Re: selectively disabling atime updates?

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

On Jun 11, 2012, at 3:45 PM, Edgar Fuß wrote:

>> This makes me think that /etc/daily should take similar steps,
>> whatever they turn out to be.
> Yes, allthough my RAIDframe performance test results show that the effect
> decreases with larger block sizes.
> 
> I can think of two ways to acheive this (each of which may be absurd given
> better knowledge of fs internals than I have): Either a per-process switch
> disabling atime updates or a way to obtain a read-only clone of a block
> device which can be mounted ro,noatime.
> 
> Maybe fss is a way to go, but it's still marked experimental in 6.0 and
> taking the snapshot may outweigh the later performance gain.

No, snapshots are supported in 6.0.  Taking a file system external snapshot
should be a quick task -- taking a file system internal snapshots is a
time consuming task dependent on the size of the file system. 

--
Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig 
(Germany)