lkml.org 
[lkml]   [2004]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Is there a way to keep the 2.6 kjournald from writing to idle disks? (to allow spin-downs)


Lutz Vieweg wrote:

> Felipe Alfaro Solana wrote:
>
>> On Sun, 2004-01-25 at 19:29, Lutz Vieweg wrote:
>>
>>> I run a server that usually doesn't have to do anything on the local
>>> filesystems,
>>> it just needs to answer some requests and perform some computations
>>> in RAM.
>>>
>>> So I use the "hdparm -S 123" parameter setting to keep the (IDE)
>>> system disk from
>>> spinning unneccessarily.
>>>
>>> Alas, since an upgrade to kernel 2.6 and ext3 filesystem, I cannot
>>> find a way to
>>> let the harddisk spin down - I found out that "kjournald" writes a
>>> few blocks every
>>> few seconds.
>>>
>>> As I wouldn't like to downgrade to ext2: Is there any way to keep
>>> the 2.6 kjournald
>>> from writing to idle disks?
>>>
>>> I cannot see a good reason why kjournald would write when there are
>>> no dirty buffers -
>>> but still it does.
>>
>>
>>
>> Have you tried playing with the laptop-mode patch? It's already in the
>> -mm kernel tree from Andrew Morton. I've been playing with it a little
>> (just a few minutes) and seems keep the disks spun down for some time.
>
>
> This "laptop-mode" patch would make things far worse than they're now:
> Spinning
> up the disk about every 10min would reduce their lifetime
> significantly instead
> of extending it.
>
> It's not a laptop, but a server with an ordinary 3.5" harddisk I'm
> speaking about,
> my goal is not saving power, but spinning down a harddisk that does
> not need to
> spin up the whole day long.
>
> What I'm questioning is whether there's a need to write to idle disks
> at all -
> does anybody know why kjournald writes data even if there is nothing
> to commit at all?


Because you aren't using the noatime option?


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:00    [W:0.100 / U:0.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site