ATTO Technology 5300 Appendix B Designing RAID groups, Jbod Just a Bunch of Disks, RAID Level

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Appendix B Designing RAID groups

The ATTO FastStream VT 5300 provides instant hardware data protection and intelligence to existing SCSI storage independent of the storage type.

CAUTION

Selecting RAID configuration causes all previous storage data on the drive to be erased. Make sure all of your information is backed up before setting up RAID groups.

The ATTO FastStream VT 5300 allows RAID functionality. In general, the process begins with individual drives also called block devices.

Note

If a drive has corrupt or outdated configuration data, that drive cannot be assigned to any RAID Group. Ensure all drives to be assigned to RAID groups are configured properly. Refer to Initialize and verify drives on page 17.

A RAID Group is a virtual, independent single drive whose data is written to physical drives according to a RAID algorithm. The ATTO FastStream VT 5300 supports JBOD, RAID Level 0, RAID Level 1, RAID Level 10 and RAID Level 5.

JBOD (Just a Bunch of Disks)

JBOD (Just a Bunch of Disks) configuration allows many individual drives to be available for normal storage operations with no special data protection.

Using the ATTO FastStream VT 5300 allows you to concatenate several individual drives into one large drive.

A JBOD drive can be constructed as a special case of a RAID Group. When multiple physical drives are assigned to a JBOD RAID Group, their storage areas appear as a single spanned area of storage. The ATTO FastStream VT 5300 supports 1 to 32 drives per JBOD-configured RAID Group.

Exhibit A-2 JBOD: Just a Bunch of Disks: no redundancy; each disk is treated independently

JBOD

Disk 0

Disk 1

Disk 2

D0

D4

D8

 

 

 

D1

D5

D9

 

 

 

D2

D6

D10

 

 

 

D3

D7

D11

 

 

 

RAID Level 0

RAID Level 0 (striping) is based on the fact that increased performance can be achieved by simultaneously accessing data across multiple drives, increasing data transfer rates while reducing average access time by overlapping drive seeks. RAID Level 0 groups provide data that is striped across several drives. Drives are accessed alternately, as if stacked one on top of the other.

RAID Level 0 provides no data protection. If one drive fails, all data within that stripe set is lost.

The ATTO FastStream VT 5300 supports 2 to 32 drives per RAID Level 0 group.

RAID Level 0 is used by applications requiring high performance for non-critical data.

Exhibit A-3 Exhibit 1.0-2 RAID Level 0, no redundancy

RAID Level 0

Stripe

Disk 0

Disk 1

Disk 2

Disk 3

Disk 4

Disk 5

 

 

 

 

 

 

 

0

D0

D1

D2

D3

D4

D5

 

 

 

 

 

 

 

1

D6

D7

D8

D9

D10

D11

 

 

 

 

 

 

 

2

D12

D13

D14

D15

D16

D17

 

 

 

 

 

 

 

3

D18

D19

D20

D21

D22

D23

 

 

 

 

 

 

 

RAID Level 1

RAID Level 1 ensures the security of data by writing the exact same data simultaneously to two or more different drives. This application is for

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ATTO Technology Inc. FastStream VT 5300 Installation and Operation Manual

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Contents FastStream VT Page Page Contents Update storage and firmware Appendix E Warranty, contact information XxiModify storage Interface optionsHardware features Virtual Tape featuresBackup and restore features Management and control featuresGbE network Gb FC Switch GbE SwitchEthernet Fibre Channel Physical attributes Installation Installation Unpack the packing box verify contentsInstall the FastStream Install Windows driversBegin initial configuration Click on Launch BrowserConfigure Virtual Tape Use quick initial configuration Use custom initial setupUse Hot Spare devices Click on the Add/Remove Hot Spares buttonClick in the Enable/Disable Write Protection button Enable/Disable Write Protection page appearsSecure data through Write Protection Move Virtual Tape CartridgesOptional changes to system parameters Customize the username, passwordChange system configurations Changes to other parameters may be made using the Advanced Advanced CLIMonitor storage and diagnose configurations Monitor VTLPhone home E-mail messages Configuration DisplayHealth and Status Monitor Measure drive performance Click the Set up Error Notification buttonConfiguration Scan drive surfaces Verify storageClick the Initialize and Verify button Select Verify OnlyAdd drives to a RAID Group Modify storageInitialize and verify drives Rebuild RAID Groups Add or remove Hot SparesSelect Rebuild RAID Groups Select the Add/Remove Hot Spares buttonClick in the Delete Virtual Tape Library button Add a VTL from another FastStream VTLDelete a VTL Move Virtual Tape Cartridges Update storage and firmware Remove stale VTL configuration dataUpdate firmware Preliminary stepsUse FTP over Ethernet Use the RS-232 serial linkSend File Click Send FileType FastStream VT 5300 in the New Connection dialog box Interface optionsUse the serial port Use Telnet EnterCable types Appendix a CablingScsi cabling Fibre Channel connections Cable lengthAppendix B Designing RAID groups Jbod Just a Bunch of DisksRAID Level DiskIv Appendix Symbol Indicates Appendix C CLI provides an ASCII-based interfaceCLI error messages Mp1Command Default Example CLI summaryViii Appendix Sntp CLI command explanations DefaultInterleave DHCPFixedDelayDriveTestConfig DumpConfigEmailPassword EmailNotifyAddressEmailServerAddress EmailUsernameFCPortErrors FCDataRateFCHard FCHardAddressPassword IPGatewayIPSubnetMask IsReservedRAIDCommandTimeout ResetFCPortErrorsRestoreConfiguration RGCancelAddStorageRGWaitTimeout RGDisplayRGHaltConversion RGHaltRebuildSaveConfiguration SCSIPortResetSCSIPortResetOnStartup RMStatusSerialPortBaudRate SerialPortEchoSNTPServer TailEventLogThis equipment generates, uses, and can radiate radio Further results of FCC TestingAppendix D Standards and compliances European Standards Declaration of ConformityContact Atto Technology, Inc Appendix E Warranty, contact informationManufacturer limited warranty Xxii Appendix
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