On Oct 9, 2011, at 1:49 PM, Dan wrote:

> Locking was done at the record, block, and file level.  Very cool.  Very 
> disappointing that this type of high reliability file system went the way of 
> the dodo, except for enterprise Unix solutions.  It's something that I think 
> OS X should have had built-in since 10.1. sigh.  Defeat from the jaws of 
> victory.  sigh.

Not really. It took a while but a SAN does all of that and more CPUs don't ever 
have to know anything about available storage, it's like they're automagically 
growing hard drives.  Why build somethingnto the OS you don't need to, when you 
just connect to the storage appliance like it was another hard drive.

The DEC solution above restricts you to all systems runnig the same OS. A SAN 
doesn't care what the front end OS is.

And the thing is, OS X DID have high-reliability file systems built in since 
10.1: NFS. NFS is high speed, high reliablity and only a moderate pain in the 
ass to manage.

-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs

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