Hi, What is your dirty cache settings on the gluster servers ?
Best Regards, Strahil NikolovOn Apr 13, 2019 00:44, Alex McWhirter <a...@triadic.us> wrote: > > I have 8 machines acting as gluster servers. They each have 12 drives > raid 50'd together (3 sets of 4 drives raid 5'd then 0'd together as > one). > > They connect to the compute hosts and to each other over lacp'd 10GB > connections split across two cisco nexus switched with VPC. > > Gluster has the following set. > > performance.write-behind-window-size: 4MB > performance.flush-behind: on > performance.stat-prefetch: on > server.event-threads: 4 > client.event-threads: 8 > performance.io-thread-count: 32 > network.ping-timeout: 30 > cluster.granular-entry-heal: enable > performance.strict-o-direct: on > storage.owner-gid: 36 > storage.owner-uid: 36 > features.shard: on > cluster.shd-wait-qlength: 10000 > cluster.shd-max-threads: 8 > cluster.locking-scheme: granular > cluster.data-self-heal-algorithm: full > cluster.server-quorum-type: server > cluster.quorum-type: auto > cluster.eager-lock: enable > network.remote-dio: off > performance.low-prio-threads: 32 > performance.io-cache: off > performance.read-ahead: off > performance.quick-read: off > auth.allow: * > user.cifs: off > transport.address-family: inet > nfs.disable: off > performance.client-io-threads: on > > > I have the following sysctl values on gluster client and servers, using > libgfapi, MTU 9K > > net.core.rmem_max = 134217728 > net.core.wmem_max = 134217728 > net.ipv4.tcp_rmem = 4096 87380 134217728 > net.ipv4.tcp_wmem = 4096 65536 134217728 > net.core.netdev_max_backlog = 300000 > net.ipv4.tcp_moderate_rcvbuf =1 > net.ipv4.tcp_no_metrics_save = 1 > net.ipv4.tcp_congestion_control=htcp > > reads with this setup are perfect, benchmarked in VM to be about 770MB/s > sequential with disk access times of < 1ms. Writes on the other hand are > all over the place. They peak around 320MB/s sequential write, which is > what i expect but it seems as if there is some blocking going on. > > During the write test i will hit 320MB/s briefly, then 0MB/s as disk > access time shoot to over 3000ms, then back to 320MB/s. It averages out > to about 110MB/s afterwards. > > Gluster version is 3.12.15 ovirt is 4.2.7.5 > > Any ideas on what i could tune to eliminate or minimize that blocking? > _______________________________________________ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/Z7F72BKYKAGICERZETSA4KCLQYR3AORR/ _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@ovirt.org Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/FMB6NCNJL2WKEDWPAM4OJIRF2GIDJUUE/
