[Novalug] ext4 vs. ext3 vs. ext2
Jon LaBadie
novalugml@jgcomp.com
Mon Sep 7 17:06:08 EDT 2009
On Mon, Sep 07, 2009 at 04:53:22PM -0400, James Ewing Cottrell 3rd wrote:
> Adding a journal is as simple as adding a -j flag to mke2fs.
>
> Journaling is ALWAYS useful, as ANY unclean shutdown will for an Entire
> Scan, even if there is no corruption, whereas the Journal will assure
> that you scan No more Than is Needed.
>
> The lone exception I would make for Journals would be Flash Drives,
> altho I recently read a paper which said that their overhead was pretty
> negligible.
>
> What IS of great use is to use "noatime" on EVERY filesystem. Unless you
> have a specific reason, atime is Essentially Useless.
>
> And I am baffled by relatime...what does it accomplish?
>
If I understand it correctly, linux's noatime doesn't
update atime at all. relatime is more like the noatime
in Solaris, atime is updated only if ctime or mtime is
also being updated.
--
Jon H. LaBadie jon@jgcomp.com
JG Computing
12027 Creekbend Drive (703) 787-0884
Reston, VA 20194 (703) 787-0922 (fax)
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