Re: Recommended minimal amount of free space to keep?

     Hello.
     Thanks a lot for the information and hints!
     I think some long time ago I have read somewhere that 70% full =

utilization is a good limit but couldn't find it on the net now though, =

thats why I asked here, thanks for confirming that.
     So, is a percentage thing, not a free space absolute value right?
     If we have a 1000G filesystem then we should have at least 300G =

free to avoid fragmentation in the long term? Or for that filesystems we =

could have just 50G free and get away with it long term?
     Maybe these hints could be in the ext4 manpage or maybe in the wiki.
     Again: thanks!!!
     Bye.



El 07/06/14 22:47, Andreas Dilger escribi=F3:
> You will get better long- term performance if you don't fill the
> filesystems more than about 70% full. Above 90% you are permanently
> fragmenting the filesystem (depends on total size and workload also).
>
> There is the secondary issue that mke2fs can lay out the filesystem
> better if it is done right at the start rather than resize2fs doing it in
> small increments.  I think as long as you are growing each filesystem
> in chunks of, say, 16GB or more the performance should stay reasonable.
>
> In many cases, you can have a rough guess at how much space you will
> need in the filesystems, so it doesn't make sense to keep huge amounts
> of free space around.
>
> Cheers, Andreas
>
>> On Jun 6, 2014, at 17:57, Ivan Baldo <[email protected]> wrote:
>>
>>     Hello.
>>     So, LVM is cool, having different partitions for different stuff is =
cool, and of course Ext4 is cool and *reliable*.
>>     So, we create some logical partitions and put ext4 on them, reservin=
g LVM space for growing those partitions or even making new ones later.
>>     The thing is, I would like to keep every filesystem as small as it c=
an be, but without degrading the performance too much.
>>     I guess that having a filesystem 99% full will create too much fragm=
entation and many other issues, but having them only 30% full seems like a =
waste.
>>     Currently I try to keep them at 70% full utilization but I have not =
based that on anything just guess.
>>     So, what % hysteresis do you recommend? For example, when they get 7=
0% full then grow them so that they get 50% full? Other values?
>>     Thanks for the hints!
>>     Good day everyone.
>>

-- =

Ivan Baldo - [email protected] - http://ibaldo.codigolibre.net/
 From Montevideo, Uruguay, at the south of South America.
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