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+# Changed (for katrin_data)
+gluster volume set katrin_data server.event-threads 8 # 1
+gluster volume set katrin_data client.event-threads 8 # 2
+gluster volume set katrin_data performance.io-thread-count 32 # 16
+gluster volume set katrin_data cluster.lookup-optimize on # off
+gluster volume set katrin_data cluster.readdir-optimize on # off
+
+# Already set
+performance.stat-prefetch: on
+performance.readdir-ahead: on
+performance.io-cache: on
+cluster.choose-local: true
+performance.flush-behind: on
+performance.write-behind-window-size: 1MB
+
+# Shall we ?
+gluster volume set katrin_data server.outstanding-rpc-limit # 64
+
+# Does this cache (per-client size) makes sence with 1-10s delay?
+gluster volume set katrin_data performance.cache-refresh-timeout 10 # 1 (seconds)
+gluster volume set katrin_data performance.cache-size 1GB # 32MB
+gluster volume set katrin_data performance.write-behind-window-size # 1MB
+gluster volume set katrin_data performance.cache-max-file-size 2MB # 0 (unlimited)
+
+# Major, but seems to affect only Samba/NFS in 3.x
+gluster volume set katrin_data features.cache-invalidation on # off
+gluster volume set katrin_data performance.cache-invalidation on # off
+gluster volume set katrin_data features.cache-invalidation-timeout 600 # 60
+gluster volume set katrin_data performance.md-cache-timeout 600 # 1
+
+# Not recommended
+gluster volume set katrin_data performance.client-io-threads on # off
+
+
+Systemctl (not applied as we use rdma anyway)
+=========
+sysctl -w net.ipv4.tcp_congestion_control=htcp # cubic
+sysctl -w net.ipv4.tcp_mtu_probing=1 # recommended for hosts with jumbo frames enabled
+
+# Optimal value unclear (big value may harm small file performance)
+sysctl -w net.ipv4.tcp_rmem = 4096 87380 33554432 # increase Linux autotuning TCP buffer limit to 32MB
+sysctl -w net.ipv4.tcp_wmem = 4096 87380 33554432
+sysctl -w net.core.rmem_max = 67108864 # allow testing with buffers up to 64MB
+sysctl -w net.core.wmem_max = 67108864
+sysctl -w net.core.netdev_max_backlog = 30000 # increase the length of the processor input queue