Re: Brick Reboot => VMs slowdown, client crashes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



/var/lib/glusterd/groups/virt is a good start for ideas, notably some thread settings and choose-local=off to improve read performance. If you don’t have at least 10 cores on your servers, you may want to lower the recommended shd-max-threads=8 to no more than half your CPU cores to keep healing from swamping out regular work.

It’s also starting to depend on what your backing store and networking setup are, so you’re going to want to test changes and find what works best for your setup.

In addition to the virt group settings, I use these on most of my volumes, SSD or HDD backed, with the default 64M shard size:

performance.io-thread-count: 32 # seemed good for my system, particularly a ZFS backed volume with lots of spindles
client.event-threads: 8
cluster.data-self-heal-algorithm: full # 10G networking, uses more net/less cpu to heal. probably don’t use this for 1G networking?
performance.stat-prefetch: on
cluster.read-hash-mode: 3 # distribute reads to least loaded server (by read queue depth)

and these two only on my HDD backed volume:

performance.cache-size: 1G
performance.write-behind-window-size: 64MB

but I suspect these two need another round or six of tuning to tell if they are making a difference.

I use the throughput-performance tuned profile on my servers, so you should be in good shape there.

On Aug 19, 2019, at 12:22 PM, Guy Boisvert <guy.boisvert@xxxxxxxxxxxxxxxx> wrote:

On 2019-08-19 12:08 p.m., Darrell Budic wrote:
You also need to make sure your volume is setup properly for best performance. Did you apply the gluster virt group to your volumes, or at least features.shard = on on your VM volume?

That's what we did here:


gluster volume set W2K16_Rhenium cluster.quorum-type auto
gluster volume set W2K16_Rhenium network.ping-timeout 10
gluster volume set W2K16_Rhenium auth.allow \*
gluster volume set W2K16_Rhenium group virt
gluster volume set W2K16_Rhenium storage.owner-uid 36
gluster volume set W2K16_Rhenium storage.owner-gid 36
gluster volume set W2K16_Rhenium features.shard on
gluster volume set W2K16_Rhenium features.shard-block-size 256MB
gluster volume set W2K16_Rhenium cluster.data-self-heal-algorithm full
gluster volume set W2K16_Rhenium performance.low-prio-threads 32

tuned-adm profile random-io        (a profile i added in CentOS 7)


cat /usr/lib/tuned/random-io/tuned.conf
===========================================
[main]
summary=Optimize for Gluster virtual machine storage
include=throughput-performance

[sysctl]

vm.dirty_ratio = 5
vm.dirty_background_ratio = 2


Any more optimization to add to this?


Guy

--
Guy Boisvert, ing.
IngTegration inc.
http://www.ingtegration.com
https://www.linkedin.com/in/guy-boisvert-8990487

AVIS DE CONFIDENTIALITE : ce message peut contenir des
renseignements confidentiels appartenant exclusivement a
IngTegration Inc. ou a ses filiales. Si vous n'etes pas
le destinataire indique ou prevu dans ce  message (ou
responsable de livrer ce message a la personne indiquee ou
prevue) ou si vous pensez que ce message vous a ete adresse
par erreur, vous ne pouvez pas utiliser ou reproduire ce
message, ni le livrer a quelqu'un d'autre. Dans ce cas, vous
devez le detruire et vous etes prie d'avertir l'expediteur
en repondant au courriel.

CONFIDENTIALITY NOTICE : Proprietary/Confidential Information
belonging to IngTegration Inc. and its affiliates may be
contained in this message. If you are not a recipient
indicated or intended in this message (or responsible for
delivery of this message to such person), or you think for
any reason that this message may have been addressed to you
in error, you may not use or copy or deliver this message to
anyone else. In such case, you should destroy this message
and are asked to notify the sender by reply email.


_______________________________________________
Gluster-users mailing list
Gluster-users@xxxxxxxxxxx
https://lists.gluster.org/mailman/listinfo/gluster-users

[Index of Archives]     [Gluster Development]     [Linux Filesytems Development]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux