Date: Wed, 17 Feb 2010 06:18:01 -0500 From: jhell <jhell@DataIX.net> To: Bartosz Stec <bartosz.stec@it4pro.pl> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: ZFS tuning [was: hardware for home use large storage] Message-ID: <alpine.BSF.2.00.1002170613530.18545@pragry.qngnvk.ybpny> In-Reply-To: <alpine.BSF.2.00.1002170450260.66097@pragry.qngnvk.ybpny> 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> <alpine.BSF.2.00.1002170450260.66097@pragry.qngnvk.ybpny>
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Wed, 17 Feb 2010 04:53, jhell@ wrote:
> ---------------------------- PGP Command Output ----------------------------
> gpg: Signature made Wed Feb 17 04:53:27 2010 EST using RSA key ID 89D8547E
> gpg: Good signature from "jhell <jhell@DataIX.net>"
> ----------- Begin PGP Signed Message Verified 2010-02-17 06:13:53 ----------
>
>
>
> 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
>
>
> ------------ End PGP Signed Message Verified 2010-02-17 06:13:53 -----------
>
I take that back.
I just uploaded a modified version that I wrapped with a if statement to
check and see if l2_hits >= 0.
If you don't have a L2ARC you will now get a message explaining why its not
included in your summary.
I couldn't sleep until I fixed this knowing that more people are probably
going to come across this problem and email back.
New rev: 184
MD5 (arc_summary.pl) = f47bac165e7bf707d5f81cfdd007c30a
SHA256 (arc_summary.pl) = 794dce069ff649598d99204b362d141a19da47dcf60ec165b260d55a5c9d493f
SIZE (arc_summary.pl) = 12695
http://jhell.googlecode.com/files/arc_summary.pl
http://jhell.googlecode.com/files/arc_summary.pl.asc
Now I can finally sleep ;)
- --
jhell
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