Hardware RAID 5 on SSD's using LVM formatted with XFS default options mounted with noatime
Also I don't a lot of history for this current troubled machine but the sysctl additions don't appear to have made a significant difference ----- Original Message ----- From: "Nick Majeran" <[email protected]> To: "Josh Boon" <[email protected]> Cc: "Carlos Capriotti" <[email protected]>, "[email protected] List" <[email protected]> Sent: Thursday, March 20, 2014 8:31:11 PM Subject: Re: [Gluster-users] Optimizing Gluster (gfapi) for high IOPS Just curious, what is your disk layout for the bricks? On Mar 20, 2014, at 6:27 PM, Josh Boon < [email protected] > wrote: Stuck those in as is. Will look at optimizing based on my system's config too. ----- Original Message ----- From: "Carlos Capriotti" < [email protected] > To: "Josh Boon" < [email protected] > Cc: " [email protected] List" < [email protected] > Sent: Thursday, March 20, 2014 7:21:08 PM Subject: Re: [Gluster-users] Optimizing Gluster (gfapi) for high IOPS Well, if you want to join my tests, here are a couple of sysctl options: net.core.wmem_max=12582912 net.core.rmem_max=12582912 net.ipv4.tcp_rmem= 10240 87380 12582912 net.ipv4.tcp_wmem= 10240 87380 12582912 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_timestamps = 1 net.ipv4.tcp_sack = 1 vm.swappiness=10 vm.dirty_background_ratio=1 net.ipv4.neigh.default.gc_thresh2=2048 net.ipv4.neigh.default.gc_thresh3=4096 net.core.netdev_max_backlog=2500 net.ipv4.tcp_mem= 12582912 12582912 12582912 On Fri, Mar 21, 2014 at 12:05 AM, Josh Boon < [email protected] > wrote: <blockquote> Hey folks, We've been running VM's on qemu using a replicated gluster volume connecting using gfapi and things have been going well for the most part. Something we've noticed though is that we have problems with many concurrent disk operations and disk latency. The latency gets bad enough that the process eats the cpu and the entire machine stalls. The place where we've seen it the worst is a apache2 server under very high load which had to be converted to raw disk image due to performance issues. The hypervisors are connected directly to each other over a bonded pair of 10Gb fiber modules and are the only bricks in the volume. Volume info is Volume Name: VMARRAY Type: Replicate Volume ID: 67b3ad79-4b48-4597-9433-47063f90a7a0 Status: Started Number of Bricks: 1 x 2 = 2 Transport-type: tcp Bricks: Brick1: 10.9.1.1:/mnt/xfs/VMARRAY Brick2: 10.9.1.2:/mnt/xfs/VMARRAY Options Reconfigured: nfs.disable: on network.ping-timeout: 7 cluster.eager-lock: on performance.flush-behind: on performance.write-behind: on performance.write-behind-window-size: 4MB performance.cache-size: 1GB server.allow-insecure: on diagnostics.client-log-level: ERROR Any advice for performance improvements for high IO / low bandwidth tuning would be appreciated. Thanks, Josh _______________________________________________ Gluster-users mailing list [email protected] http://supercolony.gluster.org/mailman/listinfo/gluster-users </blockquote> <blockquote> _______________________________________________ Gluster-users mailing list [email protected] http://supercolony.gluster.org/mailman/listinfo/gluster-users </blockquote>
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