which file system to use

[Alexander Skwar]

· Tom Smith <tom71713-ubuntu at yahoo.com>:

> 
> 
> Alexander Skwar wrote:
> 
>>David Abrahams <dave at boost-consulting.com>:
>>
>>  
>>
>>>Alexander Skwar <listen at alexander.skwar.name> writes:
>>>
>>>    
>>>
>>>>John L Fjellstad <john-ubuntu at fjellstad.org>:
>>>>
>>>>      
>>>>
>>>>>Alexander Skwar <listen at alexander.skwar.name> writes:
>>>>>
>>>>>        
>>>>>
>>>>>>The commit is not (only) because of atime. ext3 will commit to
>>>>>>disk, even if *nothing* has been accessed.
>>>>>>
>>>>>>That said, laptop-mode is a good suggestion.
>>>>>>          
>>>>>>
>>>>>Looking at the mount options for ext3, there is a commit option
>>>>>(although the default is set to 5 sec, so I'm not sure it's that which is
>>>>>causing the disk access).  If it is the cause of the disk access, I
>>>>>would think changing this option to something else (60 sec or whatever),
>>>>>might help.
>>>>>        
>>>>>
>>>>Well - turning on/off the hd every 60 seconds isn't *THAT* much
>>>>better, is it? ;) I'd rather set it to 1 hour, or so. BUT: If
>>>>the system crashes, you'll lose the not yet written data. Ie.
>>>>up to 1 hour would be lost.
>>>>
>>>>Because of this and because of the slowness, I'd not suggest ext3
>>>>but rather JFS.
>>>>      
>>>>
>>>[I have a couple of machines (a laptop and a server) with fresh
>>>installs on ext3, and at least one of them probably needs a full
>>>reconfiguration, so I'm following this thread with great interest.]
>>>
>>>Two questions:
>>>1. Does JFS always commit immediately?
>>>    
>>>
>>
>>I don't know for sure, but I don't think, it'll commit *immediately*.
>>This would be bad performancewise, I'd think. I'd suspect, that it,
>>let's say, "groups" together requests, so that the disk access can
>>be minimized.
>>  
>>
> Alex, if JFS doesn't commit "immediately", *then that is not a valid 
> reason to use it on a laptop versus using ext3*

As far as I understand it, ext3 accesses the disk even if there's
nothing to commit. Other FS don't do that.

Alexander Skwar
-- 
Schönheit ohne Anmut ist ein Angelhaken ohne Köder.
                -- Ninon de Lenclos