Date: Wed, 17 Feb 2010 09:56:57 +0100 From: Bartosz Stec <bartosz.stec@it4pro.pl> To: freebsd-stable@freebsd.org Subject: Re: ZFS tuning [was: hardware for home use large storage] Message-ID: <4B7BAF59.7040407@it4pro.pl> In-Reply-To: <20100217093237.fe4b4e14.torfinn.ingolfsen@broadpark.no> 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>
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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.
--
Bartosz Stec
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