Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2016-05-09

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07:01 djmentos hello all
07:01 djmentos is it possible to use gluster replica even if one of the nodes is broken? because I tried to create host <> host mirror, but can not access mount point if on of them is failed
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07:11 rafi djmentos: it should be able to access
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07:12 djmentos even if I will umount one of them?
07:12 rafi djmentos: can you paste volume status output, gluster v info and errors from mount logs
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07:13 djmentos I have just rm -rf'd configuration because of another test, but will try to restore in few minutes
07:13 rafi djmentos: okey, no hurries
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10:13 spoof I have a QQ regarding a gluster concept I'm not quite understanding. Is there anyone here who can volunteer 2min of their time to explain it to me?
10:13 post-factum spoof: just ask, and then we will see :)
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10:16 spoof I work as a Devops engineer, currently building a local (docker based) cloud infrastructure for my company using open source components and have decided to use Glusterfs for certain elements of my storage solution. What I'm not quite understanding is the gluster volume concept, and in particular how I should view it. Do I create one huge volume used company wide for absolutely everything, or do I create fine grained volumes for diffe
10:16 spoof What I'm failing to understand is, at what point to i create NEW volumes?
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10:17 post-factum spoof: i'd go with new volume for new set of data
10:17 post-factum spoof: like mail — one volume, web — another volume, samba storage crap — third volume etc
10:18 spoof those could equally be handled by directories?
10:18 spoof why would i choose volumes over directories?
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10:21 spoof Correct me if I'm wrong but my understanding is that best practice is, one physical disk (or array) -> One brick -> One Brick -> One volume (If this is wrong, what you're saying would make a hell of a lot more sense)
10:23 ira spoof: In general, if you ask: "Should I build a giant company wide X..." The answer "Probably not" should cross your mind. :)
10:23 spoof I think my real question is - can i reuse the same bricks, when defining multiple volumes?
10:24 ira Even AWS and friends have failure domains, etc...
10:24 spoof @ira - yes i understand, but I'm handling that seperation at a different level of abstraction
10:24 spoof at the container level
10:25 ira How big are you planning?
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10:26 spoof it's a dev company, the "cloud" will prob be at most 20 servers and the "distributed storage" pool is going to be applied to CI/CD and related functions
10:26 spoof It's a dev shop
10:26 spoof I should prob have said that
10:26 spoof The "cloud" is primarily used loally by developers to run various testing workloads etc
10:26 spoof *locally
10:27 post-factum spoof: using subfolders for bricks is ok
10:27 ira Ok... So what do you need a distributed filesystem for? :)
10:27 spoof I have three storage options (SAN, In-Memory, Local-disk and Glusterfs) depending on the lifecycle of the container and the performance criteria
10:28 ira 4?
10:28 spoof when containers move between hosts, their data needs to persist in a "shared" location (in some cases)
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10:29 ira Ok.... Do you know what type of files things will be writing?  What performance they need?
10:29 spoof where my container runs should not be something i worry about, so the data needs to be either in a "shared" filesystem, or the data needs to migrate to the new host, or (in most cases) - the data doesn't need to move
10:31 spoof okay let me give you a concrete example
10:32 spoof I run a production Jenkins instance and a local Git Repo. I schedule them in my cloud, they persist data to a shared storage location, the server dies, the containers are automatically rescheduled on a different host, and they continue where they left off with their data being accessible from the glusterfs filesystem.
10:33 spoof that's my goal
10:33 spoof if that makes sense
10:33 spoof When performance becomes a concern, I have other avenues to solve those problems.
10:33 ira Not really?
10:34 ira Small file performance with Gluster can be pretty bad.
10:35 spoof I mean, I'd run those workloads in-memory, on the local file system or on the SAN
10:35 ira ... until they need to replicate.
10:35 ira ... Most problems like yours, you solve with application level replication.
10:36 ira But that's another day's talk :-).  And that's why you are getting confusing answers.
10:36 ira But for what you are trying... Directories will probably be "OK" because security and things won't be big issues.
10:37 spoof thank you for your input thusfar.
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10:37 ira No problem, I did devops before they called it that.
10:37 ira ;)
10:38 ira And lunch is calling me. :)
10:38 spoof haha- enjoy
10:38 spoof one last question
10:38 spoof :P
10:38 ira Sure./
10:38 spoof where would you say glusterfs is going to actually give me a performance benefit over SAN or local disk?
10:39 spoof *assuming my network isn't a bottlenect
10:39 ira "It depends."
10:39 spoof thought so...
10:39 ira Network can always be a bottleneck.
10:39 spoof haha
10:40 ira But, I'd benchmark things, and understand the architecture of the things you are architecting on top of.  I'd also play with deploying it, etc... so you cna figure out what best practices should be.  They aren't always obvious.
10:40 ira (And I'd say that for any storage solution... or product in general.)
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10:41 spoof if i use 2 bricks in a distributed, replicated volume, can i create another volume using those same bricks?
10:42 spoof because that is not clear to me
10:42 ira no.  But best practice is to always make the brick in a sub directory.  There you "can" but it makes capacity management difficult.
10:42 ira My bricks are often /bricka/foo /bricka/bar for volume foo and bar.
10:43 ira (On my test rigs.)
10:43 spoof okay, that makes sense
10:43 ira That way if I have problems with the brick... I'm not stuck with destroying the filesystem a simple rm -rf works.
10:44 spoof cool, thanks
10:44 spoof I'll follow that for now....
10:44 ira I learned that the hard way ;).  There's many such lessons, of which I've probably internalized, which you'll want to learn... Play with the tool you choose.
10:44 ira :)
10:44 ira That's my biggest piece of advice.
10:44 ira And don't make your teammates wait for lunch. :)  Catch ya 'round.
10:45 spoof eish - I'm at the point of going LIVE with things....and I had no intention of becoming a glusterfs filesystem expert.....it just seemed like the tool that solved my problem at hand
10:45 spoof x
10:47 ira spoof: You should be an expert in any tool you're going to underpin a solution with.  :)
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12:13 hchiramm anoopcs, ping
12:13 glusterbot hchiramm: Please don't naked ping. http://blogs.gnome.org/mark​mc/2014/02/20/naked-pings/
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12:39 anoopcs hchiramm, pong
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20:29 Scotch anyone ever have issues with gluster client not seeing certain directories in a volume (even though they exist on physical drives)?
20:29 Scotch this is on 3.7.11
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22:55 davpostpunk hi, anyone can help me
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