Re: Less disk space with reiser4?

[David Masover <ninja@slaphack.com>]

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Stefan Andersson wrote:
> Alex Zarochentsev wrote:
> 
>> On Wed, Apr 13, 2005 at 02:51:13PM +0200, Stefan Andersson wrote:
>>  
>>
>>> Thanks for all the answers.
>>>
>>> Now would it be possible to change the 5% to something else?
>>>   
>>
>>
>> even if the fs would be unreliable?
>>  
>>
> That is what I want to test, or if someone knows the answer to that.

The only indication I've heard that it would make the FS unreliable is
if you had less space reserved than you had RAM available to stack up
writes which haven't been allocated.  In your case, it's a bug that you
haven't been able to set this on your own.

Note that I said unreliable, not slow.  Everyone keeps telling us that
you'll get slow with <25% space available, so the 5% is really just a
sanity check, but you're probably fine there, too.

My question to the Namesys guys is, have you actually tested situations
like this?

If you want to artificially create that situation, you can probably just
shrink the values down a bunch -- make an fs on a 1 gig drive on a
virtual machine (qemu + accelerator) with only a couple megs of RAM
available for cache/buffer, then try to fill it.  How close can you get
to 100% full before something blows up?

I'd do it, but I've got problems with school and bad RAM.

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