Re: ext4 defaults and access time

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On Wed, Feb 3, 2010 at 1:11 AM, Rick Stevens-2 [via Fedora Users]
<ml-node+183782-2038788444@xxxxxxxxxxxxx> wrote:
> On 02/02/2010 02:08 PM, Roberto Ragusa wrote:
>> Andras Simon wrote:
>>> On 2/2/10, Roberto Ragusa<[hidden email]>  wrote:
>>>> Andras Simon wrote:
>>>>> All my partitions are ext4 and mounted with ext4 defaults from fstab.
>>>>> Still, sometimes it's as if noatime was used:
>>>> Defaults are sometimes surprising.
>>>> Let's have a look at
>>>>    cat /proc/mount
>>>
>>> I think you're onto something...
>>>
>>> /dev/sda5 /home ext4 rw,seclabel,relatime,barrier=1,data=ordered 0 0
>>>
>>> I definitely don't want relatime there. Would something like
>>>
>>> .... ext4    defaults,atime ....
>>>
>>> in fstab get rid of this?
>>
>> There is a norelatime option, but it could be not enough.
>>
>> I had this kind of problem some time ago and Kevin Fenzi told me
>> how to do it:
>>
>> http://marc.info/?l=fedora-devel-list&m=121542196521553&w=2
>> http://marc.info/?l=fedora-devel-list&m=121545811619620&w=2
> Try adding "strictatime" to the fstab options.  This permits overriding
> any kernel defaults (e.g. ext4 defaulting to "relatime").

Can someone explain why it would be desirable to go to atime for the
mounts, which I understand is an expensive option in terms of IO? I
thought that the move to relative as default was a carefully
considered issue by kernel developers?


-- 
mike

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