Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2014-08-30

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02:22 Jay3 i have direct-io-mode enabled, and i'm doing some testing with iozone - when i change the mode to read and start reading, i'm seeing a lot of memory get consumed (10 GB files, 30 servers) - is there any way i can stop that from happening?
02:22 Jay3 or is that up to the application hitting the storage?
02:22 Jay3 iozone is using the o_direct flag
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11:58 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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12:28 glusterbot New news from newglusterbugs: [Bug 1135691] [barrier] features.barrier should be a NO_DOC option <https://bugzilla.redhat.co​m/show_bug.cgi?id=1135691>
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13:08 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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17:28 ahklerner1 does this look correct for fstab to auto mount the volume www-data        localhost:/www-data /mnt/www-data nfs defaults,_netdev,mountproto=tcp 0 0
17:30 ahklerner1 after logging in with ssh       sudo mount -t localhost:/www-data /mnt/www-data      will mount, but i am having issue auto mounting at boot
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17:41 mrEriksson ahklerner1: Which distribution are you using?
17:43 ahklerner1 os is ubuntu server 12.04, glusterfs 3.2.5
17:43 ahklerner1 i am going to try adding to /etc/rc.local
17:43 mrEriksson Ok, don't know then. But I have seen the same issue with suse and friends, since it doesn't support the _netdev mount option
17:44 mrEriksson Yeah, that's what I do on suse-hosts. I use fstab, but add noauto for each gluster mount, and then just have a script to look for gluster-filesystems in fstab and mount them later in the startup process
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17:47 ahklerner1 thank you
17:47 mrEriksson np
17:48 ahklerner1 its working with rc.local
17:49 mrEriksson Btw, why are you mounting via nfs?
17:58 ahklerner1 because when i google searched auto mounting glusterfs i got http://gluster.org/community/documen​tation/index.php/Gluster_3.2:_Automa​tically_Mounting_Volumes_Using_NFS
17:58 glusterbot Title: Gluster 3.2: Automatically Mounting Volumes Using NFS - GlusterDocumentation (at gluster.org)
17:58 ahklerner1 and im a noob
17:59 ahklerner1 which is probably why it was not automounting, because the mount command also fails when having nfs not glusterfs in it
17:59 ahklerner1 but it is working now having the mount command in the rc.local
18:01 ahklerner1 im just kinda learning about glusterfs and apache load balancing
18:05 ahklerner1 right now i have set up 3 ubuntu server vm in virtualbox, all 3 running glusterfs, the load balancer is also also running ftpd allowing ftp access to one glusterfs volume (for the web content), the two worker nodes share session data on another volume
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19:08 semiosis :O
19:08 semiosis fixing geo-rep on debuntu is haaaarrrrdddd
19:18 semiosis running into a problem where gsyncd gets installed to /usr/lib/x86_64-linux-gnu/glusterfs but then the config file generated for the geo-rep master says remote gsyncd is in /nonexistent
19:18 semiosis if i symlink /nonexistent to /usr/lib/x86_64-linux-gnu/glusterfs then the geo-rep starts OK
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19:19 semiosis but how can I get the correct libexecdir value into that config file to begin with?
19:19 * semiosis stumped
19:20 semiosis afaict the makefile is supposed to create GSYNCD_PREFIX from libexecdir, but i dont understand why that's not working (or perhaps, working in one place for the install, but not in another place for the config generator)
19:21 semiosis using glusterfs 3.5.2 on ubuntu trusty (master) and debian jessie (slave)
19:25 semiosis same thing if i go the opposite direction from jessie master to trusty slave
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20:46 elico Hey, I want to ask about the DHT hash algorithm.
20:46 elico I understood that it's using some CPU supported hash.
20:46 elico Which one? where can I find more details on the subject? Thanks, Eliezer
20:50 elico semiosis:  JoeJulian: ping *
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20:54 semiosis elico: why are you concerned about such a low-level thing?
20:54 semiosis i dont have a good answer for you either
20:55 semiosis ultimately you could read the source, in https://github.com/gluster/glusterfs​/tree/master/xlators/cluster/dht/src
20:55 glusterbot Title: glusterfs/xlators/cluster/dht/src at master · gluster/glusterfs · GitHub (at github.com)
20:55 semiosis maybe there's some articles you can google as well
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21:22 elico semiosis: I am looking at it since it's one of the things the glusterfs does different from others.
21:22 elico And Also I wanted to understand this specific topic and use glusterfs as the real world example of it.
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21:25 elico If I would have known the right algorithm I would have just looked about it in google at "algo site:edu"
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22:06 semiosis elico: the particular hash algorithm isn't really significant for how glusterfs works.  any hash alg could be used provided it has good distribution
22:07 semiosis this might be helpful: hekafs.org/index.php/2012/03/glu​sterfs-algorithms-distribution/
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22:17 elico semiosis: Thanks for the link.
22:17 elico My interest was about the CRC32 and intel SSE support for it.
22:18 elico Considering a load server the cpu support can be significant for cpu performance.
22:18 elico (as far as I can understand)
22:19 semiosis cpu is not usually the limiting factor in glusterfs deployments
22:19 semiosis and even in cases where it is cpu bound it's probably not due to filename hashing
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22:39 elico semiosis: well you are right but comparing sha512 and crc32 they do have a different CPU load as hashing algo.
22:39 elico I am going to sleep now.
22:39 elico thanks a lot !
22:40 semiosis yw
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