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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
... maximum transfer speeds. Some applications allow the user to download the latest drivers and firmware for multidrive units, as well as recommended cabling configurations, are discussed in "General Performance Considerations When Using Multiple Drives in this section apply to the tape drive are needed to and from SCSI commands. See your backup software User's Guide for information...
Performance Considerations for Tape Drives and Libraries - Page 6
... of your tape drive User's Manual for its buffers to ensure maximum throughput.
For example, the Dell PowerVault 110T (LTO2 and LTO3) tape drive matches speed down to clean the drive heads on the drive and media. www.dell.com | support.dell.com
Attach tape drives and hard drives on separate controllers (internal or external) on diagnostic mode "F."
Speed matching. Hard Drive and...
Performance Considerations for Tape Drives and Libraries - Page 7
... drive's spindle speed determines how many times per minute the drive platter assembly can further affect the throughput of data. Performance Considerations for Tape Drives and Libraries
7 Backing up . Two-Channel Bandwidth
Single Shared LUN
Single LUN with Backup data and OS
Separate LUNs
OS LUN
Backup Data LUN
SCSI or RAID Controller
SCSI or RAID Controller
Tape Drive
Tape Drive...
Performance Considerations for Tape Drives and Libraries - Page 8
... is the amount of the disk. In the case of a RAID configuration, the speed of the interface becomes important because the drives share the bandwidth of typical RAID configurations and how they affect backup and restore rates. www.dell.com | support.dell.com
Random access time or seek time. The buffer is deleted and written. The...
Performance Considerations for Tape Drives and Libraries - Page 9
... for reading and writing to the array.
Example RAID 0 Configuration
Hard Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4
D = Data Byte D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
SCSI or RAID Controller
Tape Drive
Performance Considerations for a single hard disk. Thus, the throughput is...
Performance Considerations for Tape Drives and Libraries - Page 10
... to error checking/correction (ECC) included in writing to newer and more capable processors. Figure 1-3. If one drive fails, the system switches to the fact that the mirroring is often performed on the CPU or RAID controller.
Much of this inefficiency is due to the other drive without losing data. www.dell.com | support.dell.com...
Performance Considerations for Tape Drives and Libraries - Page 11
...nominal because it involves additional overhead for Tape Drives and Libraries
11 In additional, parity information is distributed over an additional drive.
Figure 1-4. RAID 5
With a RAID... at the byte level and error correction data, or parity data, is also striped across the disk array. Example RAID 5 Configuration
Hard Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4
P = Parity Byte
...
Performance Considerations for Tape Drives and Libraries - Page 12
... RAID 5 improves if more than two tape drives to each tape drive to achieve maximum performance, backup servers utilizing SCSI must be used, but does not allow each SCSI bus. General Performance Considerations When Using Multiple Drives in Tape Libraries
When multiple tape drives are added to a point. A SCSI HBA that supports data speeds of the RAID configuration. In addition...
Performance Considerations for Tape Drives and Libraries - Page 13
... is read from the source and then written out to operate multiple tape drives across a number of these factors can potentially exceed the full bandwidth of external storage arrays. Therefore, when using three or more tape drives simultaneously on a single link. Therefore, during a backup operation as it overcomes the distance limitations of SCSI (12 meters for...
Performance Considerations for Tape Drives and Libraries - Page 14
... a bottleneck that slows data flow to transmit across two links.
14
Performance Considerations for Tape Drives and Libraries www.dell.com | support.dell.com
Figure 1-6. 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 data is...
Performance Considerations for Tape Drives and Libraries - Page 16
... controller SCSI cable
Tape Library With up to Six Tape Drives When the tape library is SCSI-attached to a host, ensure that no more than two drives are required for two drives on separate buses. 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 improve...
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
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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
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Performance Considerations for Tape Drives and Libraries
Performance Considerations for Tape Drives and Libraries - Page 22
www.dell.com | support.dell.com
Figure 1-15. 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
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Performance Considerations for Tape Drives and Libraries
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