Re: panic ffs_valloc dup_alloc

["Stephen M. Jones" <martians%sdf.org@localhost>]

> > In some cases the filesystem corruption can only be corrected by a newfs.
> 
> Does it happen with FFSv2? I also had lot of FS corruption lately. it
> only hapened on some specific machines (moving VM to another host fixed
> the problem), hence I suspected some problems with SATA controllers, I
> also had the feeling FFSv2 behaves better than FFSv1.

This is FFSv1 with various SATA controllers, I can get more specific.
In two cases it was the root file system (ffsv1) that became corrupt and
although several passes (and clearing of DUPs) with fsck marked a file
system as 'clean' the machine would ultimately kernel panic.  newfs seems
to be the only way out of that.

Can a root file system be ffsv2? I've been going with defaults to keep things
as generic as possible.