Perl 6 - the future is here, just unevenly distributed

IRC log for #gluster, 2016-03-08

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All times shown according to UTC.

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00:13 * JoeJulian quickly goes and changes passwords after realizing that his anti-ignore included his hexchat configuration for connecting to his irc proxy - including password. oops.
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00:18 juhaj Hehe
00:19 juhaj The downside of ignoring is that there is then no backup either, so I think I'll just give unison a go again
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01:02 tyler274 anyone know why rebalance is incredibly slow
01:02 tyler274 like 30GB in 12 hours slow
01:03 JoeJulian I'm not sure what would be credible.
01:06 tyler274 https://www.irccloud.com/pastebin/K1Q9eMFG/
01:06 glusterbot Title: Pastebin | IRCCloud (at www.irccloud.com)
01:07 tyler274 would anything in that setup be especially weird
01:08 tyler274 goal is to have 2x replication across 3 nodes while still having a guard against split brain
01:08 JoeJulian Just wierd that you'd obfuscate a uuid. ;)
01:09 JoeJulian weird even... (I just cannot spell today! Argh!)
01:11 tyler274 i was prepared to take a performance hit vs lizardfs but an order of magnitude is a bit much
01:11 tyler274 copying over a movie file was maxing at 150KB/s
01:12 tyler274 compared to 25MB/s (think that's capped by the external drive's speed) on lizard
01:12 JoeJulian 3.7.8?
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01:13 tyler274 yep
01:13 JoeJulian one sec, there's a known issue
01:13 tyler274 oddly enough the plain 3x distributed replicate is hitting ~3MB/s
01:15 JoeJulian Try "gluster volume set $volume performance.write-behind Off"
01:15 JoeJulian That should bring your speed back to normal. Should be able to change it back when 3.7.9 is released.
01:16 tyler274 if you don't mind linking what was the technical reason behind the issue?
01:16 JoeJulian bug 1309462
01:16 glusterbot Bug https://bugzilla.redhat.com:443/show_bug.cgi?id=1309462 low, unspecified, ---, ravishankar, ASSIGNED , Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance.  Fresh install of 3.7.8 also has low write performance
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01:19 tyler274 much better
01:20 tyler274 matching lizard now
01:23 tyler274 thank you
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01:38 tessier huh....just discovered something interesting with respect to my gluster problem.
01:38 bumpy^ Upgraded to version 3.7.8, after that I just noticed my logs are over 3gb in size, with this: W [dict.c:429:dict_set] (-->/usr/lib/x86_64-linux-gnu/glusterfs/3.7.8/xlator/cluster/replicate.so(afr_lookup_xattr_req_prepare+0xb0) [0x7fcfa7cefbc0] -->/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(dict_set_str+0x2c) [0x7fcfacfc8b1c] -->/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(dict_set+0x96) [0x7fcfacfc69f6] ) 0-dict: !this || !value fo
01:38 glusterbot bumpy^: ('s karma is now -124
01:38 tessier I cannot gluster peer probe from the client. I *can* peer probe from the brick server to the client. But then the gluster peer status between these two says "State: Peer Rejected (Connected)"
01:41 tessier I followed the steps on:
01:41 tessier https://www.gluster.org/community/documentation/index.php/Resolving_Peer_Rejected
01:41 tessier And now I can successfully probe peers from the client!
01:42 tessier "Try the whole procedure a couple more times if it doesn't work right away. "
01:42 tessier Doesn't this suggest that they don't really know what causes this?
01:43 bumpy^ hehe
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01:59 tessier Ugh....that didn't really fix the problem.
02:00 tessier I can't mount.
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06:28 tyler274 @JoeJulian thought it was fixed but it wasn't
06:28 tyler274 still writing less than 1MB/s to the cluster :/
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06:34 tyler274 compared to ~10MB/s on the plain 3x distributed replicate
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06:45 tyler274 performance.write-behind: Off for both of them
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07:02 tyler274 redoing the volume is now topping at 13MB/s writes
07:02 tyler274 so not absolutely terrible
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07:20 tyler274 loading the data from 2 separate drives in 2 rsync processes seems to be faster, getting ~24MB/s total
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07:27 tyler274 huh, stopping the transfers, umounting the volume, and remounting with -o acl seems to have killed performance
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07:46 tyler274 like less than 2MB/s total
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08:17 xiu hi :) yesterday I upgraded a cluster of 3.3 to 3.6 and the whole operation went smooth, kudos! :) The only problem I had was this: https://serverfault.com/questions/664970/glusterfs-failed-to-get-the-volume-file-from-server when upgrading from 3.5 to 3.6, I can't find a note on this in the upgrade notes (https://gluster.readthedocs.org/en/latest/Upgrade-Guide/upgrade_to_3.6/), is it possible to add it?
08:17 glusterbot Title: mount - glusterfs: failed to get the 'volume file' from server - Server Fault (at serverfault.com)
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10:32 ggarg #REMINDER: Gluster Community Bug Triage meeting at 12:00 UTC ( start ~in 90 minutes)
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13:02 davis__ I'm having gluster clients report "Transport Endpoint is not connected" since I removed replica bricks from gluster volumes, and servers from pools. The remaining gluster servers are reporting "E [mem-pool.c:417:mem_get0] (-->/usr/lib64/libglusterfs.so.0(+0x898df) [0x7ff6dab2f8df] -->/usr/lib64/libglusterfs.so.0(_gf_msg+0x813) [0x7ff6daacd663] -->/usr/lib64/libglusterfs.so.0(mem_get0+0x93) [0x7ff6dab02c33] ) 0-mem-pool: invalid argument [Invalid argument]"
13:02 glusterbot davis__: ('s karma is now -125
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13:04 davis__ I've rebooted servers and clients, and I'm seriously wondering about what to do next. I'm wondering whether to delete and re-create the volumes (as long as I can preserve existing data!)
13:04 davis__ This is on RHGS 3.1 Update 2, FWIW
13:21 ndevos davis__: if you are running RHGS, you should open a support case with Red Hat, we're the upstream Gluster community here :)
13:21 davis__ ndevos: Yeah.... Already done that, thanks (sorry, didn't say). Was hoping I could get ahead of the game with regards to deleting and re-creating without blowing away my data :-)
13:22 davis__ Just because I'm pretty sure what RHN will come back with...
13:23 ndevos davis__: its difficult to say anything about it, rhgs includes many backported patches on top of an older gluster version...
13:25 ndevos davis__: maybe you have some details in the logs on the gluster-client where the "Transport Endpoint is not connected" happened, that could give some hints
13:25 davis__ Ok, fair enough - thanks for reading. I kind of thought that you guys wouldn't want to take responsibility for RH's "additions".
13:25 ndevos you can ,,(paste) the log somewhere
13:25 glusterbot For a simple way to paste output, install netcat (if it's not already) and pipe your output like: | nc termbin.com 9999
13:26 davis__ ndevos, Thanks. Worth a check. I'm currently disappearing down a rabbit hole of client versions... Might pop my head back up if there's any grey matter left inside....
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14:02 Ulrar So I have a client mounting a volume with the fuse client. I powered off the server it was using for a test, and I got a endpoint not connected error. So I changed my fstab line to use "backup-volfile-servers", and after a good freez this time the volume is accessible again after powering off the node, but how do I check what server it is using now ?
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15:34 g3kk0 what's the best way to access a gluster volume from the server locally?
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15:35 JoeJulian Write your application to use libgfapi.
15:35 g3kk0 I know making changes directly to the mounted brick is a nono
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15:35 JoeJulian That's the *best* way, but just mounting the volume using the fuse client is sufficient.
15:35 g3kk0 do I need to install the gluster client on the server and mount it via that
15:36 JoeJulian yep
15:36 g3kk0 ok
15:36 JoeJulian Just like the hair club for men.
15:36 g3kk0 thanks very much for the help
15:36 JoeJulian "I'm also a client."
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20:36 brian I’m having an issue, none of my gluster bricks are coming online. How can I figure out why and fix it?
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20:48 JoeJulian check the brick logs in /var/log/glusterfs/bricks
20:48 JoeJulian My guess would be that your servers cannot establish quorum, if you have more than 2.
20:49 JoeJulian Also, brian, check peer status.
20:49 brian I had to stop the volume and start it
20:50 JoeJulian I thought "none" of your bricks were online.
20:51 JoeJulian If it was just "some", you probably could have just "start $volname force"
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22:46 gbox Hi how widely used is nfs export?  The new docs focus on ganesha but that seems to function independently of the built-in nfs; is that true?
22:52 JoeJulian gbox: it is true.
22:52 JoeJulian ganesha is more feature rich.
22:54 gbox @JoeJulian: Hi, thanks.  Will the built-in legacy be replaced by ganesha?  Ganesha setup disables NetworkManager.  Do most gluster installs disable NetworkManager?
22:54 gbox I think I'll stick with the fuse client for now.
22:55 JoeJulian Most admins diasable NetworkManager
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22:56 JoeJulian NetworkManager is really only useful for a device, like a laptop, where things change a lot. With a modern distro, you'd configure your network with systemd-networkd.
22:57 gbox @JoeJulian: Ha the way you stated that is great--hilarious.  Yes that's good advice.
22:57 gbox OK so systemd-networkd is only in Centos/RHEL 7.2 I believe
22:58 JoeJulian And debian, and Arch, and Fedora
22:59 gbox @JoeJulian: Yes understood.  But the standard network service in Centos/RHEL is not networkd but something simpler (based on the sysconfig/network-scripts I think).  Regardless I'll get rid of NM.
23:00 JoeJulian Yeah, I've done it the old way countless times as long as I can remember. Probably since Red Hat 2.0.
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23:03 gbox @JoeJulian: Ironically I could only get ethernet bonding working through NM on RHEL7.  Bonding is great with gluster btw!  But I think I can switch over.
23:05 gbox Is there any advantage in ganesha/nfs over the fuse client (in gluster 7.3)?
23:06 gbox Particularly performance
23:07 gbox The CTDB/Samba integration in ganesha seems very useful but that's a wishlist item for me
23:08 gbox 3.7
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23:09 gbox By 7.3 I'm hoping for telepathic integration
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23:19 JoeJulian gbox: Could potentially be some performance improvements over fuse, with the usual caveats when the kernel is caching something it knows nothing about.
23:19 JoeJulian If you can write your application to use libgfapi, that's the best performance.
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23:48 kattamm are there any tasks gluster does daily at regular intervals?
23:49 kattamm we are seeing a large number of reads on the disks everydat at a particular time
23:49 kattamm ie. on the bricks
23:49 gbox @JoeJulian: Thanks that makes sense.  Interesting point about libgfapi.  I have a python app that libgfapi might work with.  Does anyone on this channel discuss libgfapi with python?
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