background fsck can be dangerous!

[Jorn Argelo]

JM wrote:

> Brian Fundakowski Feldman wrote:
>
>> On Wed, Jun 29, 2005 at 03:12:37PM +0100, Steven Hartland wrote:
>>  
>>
>>> I've not had a single crash / power outage that background fsck has
>>> been able to deal with. 90% of the time the machine will fail to even
>>> boot to single user mode :(
>>>   
>>
>>
>> You should turn write caching off on your drives.
>>  
>>
> and in addition to that... you can enable a foreground fsck at boot 
> which might be the better option if boot times aren't an issue.


May I ask how I can do that? Because I've always prefered foreground 
fsck then background fsck to be honest. At least you can see what the 
machine is doing.

Jorn

>
>>  
>>
>>>   Steve
>>> ----- Original Message ----- From: "Niki Denev" <ndenev at icdsoft.com>
>>>
>>>   
>>>
>>>> I want just to share my last experience with the combination of
>>>> power failure + background fsck. After the power returned and the 
>>>> machine booted, it sheduled background fsck after 60 seconds, but
>>>> at this point most of the services were already started, and some 
>>>> of them seemed to rely on files that were probably in unclean state 
>>>> before the check.
>>>> This unfortunately leaded to some lost email...after the fsck 
>>>> completed,
>>>> everything runs ok, but i have now set background_fsck to NO in 
>>>> rc.conf.
>>>>
>>>> Here is a sad sample from my qmail log file :
>>>> @4000000042c1badc24fc21cc delivery 1: success: 
>>>> /libexec/ld-elf.so.1:_Shared_object_"libpq.so.3"_not_found,_required_by_"dspam"/did_0+0+1/ 
>>>>
>>>> @4000000042c1badc24fff25c status: local 2/30 remote 0/20
>>>> @4000000042c1badc250151ec delivery 4: success: 
>>>> /libexec/ld-elf.so.1:_Shared_object_"libpq.so.3"_not_found,_required_by_"dspam"/did_0+0+1/ 
>>>>
>>>> @4000000042c1badc2502bd34 status: local 1/30 remote 0/20
>>>> @4000000042c1badc25050ef4 end msg 23982
>>>> @4000000042c1badc2508b0a4 delivery 2: success: 
>>>> /libexec/ld-elf.so.1:_Shared_object_"libpq.so.3"_not_found,_required_by_"dspam"/did_0+0+1/ 
>>>>
>>>> @4000000042c1badc250a9cd4 status: local 0/30 remote 0/20
>>>> @4000000042c1badc250c7d4c end msg 24087
>>>> @4000000042c1badc2510942c end msg 24040
>>>>     
>>>
>>
>> The filesystem looks the same before, during, and after background
>> fsck runs, other than the free space information.
>>
>>  
>>
>
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