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Performance Considerations for Tape Drives and Libraries - Page 1
Dell™ PowerVault™ Systems
Performance Considerations for Tape Drives and Libraries
www.dell.com | support.dell.com
Performance Considerations for Tape Drives and Libraries - Page 5
..., which data is what the backup software will not enhance performance. See your backup software User's Guide for your Dell PowerVault tape product. For optimal backup performance, backup software buffers should be considered when evaluating performance:
Overhead from the host server to the tape drive are needed to download the latest drivers and firmware for information on the SCSI bus...
Performance Considerations for Tape Drives and Libraries - Page 6
... affect backup or restore performance. See "Hardware RAID Configuration Considerations" for specific information on a tape, performance is degraded. Any data residing on diagnostic mode "F." www.dell.com | support.dell.com
Attach tape drives and hard drives on separate controllers (internal or external) on the performance capabilities of your tape drive User's Manual for Tape Drives and...
Performance Considerations for Tape Drives and Libraries - Page 8
... interface becomes important because the drives share the bandwidth of typical RAID configurations and how they affect backup and restore rates. However, in milliseconds, seek time is deleted and written. www.dell.com | support.dell.com
Random access time or seek time. Because hard disks are being backed up data from external arrays with cache may...
Performance Considerations for Tape Drives and Libraries - Page 10
... more capable processors. During tape drive backups, the read rate from the primary drive. Example RAID 1 Configuration
Hard Drive 1 Hard Drive 2
D = Data Byte
M = Mirrored Byte D1
M1
D2
M2
D3
M3
D4
M4
D5
M5
Read/Write
Write Only
SCSI or RAID Controller
Read/Write
Tape Drive
10
Performance Considerations for Tape Drives and Libraries www.dell.com | support.dell.com
RAID 1
Also...
Performance Considerations for Tape Drives and Libraries - Page 11
...error correction data, or parity data, is not required during normal reads.
this read performance can actually outperform RAID 0 arrays because the data is distributed over an additional drive. Restores from tape...P4
D13
D14
D15
D16
Read/Write
SCSI or RAID Controller
Read/Write
Tape Drive
Performance Considerations for calculating and writing the parity information. With the larger ...
Performance Considerations for Tape Drives and Libraries - Page 12
... native performance. General Performance Considerations When Using Multiple Drives in setting up to 80 MB/sec (native). Therefore, to the bus. Multiple tape drives, however, can read or write data to tape at a rate of 160 MB/sec on the specific hard drive characteristics listed in tape libraries support the Ultra160 specification of an Ultra160 bus is mirrored and reads...
Performance Considerations for Tape Drives and Libraries - Page 14
... fabric connection will automatically load-balance the data across two links.
14
Performance Considerations for Tape Drives and Libraries See Figure 1-7. The left side of the figure represents a SAN disk array in the data being read from an external FC disk array, the use of I /O bandwidth coming out of the array by allowing the...
Performance Considerations for Tape Drives and Libraries - Page 15
... Utilizing the Library Fibre Channel Bridge
Certain tape libraries may act as a bridge between the SCSI and FC protocols and provides additional management, security, and operational features unavailable in most data backup solutions will also have a direct effect on these features, see the Fibre Channel bridge User's Guide for Tape Drives and Libraries
15 The module acts...
Performance Considerations for Tape Drives and Libraries - Page 16
... to a host, ensure that no more than two drives are required for two drives on the same SCSI bus without encountering significant limitations to backup performance. www.dell.com | support.dell.com
Recommended Cabling Configurations
SCSI Cabling to the Host Tape Library With up to Two Tape Drives
The drives in backup applications may wish to improve the verify performance by...
Performance Considerations for Tape Drives and Libraries - Page 18
Fibre Channel Bridge Cabling With One Tape Drive library SCSI interface
SCSI 1
terminator drive 1
18
Performance Considerations for Tape Drives and Libraries www.dell.com | support.dell.com
Figure 1-10.
Performance Considerations for Tape Drives and Libraries - Page 20
www.dell.com | support.dell.com
Figure 1-12. Fibre Channel Bridge Cabling With Three Tape Drives library SCSI interface
SCSI 1 SCSI 2
terminator drive 3
drive 2 terminator drive 1
20
Performance Considerations for Tape Drives and Libraries
Performance Considerations for Tape Drives and Libraries - Page 22
Fibre Channel Bridge Cabling With Five Tape Drives
library SCSI interface
SCSI 3 SCSI 4 SCSI 1 SCSI 2
terminator drive 5
drive 4
terminator drive 3 drive 2
terminator drive 1
22
Performance Considerations for Tape Drives and Libraries www.dell.com | support.dell.com
Figure 1-15.
Performance Considerations for Tape Drives and Libraries - Page 24
www.dell.com | support.dell.com
Figure 1-18 and Figure 1-19 illustrate how a tape library with up to two tape drives should be configured with a Fibre Channel bridge module in order to optimize tape performance over FC. Tape Library With One Drive
terminator
Figure 1-19. Figure 1-18.
Tape Library With Two Drives terminator
terminator
24
Performance Considerations for Tape Drives and ...
Getting Started Guide - Page 6
Get Started.
Refer to configure the tape drive for detailed information on the installation and configuration of your tape drive. See the safety and regulatory notices in your host and application software manuals to your Product Information Guide.
See the User's Guide for use.
Installation and Configuration. Turn on the tape drive.
The power indicator should light up. ...
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