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On Tue, 27 Jun 2000, Bill Studenmund wrote:

>I'm not sure of the details of Vinum, but RIDFrame and LVM's in general
>are trying to solve different problems. Raid stuff is trying to be a disk,
>while LVMs are creating partitions.
[...]
>The thing I like about LVMs is stuff I've done with AIX. I was able to
>grow logical volumes on the fly, and then grow the file system to take
>advantage of the extra space. There were times I started a program,
>realized it would run out of space, and grew the partition before the
>program ran out of space. :-)

In principle I'm aware of the difference between RAID systems and LVM's,
having used SGI's, Sun's (really Veritas'), and to some extent IBM's LV
systems, but I had been under the impression that one of the key
features of an LVM is integration with the file system it is used with
- -- for example the resizable live filesystem capability on AIX is more a
feature of IBM's JFS, and SGI's logical volume system is inextricably
linked with the non-LVM features of its XFS implementation.  It is my
impression from the USENIX paper last year that Vinum is not integrated
with any file system, though I may be confused...

So, I guess what I'm not sure of in your answer is:  What features of
Vinum, not present in RF, make it an LVM as opposed to a RAID system?

- -- 
				Jim Wise
				jwise@draga.com


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