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Technology Stocks : Network Appliance

NTAP 115.78

+3.1%

3:59 PM EST

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To: D. K. G. who wrote (4180)	8/28/2000 10:40:23 PM
From: DownSouth	Read Replies (1) of 10934

Thanks for the good find. This reminds me, the folks at SUNW talk about "snapshot" on their NAS product. Be aware that Sun's "snapshot" is merely a full backup with periodic incrementals. It is NOT anything like NTAP's SNAPSHOT, which is an inherent feature of the WAFL file system design. SNAPSHOT is not a copy of the file system at a point in time; it is a copy of the root inode at a point in time, pointing to all of the inodes at that point in time. So data blocks that are still in Snapshot directories are not deleted by the file system, though those data blocks may no longer be pointed to by subsequent inode directories because data in the block has changed. For a complete explanation see this: netapp.com (This paper is at least 5 years old and gives you the basics of NTAP's WAFL.)

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