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Dell PowerVault 120T DLT-7000

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Dell PowerVault 120T DLT-7000

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Surprisingly sub-par performance from a high priced vendor


from Aurora, IL

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Comments about Dell PowerVault 120T DLT-7000:

The **PowerVault 120T DLT-7000** is a fully automated, high-performance, high-capacity, seven-tape, random access autoloader/mass storage system designed to provide unattended and on-line/off-line data storage, archiving, backup, and restoration of vital system files and data.  The **PowerVault 120T DLT-7000** is designed to be used with low and mid-range servers and networks.  The **PowerVault 120T DLT-7000** is compatible with operating systems (OS) and environments that support the SCSI Ultra Wide (UW) interface, requiring either direct OS support, or a suitable application program; i.e. tape backup program such as *Veritas *Backup Exec, or *Computer Associates* ARCServe. The **PowerVault 120T DLT-7000** is a High Voltage Differential (HVD) device, and must have an HVD SCSI adapter such as the *Adaptec* **2944UW** or *Adaptec* **3944UW**. Connection of low voltage differential (LVD) or single-ended SCSI devices to the adapter will cause the bus and/or devices to become nonfunctional. The **PowerVault 120T DLT-7000** supports the DLT IV 40GB (native)/ 80GB (compressed) tape backup media.

**Installation & Performance:**

I use three Dell server platforms to host the three **PowerVault 120T DLT-7000 **Autoloaders**:**

(1) Dell PowerEdge 6450 rack mountable server with one *Adaptec* **2944UW **SCSI card, *Windows 2000 Advanced Server*, and *Computer Associates* ARCServe 2000 Tape backup software.

(1) Dell PowerEdge 6400 free standing server with one *Adaptec* **2944UW **SCSI card, *Windows 2000 Advanced Server*, and *Computer Associates* ARCServe 2000 Tape backup software.

(1) Dell PowerEdge 6400 free standing server with two *Adaptec* **3944UW **SCSI cards, *Windows 2000 Advanced Server*, and *Veritas *Backup Exec for Windows Server Version 9.1 Tape backup software.

Although each **PowerVault 120T DLT-7000** can handle up to seven DLT IV tapes, I only load five, opting to not perform backups on the weekends, and Full backups after hours.  Though rated to perform back-ups at some 36GB an hour actual throughput even of the host servers is considerably less; the three connected to my servers average 2.7GB per hour.  Throughput when backing up from the network is considerably less then 2.7GB per hour, averaging 216MB per hour via a 100Base-T Ethernet TCP/IP sub-net.

**My Viewpoint **

Given the choice, I would rather have the **PowerVault 120T DLT-7000** then not.  Utilizing an autoloader-or three in my case-greatly simplifies the often complicated and time consuming process of backing up system and data files.  Thought slower by far then advertised the **PowerVault 120T DLT-7000's **still meet our backup needs.

**PowerVault 120T Specifications:**

Tape Backup Technology

- DLT7000 tape autoloader


- Up to seven DLT IV cartridges

Storage Capacity

- Uncompressed:  245GB (DLT7000)
- Compressed 490 GB (DLT7000)

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