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тАО06-04-2009 06:40 PM
тАО06-04-2009 06:40 PM
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тАО06-04-2009 08:41 PM
тАО06-04-2009 08:41 PM
Re: Can someone list the advantages of NAS over SAN ?
Each technology has its own advantages and disadvantages - there is no single 'perfect solution' for all uses.
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тАО06-04-2009 08:59 PM
тАО06-04-2009 08:59 PM
Re: Can someone list the advantages of NAS over SAN ?
A Network Attached Storage (NAS) node are generally self contained and use a DAS (Direct Attached Storage) technology while others, like the HP Proliant DL380 Storage Server, usually come with some limited amount of local storage.. but you then connect it to a MSA or an EVA or some other Storage Array to server up gobs more.
A Storage Area Network (SAN) technically refers to the infrastructure behind a storage solution, but is commonly used to describe storage arrays such as the MSA or the EVA and even the XP.
Steven
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тАО06-04-2009 10:05 PM
тАО06-04-2009 10:05 PM
Re: Can someone list the advantages of NAS over SAN ?
they can (and often do) work together in an environment.
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тАО06-04-2009 10:56 PM
тАО06-04-2009 10:56 PM
Re: Can someone list the advantages of NAS over SAN ?
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тАО06-04-2009 11:05 PM
тАО06-04-2009 11:05 PM
Re: Can someone list the advantages of NAS over SAN ?
J.
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тАО06-04-2009 11:14 PM
тАО06-04-2009 11:14 PM
SolutionOn the low-level, both technologies work with blocks. Some SAN arrays can provide a snapshot-based replication, too.
Full-change replication like CA-EVA and snapshot-based replication are just different uses - each one has its own advantages / disadvantages.
> A Snapshot can be tiny compared to its source volume and in SAN it requires a block by block copy, even if blocks are empty.
Not true for vsnaps on the EVA, for example. I think you are confusing Snapshots with volume clones.
> A mirror machine must be equal to or greater in capacity compared to the source volume.
Not true, unless I misunderstood. On all arrays I am familiar with you can replicate a subset of the total storage ressources, so the destination system can be smaller.
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тАО10-15-2009 08:29 AM
тАО10-15-2009 08:29 AM
Re: Can someone list the advantages of NAS over SAN ?
Trying to simplify in case this is searched on:
Operating systems generally deal with files, where an application (like Oracle) may deal with blocks or files. Blocks used to be much better for performance and security of an application. That has been changing over time as NAS technology has matured.