I think that I can rule out network as I have multiple volumes on the same nodes and not all volumes are affected. Additionally, access via SMB using samba-vfs-glusterfs is not affected, even on the same volumes. This is seemingly only affecting the FUSE clients.
From: Davide Obbi <davide.obbi@xxxxxxxxxxx>
Sent: Sunday, January 6, 2019 12:26 PM
To: Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx>
Cc: Matt Waymack <mwaymack@xxxxxxxxx>; gluster-users@xxxxxxxxxxx List <gluster-users@xxxxxxxxxxx>
Subject: Re: [External] Re: Input/output error on FUSE log
Hi,
i would start doing some checks like: "(Input/output error)" seems returned by the operating system, this happens for instance trying to access a file system which is on a device not available so i would check the network connectivity between the client to servers and server to server during the reported time.
Regards
Davide
On Sun, Jan 6, 2019 at 3:32 AM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:
On Sun, Jan 6, 2019 at 7:58 AM Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:
On Sun, Jan 6, 2019 at 4:19 AM Matt Waymack <mwaymack@xxxxxxxxx> wrote:
Hi all,
I'm having a problem writing to our volume. When writing files larger than about 2GB, I get an intermittent issue where the write will fail and return Input/Output error. This is also shown in the FUSE log of the client (this is affecting all clients). A snip of a client log is below:
[2019-01-05 22:39:44.581371] W [fuse-bridge.c:2474:fuse_writev_cbk] 0-glusterfs-fuse: 51040978: WRITE => -1 gfid=82a0b5c4-7ef3-43c2-ad86-41e16673d7c2 fd=0x7f949839a368 (Input/output error)
[2019-01-05 22:39:44.598392] W [fuse-bridge.c:1441:fuse_err_cbk] 0-glusterfs-fuse: 51040979: FLUSH() ERR => -1 (Input/output error)
[2019-01-05 22:39:47.420920] W [fuse-bridge.c:2474:fuse_writev_cbk] 0-glusterfs-fuse: 51041266: WRITE => -1 gfid=0e8e1e13-97a5-478a-bc58-e81ddf3698a3 fd=0x7f949809b7f8 (Input/output error)
[2019-01-05 22:39:47.433377] W [fuse-bridge.c:1441:fuse_err_cbk] 0-glusterfs-fuse: 51041267: FLUSH() ERR => -1 (Input/output error)
[2019-01-05 22:39:50.441531] W [fuse-bridge.c:2474:fuse_writev_cbk] 0-glusterfs-fuse: 51041548: WRITE => -1 gfid=0e8e1e13-97a5-478a-bc58-e81ddf3698a3 fd=0x7f949839a368 (Input/output error)
[2019-01-05 22:39:50.451914] W [fuse-bridge.c:1441:fuse_err_cbk] 0-glusterfs-fuse: 51041549: FLUSH() ERR => -1 (Input/output error)
The message "W [MSGID: 109011] [dht-layout.c:163:dht_layout_search] 0-gv1-dht: no subvolume for hash (value) = 1311504267" repeated 1721 times between [2019-01-05 22:39:33.906241] and [2019-01-05 22:39:44.598371]
The message "E [MSGID: 101046] [dht-common.c:1502:dht_lookup_dir_cbk] 0-gv1-dht: dict is null" repeated 1714 times between [2019-01-05 22:39:33.925981] and [2019-01-05 22:39:50.451862]
The message "W [MSGID: 109011] [dht-layout.c:163:dht_layout_search] 0-gv1-dht: no subvolume for hash (value) = 1137142622" repeated 1707 times between [2019-01-05 22:39:39.636552] and [2019-01-05 22:39:50.451895]
This looks to be a DHT issue. Some questions:
* Are all subvolumes of DHT up and client is connected to them? Particularly the subvolume which contains the file in question.
* Can you get all extended attributes of parent directory of the file from all bricks?
* set diagnostics.client-log-level to TRACE, capture these errors again and attach the client log file.
I spoke a bit early. dht_writev doesn't search hashed subvolume as its already been looked up in lookup. So, these msgs looks to be of a different issue - not writev failure.
This is intermittent for most files, but eventually if a file is large enough it will not write. The workflow is SFTP tot he client which then writes to the volume over FUSE. When files get to a certain point,w e can no longer write to them. The file sizes are different as well, so it's not like they all get to the same size and just stop either. I've ruled out a free space issue, our files at their largest are only a few hundred GB and we have tens of terrabytes free on each brick. We are also sharding at 1GB.
I'm not sure where to go from here as the error seems vague and I can only see it on the client log. I'm not seeing these errors on the nodes themselves. This is also seen if I mount the volume via FUSE on any of the nodes as well and it is only reflected in the FUSE log.
Here is the volume info:
Volume Name: gv1
Type: Distributed-Replicate
Volume ID: 1472cc78-e2a0-4c3f-9571-dab840239b3c
Status: Started
Snapshot Count: 0
Number of Bricks: 8 x (2 + 1) = 24
Transport-type: tcp
Bricks:
Brick1: tpc-glus4:/exp/b1/gv1
Brick2: tpc-glus2:/exp/b1/gv1
Brick3: tpc-arbiter1:/exp/b1/gv1 (arbiter)
Brick4: tpc-glus2:/exp/b2/gv1
Brick5: tpc-glus4:/exp/b2/gv1
Brick6: tpc-arbiter1:/exp/b2/gv1 (arbiter)
Brick7: tpc-glus4:/exp/b3/gv1
Brick8: tpc-glus2:/exp/b3/gv1
Brick9: tpc-arbiter1:/exp/b3/gv1 (arbiter)
Brick10: tpc-glus4:/exp/b4/gv1
Brick11: tpc-glus2:/exp/b4/gv1
Brick12: tpc-arbiter1:/exp/b4/gv1 (arbiter)
Brick13: tpc-glus1:/exp/b5/gv1
Brick14: tpc-glus3:/exp/b5/gv1
Brick15: tpc-arbiter2:/exp/b5/gv1 (arbiter)
Brick16: tpc-glus1:/exp/b6/gv1
Brick17: tpc-glus3:/exp/b6/gv1
Brick18: tpc-arbiter2:/exp/b6/gv1 (arbiter)
Brick19: tpc-glus1:/exp/b7/gv1
Brick20: tpc-glus3:/exp/b7/gv1
Brick21: tpc-arbiter2:/exp/b7/gv1 (arbiter)
Brick22: tpc-glus1:/exp/b8/gv1
Brick23: tpc-glus3:/exp/b8/gv1
Brick24: tpc-arbiter2:/exp/b8/gv1 (arbiter)
Options Reconfigured:
performance.cache-samba-metadata: on
performance.cache-invalidation: off
features.shard-block-size: 1000MB
features.shard: on
transport.address-family: inet
nfs.disable: on
cluster.lookup-optimize: on
I'm a bit stumped on this, any help is appreciated. Thank you!
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--Davide Obbi
Senior System Administrator
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