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12/31/2006 at 02:40PM PST, ID: 22107385
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7.2

DAS or NAS. Am I crazy?

Asked by jimbecher in Hard Drives & Storage, Tivoli Storage Manager

Tags: nas, das

  I have a customer twho is going to start scanning documents like there is no tommorrow. They have a Windows 2003 Server and the storage capacity will not be near enough for their scanning requirements. Best guess they will be scanning about 90GB a year. The vendor supplying the scanning software wants to put on a DAS (Direct Attached Storage) unit consisting of a U320 SCSI controller and an external SAS (Serial Attached SCSI) unit. The price if this is great. About $14,000 for a 1.5TB unit with backup software, etc.

   I have been looking at NAS (Network Attached Storage) units that only run about $1500 for 1.5TB. My question is this. Is DAS really needed? I know that since it is directly attached to the bus on the server that the I/O between the DAS unit and the server can't be beat but I am wondering if that is really needed. My thought is that the bottleneck is going to be in the network cable (100Mbps). Wheather thay are scanning new documents or retrieving previously scaned documents both units (DAS or NAS) will read or write to their respective hard drives infinitely faster then the network cables can transport it.

   That being the case I would be in favor of NAS for two reasons. One would be to relieve the server of the extra burden and the second would be that I could buy a second (and even third) NAS unit for backing up the first NAS unit and still come out thousands ahead. There must be something I am missing but I can't figure out what. Is my thought process fatally flawed?

Feedback please!


[+][-]12/31/06 06:09 PM, ID: 18222799

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Zones: Hard Drives & Storage, Tivoli Storage Manager
Tags: nas, das
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Solution Provided By: ronayers
Participating Experts: 6
Solution Grade: A
 
 
[+][-]12/31/06 07:49 PM, ID: 18222973

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