Writing contigiously to UFS2?

Ivan Voras ivoras at freebsd.org
Fri Sep 21 04:36:31 PDT 2007

Fluffles wrote:

> Even worse: data is being stored at weird locations, so that my energy 
> efficient NAS project becomes crippled. Even with the first 400GB of 
> data, it's storing that on the first 4 disks in my concat configuration, 

> In the past when testing geom_raid5 I've tried to tune newfs parameters 
> so that it would write contiguously but still there were regular 2-phase 
> writes which mean data was not written contiguously. I really dislike 
> this behavior.

I agree, this is my least favorite aspect of UFS (maybe together with 
nonimplementation of extents), for various reasons. I feel it's time to 
start heavy lobbying for finishing FreeBSD's implementations of XFS and 
raiserfs :)

(ZFS is not the ultimate solution: 1) replacing UFS monoculture with ZFS 
monoculture will sooner or later yield problems, and 2) sometimes a 
"dumb" unix filesystem is preferred to the "smart" ZFS).

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