Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (athena.apache.org: local policy includes SPF record at
 spf.trusted-forwarder.org)
MIME-Version: 1.0
In-Reply-To: 
 <CAHwsXY=5bU7uxMo8GP1XkKiu7FN+ahNMCJ2Mi1VNy07dtFoHjg@mail.gmail.com>
References: 
 <CA+O6_FcGe11yM7Zu=YjC=u9SakHTQet03CA7PzN1WDzMCOfFPQ@mail.gmail.com>
	<CAHwsXY=5bU7uxMo8GP1XkKiu7FN+ahNMCJ2Mi1VNy07dtFoHjg@mail.gmail.com>
Date: Sat, 16 Nov 2013 11:17:50 -0500
Message-ID: 
 <CADjRqh-mWSSoZ4BCMtVR0v6A_UP5bEroHFwY0WXy29rWpodHYA@mail.gmail.com>
Subject: Re: Commit log on USB flash disk?
From: Tupshin Harper <tupshin@tupshin.com>
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=089e0122a8120456bf04eb4da8ab

--089e0122a8120456bf04eb4da8ab
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

It's conceivable that one of the faster USB 3.0 sticks would be sufficient
for this. I wouldn't exactly call it an "enterprise" configuration, but
it's worth considering. Keep in mind that if you are comfortable using your
RF for durability, you can turn off durable_writes on your keyspace and not
write to the commitlog at all.


On Sat, Nov 16, 2013 at 11:05 AM, Philippe <watcherfr@gmail.com> wrote:

> Hi david, we tried it two years ago and the performance of the USB stick
> was so dismal we stopped.
> Cheers
>  Le 16 nov. 2013 15:13, "David Tinker" <david.tinker@gmail.com> a =E9crit=
 :
>
> Our hosting provider has a cost effective server with 2 x 4TB disks
>> with a 16G (or 64G) USB thumb drive option. Would it make sense to put
>> the Cassandra commit log on the USB thumb disk and use RAID0 to use
>> both 4TB disks for data (and Ubuntu 12.04)?
>>
>> Anyone know how long USB flash disks last when use for a write heavy
>> workload like this?
>>
>> Please tell me if this is a really bad idea.
>>
>> Our alternative is to use one 4TB disk for commit log and one for
>> data. Of course this will give us only half the space.
>>
>> Thanks
>> David
>>
>

--089e0122a8120456bf04eb4da8ab
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">It&#39;s conceivable that one of the faster USB 3.0 sticks=
 would be sufficient for this. I wouldn&#39;t exactly call it an &quot;ente=
rprise&quot; configuration, but it&#39;s worth considering. Keep in mind th=
at if you are comfortable using your RF for durability, you can turn off du=
rable_writes on your keyspace and not write to the commitlog at all.<br>
<br></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On =
Sat, Nov 16, 2013 at 11:05 AM, Philippe <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:watcherfr@gmail.com" target=3D"_blank">watcherfr@gmail.com</a>&gt;</sp=
an> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><p dir=3D"ltr">Hi david, we tried it two yea=
rs ago and the performance of the USB stick was so dismal we stopped.<br>
Cheers<br>
</p>
<div class=3D"gmail_quote">Le 16 nov. 2013 15:13, &quot;David Tinker&quot; =
&lt;<a href=3D"mailto:david.tinker@gmail.com" target=3D"_blank">david.tinke=
r@gmail.com</a>&gt; a =E9crit :<div><div class=3D"h5"><br type=3D"attributi=
on"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex">

Our hosting provider has a cost effective server with 2 x 4TB disks<br>
with a 16G (or 64G) USB thumb drive option. Would it make sense to put<br>
the Cassandra commit log on the USB thumb disk and use RAID0 to use<br>
both 4TB disks for data (and Ubuntu 12.04)?<br>
<br>
Anyone know how long USB flash disks last when use for a write heavy<br>
workload like this?<br>
<br>
Please tell me if this is a really bad idea.<br>
<br>
Our alternative is to use one 4TB disk for commit log and one for<br>
data. Of course this will give us only half the space.<br>
<br>
Thanks<br>
David<br>
</blockquote></div></div></div>
</blockquote></div><br></div>

--089e0122a8120456bf04eb4da8ab--