[Gluster-users] Small Tests in EC2 failing...

Adam Lindsay adam at nextfeature.com
Tue Nov 16 10:32:17 UTC 2010

I guess this could be it. Find it odd that I have done the install
from scratch and had the same problem show up almost immediately on
all three. This bug suggests that its only 1 in 100. I was seeing more
like 3 in 3, leading me to believe it was something else.

On Mon, Nov 15, 2010 at 4:05 AM, Craig Carl <craig at gluster.com> wrote:
> Adam -
>    You may be experiencing bug #1053,
> http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1053.
>      Gluster 3.1.1qa6 is available here -
> http://download.gluster.com/pub/gluster/glusterfs/qa-releases/glusterfs-3.1.1qa6.tar.gz,
> please try moving to this version on a 64-bit platform.
> Thanks,
> Craig
> -->
> Craig Carl
> Gluster, Inc.
> Cell - (408) 829-9953 (California, USA)
> Gtalk - craig.carl at gmail.com
> ________________________________
> From: "Adam Lindsay" <adam at nextfeature.com>
> To: gluster-users at gluster.org
> Sent: Sunday, November 14, 2010 10:03:21 AM
> Subject: [Gluster-users] Small Tests in EC2 failing...
> A little background. I have gone through a lot of GlusterFS
> documentation and outdated tutorials on installing and setting up a
> standard 2 server replication with them acting as clients as well. I
> am using Ubuntu 10.04 and GlusterFS 3.1. My goals are not that
> ambitious. I don't have terabytes of data and only need the most
> modest of replication, to the point where I have strongly considered
> rsync or unison. GlusterFS seems to be the hotness so I figured I
> would give it a try. Initially I spawned 2 m1.micro and got everything
> installed and running. I setup Gluster using the command line tool.
> The commands that are relevant are below. I do have a bit of questions
> regarding this, which documentation isn't very clear on.
> # On Server 1
> gluster peer probe <server2 ip>
> gluster volume create websites replica 2 transport tcp <server1
> ip>:/exp1 <server2 ip>:/exp2
> gluster volume start websites
> mkdir -p /mnt/websites
> modprobe fuse
> mount -t glusterfs <server1 ip>:/websites /mnt/websites
> As you can see this is extremely straight forward. What is weird is
> when I start down the path of only simple tests like creating a text
> file in the /mnt/websites mount and saving, it doesn't take long for
> the /mnt/websites on both servers to not match. Whats odd is that the
> /exp1 and /exp2 directories match nearly instantly. I figure the
> problem lies between the client and the volume. I have tried all kinds
> of configurations. Mounting both clients on each server to the server1
> ip, also their own local IP, I even tried crossing them. Finally I
> figured, maybe the m1.micro are just too small. So I redid this with
> m1.small's. Yes these are 32bit, so I had to compile the code to
> install. This went smoothly, and yet same results.
> So my questions:
> 1) Do I have to use clients or can I just read/write to the /exp1 and
> /exp2 directories directly?
> 2) Am I expecting too much from an m1.micro or even m1.small? Again
> this was a simple text file and only a single one. Kinda surprised it
> would take more CPU just to do that much.
> 3) I feel this is probably a configuration/optimization issue. It
> seems as though the replication to the /exp1 and /exp2 directories
> happen quickly and are ready to go, but something with the default
> configuration to the client isn't good.
> 4) Could it be the way I am connecting the clients? Do they always
> point to server1 ip? or to localhost?
> Before its recommended, m1.large and a 4 server config is probably out
> of the budget. If this is what it takes tough than I will simply need
> to search for another solution. DRBD has come up as a potential for
> what I want, but seems as though it might suffer from split brain on
> EC2. Again though given the very very simple test, I would expect this
> to work even if the instances are a bit underpowered for what most
> people use on this list. Any advice or help is greatly appreciated.
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Adam Lindsay
Next Feature
(585) 969-6600
adam at nextfeature.com

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