Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2015-10-27

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08:09 SeerKan Hi guys
08:09 SeerKan Any chance to make a glusterfs client 3.2 work with a glusterfs server 3.7 ?
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08:11 JoeJulian no
08:12 SeerKan damn... any way to make writes to nfs mount faster ?
08:12 SeerKan already tried activating nfs.trusted-write and nfs.trusted-sync
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08:13 SeerKan takes about 5.5 seconds to write a 1.5MB file to a remote nfs share from a glusterfs 3.7... that seems too much
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08:13 JoeJulian with gluster's native nfs?
08:13 SeerKan network speeds are 100+mbs
08:14 JoeJulian latency?
08:15 SeerKan sure, but not that much... 2-3 seconds seem acceptable for the distance. A simple scp takes less than 2 s
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08:24 JoeJulian You're not doing a simple scp. You're replicating files. There's more work involved and more network round trips.
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08:27 JoeJulian Design a quantum teleportation network and cut out that latency. :)
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09:42 glafouille hello, I set replica 3 distributed glusterfs, but i/o performance are awful... (somthing like 2 MB/s)
09:42 glafouille how can I improve this?
09:43 glafouille I'm using 3.7.4
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12:10 drmomo Hi experts, I setup a three node gluster replication, but the sync time between nodes are too long (10 min) (I wrote directly from filesystem without mounting the glusterFS via this command: "mount -t glusterfs glustername:/volumename mountpoint"). How can improve the time to 1 min?
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12:21 drmomo Hi experts
12:23 atinm drmomo, why aren't you writing from mount point?
12:25 drmomo atinm: because r/w speed decrease to network limit speed
12:26 atinm drmomo, if you don't use the mount point, how are you leveraging the distributed storage here?
12:29 drmomo atinm: i r/w directly to partition "like /dev/sdc1"
12:30 drmomo and when i write into it after 10~15 min 3 node will be same
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12:48 drmomo atinm: i r/w directly to partition "like /dev/sdc1" and when i write into it after 10~15 min 3 node will be same
12:50 atinm drmomo, well I am afraid that I don't understand your use case here
12:54 drmomo i mount a pure disk into /gluster in each node and then setup glusterFS with this command: "gluster volume create gvol replica 3 transport tcp gluster1:/gluster gluster2:/gluster gluster3:/gluster"
12:55 atinm drmomo, allright
12:55 atinm then?
12:55 drmomo if i want to access these gluster from a client i must run mount -t glusterFS glustername:/volumename mountpoint
12:55 drmomo but
12:56 drmomo i want to access data from 1 of these servers directly from /gluster not the mounting point
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13:16 Leildin drmomo you're not supposed to do that
13:16 Leildin you're writing directly to the brick rather than on the volume, that's not how gluster is supposed to be used
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13:21 drmomo Leildin: you are write but when i use direct access to brick i have 500MB/s speed but when use mount point i have 56MB/s speed
13:22 bhuddah writing to /dev/null is even faster.
13:23 drmomo bhuddah: i dont want to write to /dev/null, whats your point?
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13:24 bhuddah that what you are comparing does not matter much, because one thing works and the other does not.
13:24 hagarth drmomo: what is the block size you are using for writes & how fast is your network?
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13:26 drmomo my network is 1G
13:26 drmomo it means 100 MB/s
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13:28 drmomo Block size:               4096
13:28 hagarth drmomo: clearly your writes from a client cannot go faster than your network
13:30 drmomo @hagarth: you are right, but i have some misunderstanding, why when i have 2 node in replicate gluster my speed is 117MB/s but when i add third node my speed decrease to 56MB/s ???
13:32 bhuddah maybe one of the nodes is a lot slower than the others?
13:32 drmomo and when i add fourth speed decrease to 25MB/s
13:33 bhuddah how many replicas do you create for each file?
13:33 drmomo about speed of each node, i checked and each of them has 100MB/s
13:33 drmomo 4 rep
13:33 bhuddah ok. so on one node you can saturate the network.
13:33 bhuddah with two nodes, you'll double the data on the net because you write twice.
13:34 bhuddah so then it's just 50 mb...
13:34 bhuddah same for the next node and so on
13:34 bhuddah i'd try adding more network bandwidth via a bonding device.
13:34 drmomo if its happend i haven't any complain
13:34 drmomo but now with 2 node i have 100MB/s
13:34 drmomo 3-> 50MB/s
13:34 drmomo 4-> 25MB/s
13:35 drmomo it means 1 node and 2 node make no different
13:35 bhuddah yeah. one is local, and the second one is remote, right?
13:36 drmomo oh
13:36 drmomo you right
13:36 bhuddah and i guess the bandwidth is more like 90, 60, 30 mb/s ...
13:36 drmomo i missed local one
13:37 bhuddah with some overhead...
13:37 drmomo thanks a lot
13:37 bhuddah so i certainly guess that it's the single gbit nic that's your bottleneck.
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13:38 drmomo yes my bottleneck is  network nic
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13:39 drmomo but there is no way to access with brick directly
13:39 drmomo ?
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13:40 bhuddah no. don't do that. you'll fuck it up badly.
13:40 drmomo thank you bhuddah
13:40 bhuddah enjoy :)
13:40 drmomo ;)
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22:07 tommaso hi all!
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22:16 thoht__ trying to do a snapshot and got error : napshot create: failed: Snapshot is supported only for thin provisioned LV.
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22:16 thoht__ what does that mean ? the gl volume is in a specific lv
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22:29 thoht__ oh i don t do thin pool :/
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