[Gluster-users] replica performance and brick size best practice

Strahil Nikolov hunter86_bg at yahoo.com
Sun Nov 20 07:59:19 UTC 2022

According to RH,the most optimal would be to have:- Disk size: 3-4TB (faster resync after failure)- Disk count: 10-12- HW raid : As you can also see on the picture that the optimal one for writes is RAID10 https://community.hpe.com/t5/servers-systems-the-right/what-are-raid-levels-and-which-are-best-for-you/ba-p/7041151
The full stripe size should be between 1MB and 2MB (prefer staying closer to the 1MB).
I'm not sure of the HW Raid controller capabilities, but I would also switch the I/O scheduler to 'none' (First-In First-out while merging the requests).Enaure that you have a battery-backed cache and the cache ratio of the controller is leaning towards the writes (something like 25% read, 75% write).
Jumbo Frames are recomended but not mandatory.Still, they will reduce the number of packets processed by your infrastructure which is always benefitial.
Tuned Profile:You can find the tuned profiles that were usually shipped with Red Hat'sGluster Storage at https://ftp.redhat.com/redhat/linux/enterprise/7Server/en/RHS/SRPMS/redhat-storage-server-
I will type the contents of the random-io profile here, so please double check it for typos.
# /etc/tuned.d/rhgs-random-io/tuned.conf:[main]include=throughput-performace
[sysctl]vm.dirty_ratio = 5vm.dirty_background_ratio = 2
Don't forget to install tuned before that.
For small files , Follow the guidelines from https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/administration_guide/small_file_performance_enhancements
Note: Do not use Gluster v9 and update your version to the latest minor one (for example if you use v10 -> update to 10.3). In Gluster v10 a major improvement was done for small files and v9 is out of support now.
For the XFS: Mount the bricks with 'noatime'. If you use SELINUX , use the following:noatime,context="system_u:object_r:glusterd_brick_t:s0"Also, consider setting gluster's option  'cluster.min-free-disk' to something that makes sense for you (for details run 'gluster volume set help').

Of course do benchmarking with the application itself and both before and after you made a change.
Best Regards,Strahil Nikolov 

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