comments on newfs raw disk ? Safe ? (7 terabyte array)

[Eric Anderson]

On 02/13/07 13:01, John Kozubik wrote:
> 
> On Tue, 13 Feb 2007, Oliver Fromme wrote:
> 
>>  > > A bit careful here ...  Background fsck had some issues,
>>  > > especially when the machine crashed or is otherwise reset
>>  > > while the background fsck is still running.  It resulted
>>  > > in corruption that could not be repaired by fsck anymore.
>>  > > I don't know if all of those issues have been resolved in
>>  > > RELENG_6, but personally I always disable background fsck
>>  > > on all of my machines, just to be safe.
>>  >
>>  > [...]
>>  > UFS2 snapshots are dangerous and unstable,
>>  > and have been since their introduction in 5.x [2].
>>
>> That's not what I wrote.  I wrote that they _had_ issues,
>> and that I do not know if they have been fixed.  I don't
>> recall any reports of problems recently (i.e. in the past
>> few months), and there are no open PRs that seem to relate
>> to the current code, so those issues may very well have
>> been fixed.  It's just my personal paranoia that lets me
>> disable bg fsck on my machines (and I don't really need
>> bg fsck anyway).
> 
> 
> Fair enough.  For your information, they are still dangerous and
> unstable[1][2][3].  Your initial assessment is still valid today,
> unfortunately.  FWIW, [1] is open and relates to the current code.
> 
> It (bg_fsck and UFS2 snapshots) has gotten better over time - but it is
> still not something that I feel is fair to enable by default, as if it
> were rock solid, and force it onto unsuspecting end users who are not as
> well informed as you and I are.

Uhh, aren't those threads below at *least* a year old, or am I 
misreading it?  If so - then I think you in fact need to become more 
informed, since massive UFS updates have been done in the past 6 months. 
  If you have pointers to more recent issues, please post them..

Eric



> [1] http://lists.freebsd.org/pipermail/freebsd-bugs/2006-January/016703.html
> [2] http://lists.freebsd.org/pipermail/freebsd-bugs/2004-July/007574.html
> [3] [2, above] has been fixed, but large quantity inode movements keep
>     coming back to haunt snapshots every other release or so...
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