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Date: Wed, 25 Feb 2015 10:16:29 -0600
Message-ID: 
 <CAKmMYa_xn5i2D1rYZ92vX7DJcwhWx0bVvCpAmHgL2koS0MXSig@mail.gmail.com>
Subject: Re: Possible problem with disk latency
From: Nate McCall <nate@thelastpickle.com>
To: Cassandra Users <user@cassandra.apache.org>
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>
> If You could be so kind and validate above and give me an answer is my
> disk are real problems or not? And give me a tip what should I do with
> above cluster? Maybe I have misconfiguration?
>
>
>
You disks are effectively idle. What consistency level are you using for
reads and writes?

Actually, 'await' is sort of weirdly high for idle SSDs. Check your
interrupt mappings (cat /proc/interrupts) and make sure the interrupts are
not being stacked on a single CPU.

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><div class=3D"gmail_quote">=
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><br></div><div>If You =
could be so kind and validate above and give me an answer is my disk are re=
al problems or not? And give me a tip what should I do with above cluster? =
Maybe I have misconfiguration?</div><div><br></div><div><br></div></div></b=
lockquote><div><br></div><div>You disks are effectively idle. What consiste=
ncy level are you using for reads and writes?=C2=A0</div><div><br></div><di=
v>Actually, &#39;await&#39; is sort of weirdly high for idle SSDs. Check yo=
ur interrupt mappings (cat /proc/interrupts) and make sure the interrupts a=
re not being stacked on a single CPU.=C2=A0</div><div><br></div><div><br></=
div></div><div class=3D"gmail_signature"></div>
</div></div>

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