ZFS tuning [was: hardware for home use large storage]

[jhell]

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On Wed, 17 Feb 2010 03:56, bartosz.stec@ wrote:
> On 2010-02-17 09:32, Torfinn Ingolfsen wrote:
>> On Wed, 17 Feb 2010 09:19:49 +0100
>> Bartosz Stec<bartosz.stec at it4pro.pl>  wrote:
>>
>> 
>>> So here's my reply (last line seems most interesting ;) :
>>> 
>> [...snipped...]
>> 
>>> Illegal division by zero at ./arc_summary.pl line 242.
>>> 
>> FWIW, I also got this line when I ran this script on my idle zfs server.
>> 
> I'm not a PERL programmer (or programmer at all ;), but what I see is script 
> doesn't check if L2ARC is used at all, so it will always try compute these 
> lines:
>
> printf("\tL2 Hit Ratio:\t\t\t%0.2f%%\t%d\n", 100 * ( $l2_hits / ( $l2_hits + 
> $l2_misses )), $l2_hits );
> printf("\tL2 Miss Ratio:\t\t\t%0.2f%%\t%d\n", 100 * ( $l2_misses / ( $l2_hits 
> + $l2_misses )), $l2_misses );
> printf("\tL2 Feeds Ratio:\t\t\t%0.2f%%\t%d\n", 100 * ( $l2_feeds / ( $l2_hits 
> + $l2_misses )), $l2_feeds );
>
> Without active L2ARC it will always generate divide at zeo error, so it seems 
> that additional check for usable L2ARC values is needed at first place.
>
>

Thanks for reporting this. As I am usually on a system that is using a 
L2ARC I wouldn't have noticed it.

I should have this fixed in about 10 hours. But as I am writing this email 
I am heading off to bed, work calls in the morning.

Check back tomorrow night for a updated version and adjust the current to 
your liking for the moment.

;) Thanks again.

- -- 

  jhell

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