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On 08/15/2018 11:07 PM, Pablo Schandin
wrote:
I found another log that I wasn't aware of in
/var/log/glusterfs/brick, that is te mount log, I confused the
log files. In this file I see a lot of entries like this one:
[2018-08-15 16:41:19.568477] I
[addr.c:55:compare_addr_and_update] 0-/mnt/brick1/gv1: allowed
= "172.20.36.10", received addr = "172.20.36.11"
[2018-08-15 16:41:19.568527] I
[addr.c:55:compare_addr_and_update] 0-/mnt/brick1/gv1: allowed
= "172.20.36.11", received addr = "172.20.36.11"
[2018-08-15 16:41:19.568547] I [login.c:76:gf_auth]
0-auth/login: allowed user names:
7107ccfa-0ba1-4172-aa5a-031568927bf1
[2018-08-15 16:41:19.568564] I [MSGID: 115029]
[server-handshake.c:793:server_setvolume] 0-gv1-server:
accepted client from
physinfra-hb2.xcade.net-21091-2018/08/15-16:41:03:103872-gv1-client-0-0-0
(version: 3.1
2.6)
[2018-08-15 16:41:19.582710] I [MSGID: 115036]
[server.c:527:server_rpc_notify] 0-gv1-server: disconnecting
connection from
physinfra-hb2.xcade.net-21091-2018/08/15-16:41:03:103872-gv1-client-0-0-0
[2018-08-15 16:41:19.582830] I [MSGID: 101055]
[client_t.c:443:gf_client_unref] 0-gv1-server: Shutting down
connection
physinfra-hb2.xcade.net-21091-2018/08/15-16:41:03:103872-gv1-client-0-0-0
So I see a lot of disconnections, right? This might be why the
self healing is triggered all the time?
Not necessarily. These disconnects could also be due to the glfsheal
binary which is invoked when you run `gluster vol heal volname info`
etc and do not cause heals. It would be better to check your client
mount logs for disconnect messages like these:
[2018-08-16 03:59:32.289763] I [MSGID: 114018]
[client.c:2285:client_rpc_notify] 0-testvol-client-4: disconnected
from testvol-client-0. Client process will keep trying to connect
to glusterd until brick's port is available
If there are no disconnects and you are still seeing files
undergoing heal, then you might want to check the brick logs to see
if there are any write failures.
Thanks,
Ravi
Thanks!
Pablo.
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On 08/14/2018 09:15 AM, Pablo
Schandin wrote:
Thanks for the info!
I cannot see any logs in the mount log besides one line every
time it rotates
[2018-08-13 06:25:02.246187] I
[glusterfsd-mgmt.c:1821:mgmt_getspec_cbk] 0-glusterfs: No
change in volfile,continuing
But I did find in the glfsheal-gv1.log of the volumes some
kind of server-client connection that was disconnected and now
it connects using a different port. The block of log per each
run is kind of long so I'm copying it into a pastebin.
https://pastebin.com/bp06rrsT
Maybe this has something to do with it?
Thanks!
Pablo.
On 08/11/2018 12:19 AM, Ravishankar
N wrote:
On 08/10/2018 11:25 PM, Pablo
Schandin wrote:
Hello everyone!
I'm having some trouble with something but I'm not quite
sure of with what yet. I'm running GlusterFS 3.12.6 on
Ubuntu 16.04. I have two servers (nodes) in the cluster in
a replica mode. Each server has 2 bricks. As the servers
are KVM running several VMs, one brick has some VMs
locally defined in it and the second brick is the
replicated from the other server. It has data but not
actual writing is being done except for the replication.
Server 1
Server 2
Volume 1 (gv1): Brick 1 defined VMs (read/write)
----> Brick 1 replicated qcow2 files
Volume 2 (gv2): Brick 2 replicated qcow2 files
<----- Brick 2 defined VMs (read/write)
So, the main issue arose when I got a nagios alarm that
warned about a file listed to be healed. And then it
disappeared. I came to find out that every 5 minutes, the
self heal daemon triggers the healing and this fixes it.
But looking at the logs I have a lot of entries in the
glustershd.log file like this:
[2018-08-09 14:23:37.689403] I [MSGID:
108026] [afr-self-heal-common.c:1656:afr_log_selfheal]
0-gv1-replicate-0: Completed data selfheal on
407bd97b-e76c-4f81-8f59-7dae11507b0c. sources=[0]
sinks=1
[2018-08-09 14:44:37.933143] I [MSGID: 108026]
[afr-self-heal-common.c:1656:afr_log_selfheal]
0-gv2-replicate-0: Completed data selfheal on
73713556-5b63-4f91-b83d-d7d82fee111f. sources=[0]
sinks=1
The qcow2 files are being healed several times a day (up
to 30 in occasions). As I understand, this means that a
data heal occurred on file with gfid 407b... and 7371...
in source to sink. Local server to replica server? Is it
OK for the shd to heal files in the replicated brick that
supposedly has no writing on it besides the mirroring? How
does that work?
In AFR, for writes, there is no notion of local/remote brick.
No matter from which client you write to the volume, it gets
sent to both bricks. i.e. the replication is synchronous and
real time.
How does afr replication work? The file with gfid 7371...
is the qcow2 root disk of an owncloud server with 17GB of
data. It does not seem to be that big to be a bottleneck
of some sort, I think.
Also, I was investigating the directory tree in
brick/.glusterfs/indices and I notices that both in
xattrop and dirty I always have a file created named
xattrop-xxxxxx and dirty-xxxxxx. I read that the xattrop
file is like a parent file or handle to reference other
files created there as hardlinks with gfid name for the
shd to heal. Is the same case as the ones in the dirty
dir?
Yes, before the write, the gfid gets captured inside dirty on
all bricks. If the write is successful, it gets removed. In
addition, if the write fails on one brick, the other brick
will capture the gfid inside xattrop.
Any help will be greatly appreciated it. Thanks!
If frequent heals are triggered, it could mean there are
frequent network disconnects from the clients to the bricks as
writes happen. You can check the mount logs and see if that is
the case and investigate possible network issues.
HTH,
Ravi
Pablo.
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