mongodb logs & performances - mongodb-dev

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Message from discussion mongodb logs & performances
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Date: Sun, 4 Nov 2012 09:30:11 -0500
Message-ID: <CA+C=T4AJa10eXg8MQNOtiuCA+83iQEwsaHnWAXd7YeEC_xn...@mail.gmail.com>
Subject: Re: [mongodb-dev] mongodb logs & performances
From: Eliot Horowitz <el...@10gen.com>
To: mongodb-dev@googlegroups.com
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I would keep it local.
The log writing is buffered, and is highly unlikely to cause performance
problems with the system.


On Wed, Oct 24, 2012 at 10:42 AM, St=E9phane <stephane.cize...@gmail.com>wr=
ote:

> Hello,
> I have a question about mongodb logs and performances.
> I have a replicaset, each mongod instance runs on a Red Hat linux machine=
.
> Each machine has a 2 drives : a local hard disk (ext4 format)  and a
> netwok file system.
> The mongo dbpath is located on the local hard disk.
> I have doubts concerning the log files location, I have 2 solutions :
> 1. If the log files are located on the hard disk, the logging performance=
s
> are good but the IO activity is increased on the local hard disk and I
> suppose that it could decrease the global performances ?
> 2. If the log files are located on the netwotk file system, the IO
>  activities (logs and datas) are separated. But, in this case, the loggin=
g
> performances are worse than the local location and I don't know if the
> global performances can be affected/decreased ?
> If someone can suggest me the best configuration, it will be very useful
> for me.
>
> Best regards
> St=E9phane
>
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I would keep it local.<div>The log writing is buffered, and is highly unlik=
ely to cause performance problems with the system.</div><div class=3D"gmail=
_extra"><br><br><div class=3D"gmail_quote">On Wed, Oct 24, 2012 at 10:42 AM=
, St=E9phane <span dir=3D"ltr">&lt;<a href=3D"mailto:stephane.cizeron@gmail=
.com" target=3D"_blank">stephane.cize...@gmail.com</a>&gt;</span> wrote:<br=
>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hello,<div>I have a question about mongodb l=
ogs and performances.</div><div>I have a replicaset, each mongod instance r=
uns on a Red Hat linux machine.=A0</div>
<div>Each machine has a 2 drives : a local hard disk (ext4 format) =A0and a=
 netwok file system.</div><div>The mongo dbpath is located on the local har=
d disk.</div><div>I have doubts concerning the log files location, I have 2=
 solutions :</div>
<div>1.=A0If the log files are located on the hard disk, the logging perfor=
mances are good but the IO activity is increased on the local hard disk and=
 I suppose that it could decrease the global performances ?</div><div>2. If=
 the log files are located on the netwotk file system, the IO =A0activities=
 (logs and datas) are separated. But, in this case, the logging performance=
s are worse than the local location and I don&#39;t know if the global perf=
ormances can be affected/decreased ?</div>
<div>If someone can suggest me the best configuration, it will be very usef=
ul for me.</div><div><br></div><div>Best regards</div><span class=3D"HOEnZb=
"><font color=3D"#888888"><div>St=E9phane</div><div><br></div>

<p></p>

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</font></span></blockquote></div><br></div>

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