Feasability of VERY large ext3 file system?

nathan r. hruby nathan at drama.uga.edu
Wed Dec 4 16:21:01 CST 2002


On Thu, 5 Dec 2002, jason andrade wrote:

> On Wed, 4 Dec 2002, Ed Griffin wrote:
> 
> > can the filesystem options you mentioned (rw,data=writeback) be used for
> > these???  From what I remember when setting these systems up, I didn't
> > change any parameters of the RAID controllers themselves, but I do remember
> > something about a writeback option.  Should I have???
> 
> someone correct me if i'm wrong please, but i thought the above is changing
> the way the journal works so you are increasing your risk in the event of
> unexpected power outage (unlikely i know nowadays with dual power supplies
> into different UPSes on different circuits..).  personally with the large
> filesystems i am more cautious/conservative than normal because of the
> much larger data set that can be lost now (and the time to recover from said)
> 

It is, but only a little.  Ordered mode doesn't make any promises about 
data intergrity it just does its darned best to keep your data happy.

Ironically, I found this article that states the oppisite (data=journal is 
faster than ordered and writeback)
http://www-106.ibm.com/developerworks/opensource/library/l-fs8.html?dwzone=opensource

If anyone has any comments, thoughts or experince on the above link, I'd 
be interested to hear them.

-n
-- 
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nathan hruby <nathan at drama.uga.edu>
computer services specialist
uga drama
http://www.drama.uga.edu/support/
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