Date: Wed, 17 Feb 2010 04:53:20 -0500 From: jhell <jhell@DataIX.net> To: Bartosz Stec <bartosz.stec@it4pro.pl> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS tuning [was: hardware for home use large storage] Message-ID: <alpine.BSF.2.00.1002170450260.66097@pragry.qngnvk.ybpny> In-Reply-To: <4B7BAF59.7040407@it4pro.pl> References: <cf9b1ee01002150049o43fced71ucb5776a0a1eaf4cf@mail.gmail.com> <20100215090756.GA54764@icarus.home.lan> <20100215105000.101326yj01j0f64g@webmail.leidinger.net> <20100215122744.GA57382@icarus.home.lan> <20100215161105.14071eiflhc9le68@webmail.leidinger.net> <4B79BA9C.3020402@quip.cz> <alpine.BSF.2.00.1002152024040.74553@pragry.qngnvk.ybpny> <4B7AD0A3.9080701@barryp.org> <20100216175946.GA98082@icarus.home.lan> <20100216200511.GA95812@server.vk2pj.dyndns.org> <20100216215637.GA4299@icarus.home.lan> <alpine.BSF.2.00.1002170241080.14189@pragry.qngnvk.ybpny> <4B7BA6A5.9020306@it4pro.pl> <20100217093237.fe4b4e14.torfinn.ingolfsen@broadpark.no> <4B7BAF59.7040407@it4pro.pl>
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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@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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