data files that need to be replicated;...

  • Page 21: Fan Out

    HP StoreOnce Backup System, see the tables in the Job Concurrency section below. For example: If you have backed up data on the source HP D2D that relates to specific regions, you may want to replicate that data to regional data centers.
  • Page 22 Each HP D2D 250x Series Source Appliance can replicate to up to two Target Appliances. Figure 7 HP D2D 2500 Fan OUT example Of course, the above is for illustration only. If your Company policy does not dictate geographically unique data centers, there’s no reason why you could not support all four libraries or shares on a single Target Appliance, as described in the FAN IN section.
  • Page 23 4 libraries on each Source Appliance. In other words, one Source Share may be mapped into a single HP D2D 4xxx Series Target Share; up to four Source Libraries may be mapped into a single HP D2D 4xxx Series Target Library.
  • Page 24 Source Library. Again, we can map the slot mapping collections from those libraries into a single HP D2D 4xxx series Target Library. Remote Site 5 has four D2D Appliances, each with one Source Library. We can map the slot mapping collections from those libraries into a single HP D2D 4xxx series Target Library.

  • Page 25: Job Concurrency

    There is also a limit on the number of jobs that can run concurrently. See the appropriate entry in the table below. Table 7 Fan In, Fan Out and job concurrency rules, G2 products HP D2D 2502/2504 HP D2D 4106/41 12 HP D2D 4312/4324 Appliance Fan Out Maximum number of...

  • Page 26: Replication Deployment Strategies

    Table 8 Fan In, Fan Out and job concurrency rules, G1 products (continued) Concurrent target jobs Maximum number of D2D2502: 3 concurrent replication D2D2503: 2 jobs into a target D2D2504: 3 appliance Concurrent source Maximum number of D2D2502: 2 jobs concurrent replication D2D2503: 1 jobs from a source...

  • Page 27: Many To One Example

    library on the HP StoreOnce Backup System in Office A. A replication license is required for both HP StoreOnce Backup Systems. Figure 1 1 Active to active replication example Many to One example In the following example a company has two remote offices and a central data center. There are small HP StoreOnce Backup Systems in each remote office which host Replication-Source Libraries and Shares for backup from local host machines.

  • Page 28: Replication Licensing

    To activate your license you must first obtain a permanent License To Use (LTU) from the HP Licensing website and then use the HP D2D’s Web Management Interface to apply the LTU, activate the replication feature and complete the licensing process. The HP Licensing website will ask you for:...

  • Page 29: Seeding The Target Appliance

    StoreOnce Backup System serial number on the form. NOTE: The LTU is tied uniquely to the serial number of your HP D2D hardware. If your hardware serial number changes (by swapping out the unit motherboard), the LTU must be transferred to the new hardware via the HP Licensing website.

  • Page 30: Recovering A Source Appliance

    In the following scenario, a disaster has occurred in the remote site resulting in the loss of both the host servers and the D2D system. Reverse Replication Replication...
  • Page 31 New host server and D2D hardware has been purchased and installed and the administrator now wants to recover data to the D2D and then restore to the host server. Before the failure a mapping existed between a Source Share or Library on the remote site D2D and a Target Share or Library on the Data Center D2D.
  • Page 32 D2D and is going to recover data directly to the server from the Data Center D2D appliance over the WAN (which will take a long time). The target is co-located onto the remote site and connected via iSCSI (LAN), FC or NAS New server hardware has been purchased and installed and the admin now wants to recover data to the server.

  • Page 33: Housekeeping

    What do I need to do? What is housekeeping? If data is deleted from the D2D system (e.g a virtual cartridge is overwritten or erased), any unique chunks will be marked for removal, any non-unique chunks are de-referenced and their reference count decremented.

  • Page 34: For More Information

    See the HP StoreOnce Backup System user guide for details. For more information This is a complex subject. We strongly recommend that you read HP D2D Backup Systems best practices for VTL, NAS and Replication implementations that is available on http:www.hp.com/ support/manuals for more detailed guidance.

  • Page 35: Performance

    HP StoreOnce Backup System. The following is a very brief overview of factors to be considered. We strongly recommend that you read HP D2D Backup Systems best practices for VTL, NAS and Replication implementations that is available on http:www.hp.com/support/...

  • Page 36: To Be Avoided

    Writing 24 streams to 24 separate libraries provides the best performance. Writing 24 streams to 24 drives on a single library provides the best deduplication ratio. To be avoided Do not delete and eject cartridges Avoid housekeeping jobs during backup Avoid running a lot of small incremental backups Performance...

  • Page 37: Glossary

    Glossary Autoloaders An autoloader is a Virtual Tape Device that has a single tape drive and multiple storage slots. (A library has multiple tape drives.) Each storage slot contains a cartridge that can be allocated to a specific backup task; for example, one cartridge can hold Monday's data, another can hold Tuesday's data, and so on.
  • Page 38 transfer backup data from the host to the HP StoreOnce Backup System. Access to the HP StoreOnce Web Management Interface is always across an Ethernet connection. Flexible emulation Flexible emulation does not set hard limits on the number of VTL devices (loader and drives) and NAS shares that may be configured for a particular data store, although there are restrictions on the maximum numbers that may be configured for an appliance.
  • Page 39 It is important to understand that the HP StoreOnce network share is intended to be used ONLY by backup applications that “back up to disk”. Do not use the device as a drag-and-drop general file store. Network File System (NFS) is a protocol for interfacing to hosts on a Linux or UNIX network. G2 HP StoreOnce Backup Systems support this interface for connecting to NAS targets on the HP StoreOnce G2 appliance from a Linux or UNIX network host.
  • Page 40 The main difference between copy and export is that copied data remains on the G1 HP D2D Backup System; exported data is removed from it, but can be imported easily when required. These functions are grouped under the Tape Attach section of the Web Interface.

  • Page 41: A Tape Attach Information For G1 Products

    A Tape Attach information for G1 products An external or rackmount Ultrium library or tape device may be attached directly to G1 HP D2D Backup Systems, allowing the user to store backups offsite. Always refer to http://www.hp.com/ go/connect http://www.hp.com/go/ebs to find out which tape library and tape drive models are supported.

  • Page 42: Archiving Methods

    Figure 16 Cartridge copy Why use the Copy functionality? Copy creates two instances of the same cartridge; one stored on the HP D2D, the other on physical tape. Logically these are the same cartridge and the backup application has no awareness that there are two copies.

  • Page 43: Cartridge Export

    The backup application on the host is used to back up data to a slot on the library device (or to a standalone tape drive device) in the HP D2D Backup System. It is also used to move the data from the slot into the mail slot.
  • Page 44 Why use the Export functionality? The main reason for using Export is to create more space on the HP D2D Backup System. If space is not an issue, Copy is the recommended method for creating offsite backups, because it is controlled solely from the Web Management Interface and will not impact any tape rotation strategy.

  • Page 45: Compression

    Compression When you are moving data from the HP D2D to physical tape, it is important to be aware that the cartridge maximum size is the native size (without compression). HP StorageWorks tape drives apply hardware compression, therefore, the data from the HP D2D Backup System is likely to require less space on a physical tape cartridge.

  • Page 46: Tape Spanning

    Data from only one cartridge on the HP D2D Backup System can be copied or exported at a time; it is not possible to select multiple slots and copy them to a single physical cartridge.
  • Page 47 D2D device in the remote office. This procedure only applies if a tape library or tape drive is physically attached to the Data Center D2D appliance.

  • Page 48: About This Guide

    Using the HP StoreOnce D2D Backup System Troubleshooting the HP StoreOnce D2D Backup System Intended audience This guide is intended for users who install, operate and maintain the HP StoreOnce D2D Backup System. Related documentation In addition to this guide, the following document provides related information: ‘Start here' poster for an overview of the installation information in this guide (available in English,...

  • Page 49: Hp Technical Support

    Registering your HP D2D Backup System Once you have installed and tested your HP D2D Backup System please take a few minutes to register your product. You can register via the web (http://www.register.hp.com). To ensure your registration is complete, there are a number of questions on the electronic form that are mandatory.

  • Page 50: Hp Websites

    HP websites For additional information, see the following HP websites: http://www.hp.com http://www.hp.com/go/ebs http://www.hp.com/go/connect http://www.hp.com/go/storage http://www.hp.com/service_locator http://www.hp.com/support/manuals http://www.hp.com/support/downloads Documentation feedback HP welcomes your feedback. To make comments and suggestions about product documentation, please send a message to storagedocs.feedback@hp.com. All submissions become the property of HP.

  • Page 51: Index

    Index archive glossary, from D2D Backup System, audience, help obtaining, backup targets, host definition, 7, fibre channel, capacity license, housekeeping, cartridge copy, technical support, export, import, 43, HP 1x8 G2 Autoloader, CIFS, CIFS share maximum users, import cartridge, 43, comparing NAS and VTL,...
  • Page 52 don'ts, optimizing, visible target libraries, performance vs dedupe ratio, permissions comparing with NAS, source appliance, creating and configuring devices, limitations on numbers of, replication, recovery VTL configuration replication, with many hosts, related documentation, with one host, replication VTL targets, active to active, active to passive, and firewalls, 19, websites...

This manual is also suitable for:

Storeonce d2d4100 seriesStoreonce d2d4300 seriesStoreonce d2d2500 series

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