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Technology Stocks : EMC How high can it go?
EMC 29.050.0%Sep 15 5:00 PM EST
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To: pirate_200 who wrote (13575)12/2/2001 11:01:55 PM
From: Gus  Read Replies (1) of 17183
 
Of course it has everything to do with definitions. Since you are part of a losing minority who view SAN and NAS as mutually exclusive then start by providing a basic definition so everybody can see for themselves if the sky in your planet is blue.

Otherwise, people will continue to think that you're just anal and have nothing much to say.

Here's a clue with colorful pictures.

Storage basically comes in two types: file system-based and raw blocks. High-end RAID systems are typically raw-block devices (although the blocks are usually quite large). Users carve up the terabytes of data into hundreds of gigabyte-sized chunks (LUNs-logical unit numbers) and assign those for private and exclusive use by individual servers. Each server, in turn, places a file system on the LUN, but the server's view of the storage is block-level.

The other type of storage is based on a file system; there is an embedded engine located close to the disks, which presents the disks as a "network file system" instead of a set of raw blocks. Hosts see it as a network file system-not a block device. For simplicity, we'll call this class of devices network-attached storage (NAS) servers, which are becoming increasingly popular.....

.....SAN-attached file systems, which have been available for a few years, exploit all of the existing network protocols and can achieve high performance with zero impact on host CPU cycles via established SAN technologies. SAFSs have been deployed predominantly in niche industries and have only recently been touted as a possible solution for NAS and general-purpose file servers.

The SAFS premise is that LANs are good at many things-but data transfer is not one of them-and SANs are good at data transfers-but not good at file coordination and security. So why not combine them?

is.pennnet.com
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