[Gluster-users] [External] To good to be truth speed improvements?

Diego Remolina dijuremo at gmail.com
Tue Jan 15 13:28:17 UTC 2019

Hi Davide,

The options information is already provided in prior e-mail, see the
termbin.con link for the options of the volume after the 4.1.6 upgrade.

The gluster options set on the volume are:

This is the other piece:

# gluster v info export

Volume Name: export
Type: Replicate
Volume ID: b4353b3f-6ef6-4813-819a-8e85e5a95cff
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Options Reconfigured:
performance.stat-prefetch: on
performance.cache-min-file-size: 0
network.inode-lru-limit: 65536
performance.cache-invalidation: on
features.cache-invalidation: on
performance.md-cache-timeout: 600
features.cache-invalidation-timeout: 600
performance.cache-samba-metadata: on
transport.address-family: inet
server.allow-insecure: on
performance.cache-size: 10GB
cluster.server-quorum-type: server
nfs.disable: on
performance.io-thread-count: 64
performance.io-cache: on
cluster.lookup-optimize: on
cluster.readdir-optimize: on
server.event-threads: 5
client.event-threads: 5
performance.cache-max-file-size: 256MB
diagnostics.client-log-level: INFO
diagnostics.brick-log-level: INFO
cluster.server-quorum-ratio: 51%

Now I did create a backup of /var/lib/glusterd so if you tell me how to
pull information from there to compare I can do it.

I compared the file /var/lib/glusterd/vols/export/info and it is the same
in both, though entries are in different order.


On Tue, Jan 15, 2019 at 5:03 AM Davide Obbi <davide.obbi at booking.com> wrote:

> On Tue, Jan 15, 2019 at 2:18 AM Diego Remolina <dijuremo at gmail.com> wrote:
>> Dear all,
>> I was running gluster 3.10.12 on a pair of servers and recently upgraded
>> to 4.1.6. There is a cron job that runs nightly in one machine, which
>> rsyncs the data on the servers over to another machine for backup purposes.
>> The rsync operation runs on one of the gluster servers, which mounts the
>> gluster volume via fuse on /export.
>> When using 3.10.12, this process would start at 8:00PM nightly, and
>> usually end up at around 4:30AM when the servers had been freshly rebooted.
>> From this point, things would start taking a bit longer and stabilize
>> ending at around 7-9AM depending on actual file changes and at some point
>> the servers would start eating up so much ram (up to 30GB) and I would have
>> to reboot them to bring things back to normal as the file system would
>> become extremely slow (perhaps the memory leak I have read was present on
>> 3.10.x).
>> After upgrading to 4.1.6 over the weekend, I was shocked to see the rsync
>> process finish in about 1 hour and 26 minutes. This is compared to 8 hours
>> 30 mins with the older version. This is a nice speed up, however, I can
>> only ask myself what has changed so drastically that this process is now so
>> fast. Have there really been improvements in 4.1.6 that could speed this up
>> so dramatically? In both of my test cases, there would had not really been
>> a lot to copy via rsync given the fresh reboots are done on Saturday after
>> the sync has finished from the day before.
>> In general, the servers (which are accessed via samba for windows
>> clients) are much faster and responsive since the update to 4.1.6. Tonight
>> I will have the first rsync run which will actually have to copy the day's
>> changes and will have another point of comparison.
>> I am still using fuse mounts for samba, due to prior problems with vsf
>> =gluster, which are currently present in Samba 4.8.3-4, and already
>> documented in bugs, for which patches exist, but no official updated samba
>> packages have been released yet. Since I was going from 3.10.12 to 4.1.6 I
>> also did not want to change other things to make sure I could track any
>> issues just related to the change in gluster versions and eliminate other
>> complexity.
>> The file system currently has about 16TB of data in
>> 5142816 files and 696544 directories
>> I've just ran the following code to count files and dirs and it took
>> 67mins 38.957 secs to complete in this gluster volume:
>> https://github.com/ChristopherSchultz/fast-file-count
>> # time ( /root/sbin/dircnt /export )
>> /export contains 5142816 files and 696544 directories
>> real    67m38.957s
>> user    0m6.225s
>> sys     0m48.939s
>> The gluster options set on the volume are:
>> https://termbin.com/yxtd
>> # gluster v status export
>> Status of volume: export
>> Gluster process                             TCP Port  RDMA Port  Online
>> Pid
>> ------------------------------------------------------------------------------
>> Brick           49157     0          Y
>>  13986
>> Brick           49153     0          Y
>>  9953
>> Self-heal Daemon on localhost               N/A       N/A        Y
>>  21934
>> Self-heal Daemon on                N/A       N/A        Y
>>  4598
>> Self-heal Daemon on                N/A       N/A        Y
>>  14485
>> Task Status of Volume export
>> ------------------------------------------------------------------------------
>> There are no active volume tasks
>> Truth, there is a 3rd server here, but no bricks on it.
>> Thoughts?
>> Diego
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> Hi Diego,
> Besides the actual improvements made in the code i think new releases
> might implement volume options by default that before might have had
> different setting. I would have been interesting to diff "gluster volume
> get <volname> all" befor and after the upgrade. Just for curiosity and i am
> trying to figure out volume options for rsync kind of workloads can you
> share the command output anyway along with gluster volume info <volname>?
> thanks
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