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From: Jonathan Ellis <jbellis@gmail.com>
Date: Tue, 25 May 2010 00:01:50 -0500
Message-ID: <AANLkTileiLrZpHK6TQuokmTfPCypEvj6q88oSiRqbi1j@mail.gmail.com>
Subject: Re: Ideal configuration for given hardware
To: user@cassandra.apache.org
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yes, I would do raid1 on 2 commitlog disks and raid10 on the 6
remaining for OS + data

On Mon, May 24, 2010 at 2:27 PM, Aaron McCurry <amccurry@gmail.com> wrote:
> Thanks, a lot! =A0So for RAID 10, is the thought that the node can surviv=
e a
> single disk failure and keep going until a normal maintain cycle? =A0Also=
 are
> you saying that you would configure a single RAID 10 for the whole box? =
=A0OS
> included? =A0I have 8 x 500 Gig drives, so that would leave me with 2T pe=
r
> box, which I think is fine. =A0But I do have one question, in this
> configuration would commit log writing and data directory
> compaction=A0interfere=A0with one another? =A0Just based on what I read, =
it seems
> as though you want at least disks/partitions, one for commit log and one =
for
> data. =A0Thanks again for the feedback!
> Aaron
>
>
> On Mon, May 24, 2010 at 3:12 PM, Ian Soboroff <isoboroff@gmail.com> wrote=
:
>>
>> My data disks on two of my nodes are RAID-5, just because of
>> circumstances.=A0 My other nodes are JBOD.=A0 I don't notice any real
>> difference, but I haven't strongly benched it.
>> Ian
>>
>> On Mon, May 24, 2010 at 2:45 PM, Jonathan Ellis <jbellis@gmail.com> wrot=
e:
>>>
>>> I can think of at least 2 clusters running 32GB boxes with single
>>> Cassandra processes on each. =A0(16 seems to be more common.) =A0At 64 =
I
>>> would seriously consider multiple processes per machine. =A0You'd want
>>> to configure a Snitch such that same-machine boxes were considered the
>>> same rack, there is no separate closeness level of same machine.
>>>
>>> At 32 I think you're fine with one process. =A0Watch for latency spikes
>>> and see how it goes.
>>>
>>> I would run raid 10 on the data disks if you can afford giving up the
>>> space, otherwise raid0. =A0I don't know that anyone's tested raid5.
>>>
>>> On Sun, May 23, 2010 at 3:30 PM, Aaron McCurry <amccurry@gmail.com>
>>> wrote:
>>> > I am planning on setting up a Cassandra cluster on a small 16 node
>>> > cluster
>>> > (possibly 32 way). =A0Each machine has 8 cores 32 Gig of ram and 8 hd=
s.
>>> > =A0My
>>> > first thought is to setup one of those hds for the commit log, 6 for
>>> > data
>>> > and leave one for the OS. =A0However I do have a concern about best
>>> > utilizing
>>> > my memory, should I run a larger heap? =A0Should I run several cassan=
dra
>>> > processes on the same box?
>>> > My concern about the larger heap is because GC's typically get slower=
.
>>> > =A0And
>>> > if I run several procs, does cassandra realize that it's the same box
>>> > for
>>> > replication=A0purposes?
>>> > I do have other hd conf options, hardware RAID 0,1,or 5.
>>> > Just looking for some general configuration options as well as some
>>> > real
>>> > world successes with similarly sized hardware. =A0Thanks!
>>> > Aaron
>>>
>>>
>>>
>>> --
>>> Jonathan Ellis
>>> Project Chair, Apache Cassandra
>>> co-founder of Riptano, the source for professional Cassandra support
>>> http://riptano.com
>>
>
>


--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com