[Gluster-users] GFS performance under heavy traffic

Strahil Nikolov hunter86_bg at yahoo.com
Tue Jan 7 09:15:17 UTC 2020

 To find the scheduler , find all pvs of the LV is providing your storage
[root at ovirt1 ~]# df -Th /gluster_bricks/data_fast
Filesystem                                       Type  Size  Used Avail Use% Mounted on
/dev/mapper/gluster_vg_nvme-gluster_lv_data_fast xfs   100G   39G   62G  39% /gluster_bricks/data_fast

[root at ovirt1 ~]# pvs | grep gluster_vg_nvme
  /dev/mapper/vdo_nvme gluster_vg_nvme lvm2 a--  <1024.00g    0

[root at ovirt1 ~]# cat /etc/vdoconf.yml
config: !Configuration
  vdos:   vdo_nvme: !VDOService
      device: /dev/disk/by-id/nvme-ADATA_SX8200PNP_2J1120011596

[root at ovirt1 ~]# ll /dev/disk/by-id/nvme-ADATA_SX8200PNP_2J1120011596
lrwxrwxrwx. 1 root root 13 Dec 17 20:21 /dev/disk/by-id/nvme-ADATA_SX8200PNP_2J1120011596 -> ../../nvme0n1
[root at ovirt1 ~]# cat /sys/block/nvme0n1/queue/scheduler
[none] mq-deadline kyber
Note: If device is under multipath , you need to check all paths (you can get them from 'multipath -ll' command).The only scheduler you should avoid is "cfq" which was default for RHEL 6 & SLES 11.
XFS has better performance that ext-based systems.
Another tuning is to use Red hat's tuned profiles for gluster. You can extract them from (or newer if you find) ftp://ftp.redhat.com/redhat/linux/enterprise/7Server/en/RHS/SRPMS/redhat-storage-server-

About MTU - it's reducing the ammount of packages that the kernel has to process - but requires infrastructure to support that too. You can test by setting MTU on both sides to 9000 and then run 'tracepath remote-ip'. Also run a ping with large size without do not fragment flag ->  'ping -M do -s  8900 <destination-ip>' If ping comes back - you are good to go.

Best Regards,Strahil Nikolov

    В вторник, 7 януари 2020 г., 3:00:23 ч. Гринуич-5, David Cunningham <dcunningham at voisonics.com> написа:  
 Hi Strahil,
I believe we are using the standard MTU of 1500 (would need to check with the network people to be sure). Does it make a difference?
I'm afraid I don't know about the scheduler - where do I find that?
Thank you for the suggestions about turning off performance.read-ahead and performance.readdir-ahead.

On Tue, 7 Jan 2020 at 18:08, Strahil <hunter86_bg at yahoo.com> wrote:

Hi David,

It's difficult to find anything structured (but it's the same for Linux and other  tech). I use Red Hat's doxumentation, guideds online (crosscheck the options with official documentation) and experience shared on the mailing list.

I don't see anything (iin /var/lib/gluster/groups) that will match your profile, but I think that you should try with performance.read-ahead  and performance.readdir-ahead 'off' . I have found out a bug (didn't read  the whole stuff) ,  that might be interesting for you :


Also, Arbiter is very important in order to avoid split brain situations (but based on my experience , issues still can occur) and best the brick for the Arbiter to be an SSD as it needs to process the metadata as fast as possible. With v7, there  is an option the client to have an Arbiter even in the cloud (remote arbiter) that is used only when 1 data brick is down.

Please report the issue with the cache  - that should not be like that.

Are you using Jumbo frames  (MTU 9000)?
What is yoir brick's  I/O scheduler  ?

Best Regards,
Strahil Nikolov

On Jan 7, 2020 01:34, David Cunningham <dcunningham at voisonics.com> wrote:

Hi Strahil,
We may have had a heal since the GFS arbiter node wasn't accessible from the GFS clients, only from the other GFS servers. Unfortunately we haven't been able to produce the problem seen in production while testing so are unsure whether making the GFS arbiter node directly available to clients has fixed the issue.
The load on GFS is mainly:1. There are a small number of files around 5MB in size which are read often and change infrequently.2. There are a large number of directories which are opened for reading to read the list of contents frequently.3. There are a large number of new files around 5MB in size written frequently and read infrequently.
We haven't touched the tuning options as we don't really feel qualified to tell what needs changed from the default. Do you know of any suitable guides to get started?
For some reason performance.cache-size is reported as both 32MB and 128MB. Is it worth reporting even for version 5.6?
Here is the "gluster volume info" taken on the first node. Note that the third node (the arbiter) is currently taken out of the cluster:Volume Name: gvol0
Type: Replicate
Volume ID: fb5af69e-1c3e-4164-8b23-c1d7bec9b1b6
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Brick1: gfs1:/nodirectwritedata/gluster/gvol0
Brick2: gfs2:/nodirectwritedata/gluster/gvol0
Options Reconfigured:
diagnostics.client-log-level: INFO
performance.client-io-threads: off
nfs.disable: on
transport.address-family: inet

Thanks for your help and advice.

On Sat, 28 Dec 2019 at 17:46, Strahil <hunter86_bg at yahoo.com> wrote:

Hi David,

It seems that I have misread your quorum options, so just ignore that from my previous e-mail.

Best Regards,
Strahil Nikolov
On Dec 27, 2019 15:38, Strahil <hunter86_bg at yahoo.com> wrote:

Hi David,

Gluster supports live rolling upgrade, so there is no need to redeploy at all - but the migration notes should be checked as some features must be disabled first.
Also, the gluster client should remount in order to bump the gluster op-version.

What kind of workload do you have ?
I'm asking as there  are predefined (and recommended) settings located at /var/lib/gluster/groups .
You can check the options for each group and cross-check the options meaning in the docs before  activating a setting.

I still have a vague feeling  that ,during that high-peak of network bandwidth, there was  a  heal  going on. Have you checked that ?

Also, sharding is very useful , when you work with large files and the heal is reduced to the size of the shard.

N.B.: Once sharding is enabled, DO NOT DISABLE it - as you will loose  your data.

Using GLUSTER v7.1 (soon on CentOS  & Debian) allows using latest features  and optimizations while support from gluster Dev community is quite active.

P.S: I'm wondering how 'performance.cache-size' can both be 32 MB and 128 MB. Please double-check this (maybe I'm reading it wrong on my smartphone) and if needed raise a bug on bugzilla.redhat.com 

P.S2: Please  provide  'gluster volume info' as 'cluster.quorum-type' ->  'none' is not normal for replicated volumes (arbiters are using in replica volumes)

According to the dooutput (otps://docs.gluster.org/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/) :

Note: Enabling the arbiter feature automatically configures client-quorum to 'auto'. This setting is not to be changed.

Here is my output (Hyperconverged Virtualization Cluster -> oVirt):
# gluster volume info engine |  grep quorum
cluster.quorum-type: auto
cluster.server-quorum-type: server

Changing quorum is more 'riskier' than other options, so you need to take necessary measures.  I think , we all  know what will happen , if the cluster is out of quorum and you change the quorum settings to more stringent ones :D

P.S3: If you decide to reset  your gluster volume to the defaults, you can create a new volume (same type as current one), the  get the options for that volume and put them in a file and then bulk deploy via 'gluster volume set <Original Volume>   group custom-group' ,  where  the file is located on every gluster  server in the '/var/lib/gluster/groups' directory.
Last ,  get rid of the sample volume.

Best Regards,
Strahil Nikolov
On Dec 27, 2019 03:22, David Cunningham <dcunningham at voisonics.com> wrote:

Hi Strahil,
Our volume options are as below. Thanks for the suggestion to upgrade to version 6 or 7. We could do that be simply removing the current installation and installing the new one (since it's not live right now). We might have to convince the customer that it's likely to succeed though, as at the moment I think they believe that GFS is not going to work for them.
Option                                  Value                                   
------                                  -----                                   
cluster.lookup-unhashed                 on                                      
cluster.lookup-optimize                 on                                      
cluster.min-free-disk                   10%                                     
cluster.min-free-inodes                 5%                                      
cluster.rebalance-stats                 off                                     
cluster.subvols-per-directory           (null)                                  
cluster.readdir-optimize                off                                     
cluster.rsync-hash-regex                (null)                                  
cluster.extra-hash-regex                (null)                                  
cluster.dht-xattr-name                  trusted.glusterfs.dht                   
cluster.randomize-hash-range-by-gfid    off                                     
cluster.rebal-throttle                  normal                                  
cluster.lock-migration                  off                                     
cluster.force-migration                 off                                     
cluster.local-volume-name               (null)                                  
cluster.weighted-rebalance              on                                      
cluster.switch-pattern                  (null)                                  
cluster.entry-change-log                on                                      
cluster.read-subvolume                  (null)                                  
cluster.read-subvolume-index            -1                                      
cluster.read-hash-mode                  1                                       
cluster.background-self-heal-count      8                                       
cluster.metadata-self-heal              on                                      
cluster.data-self-heal                  on                                      
cluster.entry-self-heal                 on                                      
cluster.self-heal-daemon                on                                      
cluster.heal-timeout                    600                                     
cluster.self-heal-window-size           1                                       
cluster.data-change-log                 on                                      
cluster.metadata-change-log             on                                      
cluster.data-self-heal-algorithm        (null)                                  
cluster.eager-lock                      on                                      
disperse.eager-lock                     on                                      
disperse.other-eager-lock               on                                      
disperse.eager-lock-timeout             1                                       
disperse.other-eager-lock-timeout       1                                       
cluster.quorum-type                     none                                    
cluster.quorum-count                    (null)                                  
cluster.choose-local                    true                                    
cluster.self-heal-readdir-size          1KB                                     
cluster.post-op-delay-secs              1                                       
cluster.ensure-durability               on                                      
cluster.consistent-metadata             no                                      
cluster.heal-wait-queue-length          128                                     
cluster.favorite-child-policy           none                                    
cluster.full-lock                       yes                                     
cluster.stripe-block-size               128KB                                   
cluster.stripe-coalesce                 true                                    
diagnostics.latency-measurement         off                                     
diagnostics.dump-fd-stats               off                                     
diagnostics.count-fop-hits              off                                     
diagnostics.brick-log-level             INFO                                    
diagnostics.client-log-level            INFO                                    
diagnostics.brick-sys-log-level         CRITICAL                                
diagnostics.client-sys-log-level        CRITICAL                                
diagnostics.brick-logger                (null)                                  
diagnostics.client-logger               (null)                                  
diagnostics.brick-log-format            (null)                                  
diagnostics.client-log-format           (null)                                  
diagnostics.brick-log-buf-size          5                                       
diagnostics.client-log-buf-size         5                                       
diagnostics.brick-log-flush-timeout     120                                     
diagnostics.client-log-flush-timeout    120                                     
diagnostics.stats-dump-interval         0                                       
diagnostics.fop-sample-interval         0                                       
diagnostics.stats-dump-format           json                                    
diagnostics.fop-sample-buf-size         65535                                   
diagnostics.stats-dnscache-ttl-sec      86400                                   
performance.cache-max-file-size         0                                       
performance.cache-min-file-size         0                                       
performance.cache-refresh-timeout       1                                       
performance.cache-size                  32MB                                    
performance.io-thread-count             16                                      
performance.high-prio-threads           16                                      
performance.normal-prio-threads         16                                      
performance.low-prio-threads            16                                      
performance.least-prio-threads          1                                       
performance.enable-least-priority       on                                      
performance.iot-watchdog-secs           (null)                                  
performance.iot-pass-through            false                                   
performance.io-cache-pass-through       false                                   
performance.cache-size                  128MB                                   
performance.qr-cache-timeout            1                                       
performance.cache-invalidation          false                                   
performance.ctime-invalidation          false                                   
performance.flush-behind                on                                      
performance.nfs.flush-behind            on                                      
performance.write-behind-window-size    1MB                                     
performance.strict-o-direct             off                                     
performance.nfs.strict-o-direct         off                                     
performance.strict-write-ordering       off                                     
performance.nfs.strict-write-ordering   off                                     
performance.aggregate-size              128KB                                   
performance.lazy-open                   yes                                     
performance.read-after-open             yes                                     
performance.open-behind-pass-through    false                                   
performance.read-ahead-page-count       4                                       
performance.read-ahead-pass-through     false                                   
performance.readdir-ahead-pass-through  false                                   
performance.md-cache-pass-through       false                                   
performance.md-cache-timeout            1                                       
performance.cache-swift-metadata        true                                    
performance.cache-samba-metadata        false                                   
performance.cache-capability-xattrs     true                                    
performance.cache-ima-xattrs            true                                    
performance.md-cache-statfs             off                                     
performance.nl-cache-pass-through       false                                   
features.encryption                     off                                     
encryption.master-key                   (null)                                  
encryption.data-key-size                256                                     
encryption.block-size                   4096                                    
network.frame-timeout                   1800                                    
network.ping-timeout                    42                                      
network.tcp-window-size                 (null)                                  
network.remote-dio                      disable                                 
client.event-threads                    2                                       
client.tcp-user-timeout                 0                                       
client.keepalive-time                   20                                      
client.keepalive-interval               2                                       
client.keepalive-count                  9                                       
network.tcp-window-size                 (null)                                  
network.inode-lru-limit                 16384                                   
auth.allow                              *                                       
auth.reject                             (null)                                  
transport.keepalive                     1                                       
server.allow-insecure                   on                                      
server.root-squash                      off                                     
server.anonuid                          65534                                   
server.anongid                          65534                                   
server.statedump-path                   /var/run/gluster                        
server.outstanding-rpc-limit            64                                      
server.ssl                              (null)                                  
auth.ssl-allow                          *                                       
server.manage-gids                      off                                     
server.dynamic-auth                     on                                      
client.send-gids                        on                                      
server.gid-timeout                      300                                     
server.own-thread                       (null)                                  
server.event-threads                    1                                       
server.tcp-user-timeout                 0                                       
server.keepalive-time                   20                                      
server.keepalive-interval               2                                       
server.keepalive-count                  9                                       
transport.listen-backlog                1024                                    
ssl.own-cert                            (null)                                  
ssl.private-key                         (null)                                  
ssl.ca-list                             (null)                                  
ssl.crl-path                            (null)                                  
ssl.certificate-depth                   (null)                                  
ssl.cipher-list                         (null)                                  
ssl.dh-param                            (null)                                  
ssl.ec-curve                            (null)                                  
transport.address-family                inet                                    
performance.write-behind                on                                      
performance.read-ahead                  on                                      
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features.ctr-enabled                    off                                     
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features.ctr_lookupheal_link_timeout    300                                     
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performance.nl-cache-positive-entry     false                                   
performance.nl-cache-limit              10MB                                    
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disperse.stripe-cache                   4                                       
cluster.halo-enabled                    False                                   
cluster.halo-shd-max-latency            99999                                   
cluster.halo-nfsd-max-latency           5                                       
cluster.halo-max-latency                5                                       
cluster.halo-max-replicas               99999                                   
cluster.halo-min-replicas               2                                       
cluster.daemon-log-level                INFO                                    
debug.delay-gen                         off                                     
delay-gen.delay-percentage              10%                                     
delay-gen.delay-duration                100000                                  
disperse.parallel-writes                on                                      
features.sdfs                           on                                      
features.cloudsync                      off                                     
features.utime                          off                                     
ctime.noatime                           on                                      
feature.cloudsync-storetype             (null)                                  

Thanks again.

On Wed, 25 Dec 2019 at 05:51, Strahil <hunter86_bg at yahoo.com> wrote:

Hi David,

On Dec 24, 2019 02:47, David Cunningham <dcunningham at voisonics.com> wrote:
> Hello,
> In testing we found that actually the GFS client having access to all 3 nodes made no difference to performance. Perhaps that's because the 3rd node that wasn't accessible from the client before was the arbiter node?
It makes sense, as no data is being generated towards the arbiter.
> Presumably we shouldn't have an arbiter node listed under backupvolfile-server when mounting the filesystem? Since it doesn't store all the data surely it can't be used to serve the data.

I have my arbiter defined as last backup and no issues so far. At least the admin can easily identify the bricks from the mount options.

> We did have direct-io-mode=disable already as well, so that wasn't a factor in the performance problems.

Have you checked if the client vedsion ia not too old.
Also you can check the cluster's  operation cersion:
# gluster volume get all cluster.max-op-version
# gluster volume get all cluster.op-version

Cluster's op version should be at max-op-version.

In my mind come 2  options:
A) Upgrade to latest GLUSTER v6 or even v7 ( I know it won't be easy) and then set the op version to highest possible.
# gluster volume get all cluster.max-op-version
# gluster volume get all cluster.op-version

B)  Deploy a NFS Ganesha server and connect the client over NFS v4.2 (and control the parallel connections from Ganesha).

Can you provide your  Gluster volume's  options?
'gluster volume get <VOLNAME>  all'

> Thanks again for any advice.
> On Mon, 23 Dec 2019 at 13:09, David Cunningham <dcunningham at voisonics.com> wrote:
>> Hi Strahil,
>> Thanks for that. We do have one backup server specified, but will add the second backup as well.
>> On Sat, 21 Dec 2019 at 11:26, Strahil <hunter86_bg at yahoo.com> wrote:
>>> Hi David,
>>> Also consider using the  mount option to specify backup server via 'backupvolfile-server=server2:server3' (you can define more but I don't thing replica volumes  greater that 3 are usefull (maybe  in some special cases).
>>> In such way, when the primary is lost, your client can reach a backup one without disruption.
>>> P.S.: Client may 'hang' - if the primary server got rebooted ungracefully - as the communication must timeout before FUSE addresses the next server. There is a special script for  killing gluster processes in '/usr/share/gluster/scripts' which can be used  for  setting up a systemd service to do that for you on shutdown.
>>> Best Regards,
>>> Strahil Nikolov
>>> On Dec 20, 2019 23:49, David Cunningham <dcunningham at voisonics.com> wrote:
>>>> Hi Stahil,
>>>> Ah, that is an important point. One of the nodes is not accessible from the client, and we assumed that it only needed to reach the GFS node that was mounted so didn't think anything of it.
>>>> We will try making all nodes accessible, as well as "direct-io-mode=disable".
>>>> Thank you.
>>>> On Sat, 21 Dec 2019 at 10:29, Strahil Nikolov <hunter86_bg at yahoo.com> wrote:
>>>>> Actually I haven't clarified myself.
>>>>> FUSE mounts on the client side is connecting directly to all bricks consisted of the volume.
>>>>> If for some reason (bad routing, firewall blocked) there could be cases where the client can reach 2 out of 3 bricks and this can constantly cause healing to happen (as one of the bricks is never updated) which will degrade the performance and cause excessive network usage.
>>>>> As your attachment is from one of the gluster nodes, this could be the case.
>>>>> Best Regards,
>>>>> Strahil Nikolov
>>>>> В петък, 20 декември 2019 г., 01:49:56 ч. Гринуич+2, David Cunningham <dcunningham at voisonics.com> написа:
>>>>> Hi Strahil,
>>>>> The chart attached to my original email is taken from the GFS server.
>>>>> I'm not sure what you mean by accessing all bricks simultaneously. We've mounted it from the client like this:
>>>>> gfs1:/gvol0 /mnt/glusterfs/ glusterfs defaults,direct-io-mode=disable,_netdev,backupvolfile-server=gfs2,fetch-attempts=10 0 0
>>>>> Should we do something different to access all bricks simultaneously?
>>>>> Thanks for your help!
>>>>> On Fri, 20 Dec 2019 at 11:47, Strahil Nikolov <hunter86_bg at yahoo.com> wrote:
>>>>>> I'm not sure if you did measure the traffic from client side (tcpdump on a client machine) or from Server side.
>>>>>> In both cases , please verify that the client accesses all bricks simultaneously, as this can cause unnecessary heals.
>>>>>> Have you thought about upgrading to v6? There are some enhancements in v6 which could be beneficial.
>>>>>> Yet, it is indeed strange that so much traffic is generated with FUSE.
>>>>>> Another aproach is to test with NFSGanesha which suports pNFS and can natively speak with Gluster, which cant bring you closer to the previous setup and also provide some extra performance.
>>>>>> Best Regards,
>>>>>> Strahil Nikolov
>> -- 
>> David Cunningham, Voisonics Limited
>> http://voisonics.com/
>> USA: +1 213 221 1092
>> New Zealand: +64 (0)28 2558 3782
> -- 
> David Cunningham, Voisonics Limited
> http://voisonics.com/
> USA: +1 213 221 1092
> New Zealand: +64 (0)28 2558 3782

Best Regards,
Strahil Nikolov

David Cunningham, Voisonics Limited
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782

David Cunningham, Voisonics Limited
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782

David Cunningham, Voisonics Limited
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782  
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