Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2015-11-29

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14:15 dorvan hi all
14:16 dorvan i'm new to gluster...
14:16 Jmainguy welcome
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14:19 dorvan thanks...
14:19 dorvan I'm reading the documentation, and i see many reference to xfs, it's a implicit suggestion, ora i can use other fs?
14:21 dorvan what about best practice especially related to encryption on samba exported volume in a redundant 2 nodes configuration?
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14:39 dorvan Jmainguy: I see terminology to use in a glustefs env, before gluster i've used drbd/ocfs and zfs for small redundant clusters... now i want to setup a replicated 2 nodes only cluster to provision samba and vm
14:39 dorvan i hav 2 server with a mixed conf of hd equal on both machines
14:39 dorvan have*
14:40 dorvan (2x256ssd + 2x1tb ssd + 2x2tb hdd ) on each machine
14:41 dorvan I have two requirements, speed on lot of small files dirs with xattrs/acl and encryption
14:41 Jmainguy dorvan: yeah I have never tried anything other than xfs, I know xfs is at the very least the recomended
14:42 Jmainguy and it needs to have inode size of 512
14:42 dorvan on any device?
14:42 Jmainguy yeah, on the backing drives
14:43 Jmainguy and then the servers that mount it from the cluster, mount it as nfs/cif/glusterfs
14:43 Jmainguy depending on the driver you choose
14:43 Jmainguy so your vm's can mount the glsuter stuff as samba
14:44 dorvan in my situation servers are the storage... for me are simple roles on same machines...
14:44 Jmainguy sure
14:44 Jmainguy afk for bfast real quick
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14:44 dorvan srv1 is storage1 and srv2 is  storage 2
14:45 dorvan have sense using glusterfs also for getting local raid1 ?
14:45 dorvan i read that is a "per directory" logic
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15:02 Jmainguy dorvan: so you can make gluster have a redundant array
15:02 Jmainguy which is basically raid 1
15:02 Jmainguy make partition of storage on srv1, and partiton on srv2, and turn them into bricks, and add them to a volume
15:02 Jmainguy now you have a redundant volume, and if you wanted a non redundant volume as well
15:03 Jmainguy just make another partition/brick on each again
15:03 Jmainguy and add those to a diff volume
15:03 Jmainguy and in a volume, you can set quotas per dir on those volumes
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15:21 dorvan yes i'm speaking on the same machine...
15:22 dorvan brick1 (srv1) - brick2 (srv2) + brick1r (srv1) - brick2r (srv2)
15:23 dorvan bricks on same machine will be the synced copy
15:23 dorvan i'm looking on Gluster on ZFS as backing fs
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16:08 Jmainguy dorvan: https://www.gluster.org/community/d​ocumentation/index.php/GlusterOnZFS
16:08 Jmainguy dorvan: looks as its possible
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17:16 Park2 hi,  I'm not intended to bug the list,  but I can't figure it out how to resolve it after digging around more than a whole day:
17:17 Park2 hi,  I'm stressing file writing to gluster,  and monitoring the network traffic with iftop,  the odd thing I see is:   traffic from client to each storage node is lower than (less than half) the traffic from storage node to client,  I'm confused,  anyone knows how it could be like this?
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20:07 JoeJulian Park2: What are you using to do these writes?
20:07 JoeJulian And what type of volume?
20:09 Park2 JoeJulian, I have a http server to accept file uploading,  and tsung to stress to http server,  the volume type is distributed + replication
20:12 JoeJulian Ok, no idea then what the code actually does that supposedly appends. With a replicated volume, a write append should be almost no incoming data (some rpc packets) and double the size of the write as the client writes to two replica (assuming replica 2).
20:15 Park2 It's not simply appending,  actually with some f.seek() involked,  does it matters?
20:15 JoeJulian I would validate what your writing application is actually doing (strace) and maybe look at the traffic with wireshark.
20:15 JoeJulian shouldn't matter, no.
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20:17 Park2 I strace'ed glusterfs process,  lots of and frequent readv in the output.
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20:20 Park2 tryied with disabling performance.read-ahead and performance.read-ahead-after-open,  but no difference.
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20:22 JoeJulian I meant strace the fops coming from the application. Is the application trying to read?
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20:26 Park2 it reads some,  but definitely not that much.   I created a merged file format, and may seek to the merged file top, reading some bits from the headers for things like flags,  and seek to the end to writes the new file data as a block, sets the file size in the header,  etc, things like this.  I also straced my application,  no unexpected reading found
20:28 JoeJulian hmm, not you've got my interest.
20:28 JoeJulian Why are you making me think on a weekend? I'm not paid to think today! ;)
20:28 JoeJulian You could enable trace logs to see what the client is actually doing.
20:30 Park2 I'm sorry, :)
20:31 Park2 remouting the client with TRACE log level...
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20:46 Park2 https://pastebin.mozilla.org/8853398  tons of logs,  this is part of it,  no interesting clue looks to me though ( with my limited knowledge on gluster)
20:47 glusterbot Title: Mozilla Pastebin - collaborative debugging tool (at pastebin.mozilla.org)
20:48 JoeJulian I see no readv
21:04 Park2 really odd,  I looked through the whole trace log,  no clue,  but I believe iftop is not liar.
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21:07 JoeJulian wireshark
21:08 JoeJulian it'll even decode gluster packets.
21:08 Park2 I'm going to try,  thanks JoeJulian
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21:24 Topic for #gluster is now Gluster Community - http://gluster.org | Patches - http://review.gluster.org/ | Developers go to #gluster-dev | Channel Logs - https://botbot.me/freenode/gluster/ & http://irclog.perlgeek.de/gluster/
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22:41 Topic for #gluster is now Gluster Community - http://gluster.org | Patches - http://review.gluster.org/ | Developers go to #gluster-dev | Channel Logs - https://botbot.me/freenode/gluster/ & http://irclog.perlgeek.de/gluster/
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