21 lines
1.3 KiB
Plaintext
21 lines
1.3 KiB
Plaintext
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# set noop scheduler for non-rotating disks (SSD)
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# the glob matches sd* on physical hosts, xvd* on Xen hosts, and vd* on KVM hosts
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ACTION=="add|change", KERNEL=="xvd[a-z]|[sv]d[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop"
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# set deadline scheduler for rotating disks
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# the glob matches sd* on physical hosts, xvd* on Xen hosts, and vd* on KVM hosts
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#
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# newer KVM guests (Ubuntu 14.04 at least, so Linux >=3.13) using virtio vda don't
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# allow it to be set, but it's non fatal so let's just set it for now
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ACTION=="add|change", KERNEL=="xvd[a-z]|[sv]d[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="deadline"
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{% if 'storage' in group_names %}
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## set disk tweaks
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## see: http://www.fhgfs.com/wiki/wikka.php?wakka=StorageServerTuning
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## see: http://community.gluster.org/a/linux-kernel-tuning-for-glusterfs/
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# give the IO scheduler more flexibility by increasing the number of schedulable requests (queue_depth * 2):
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ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/nr_requests}="512"
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# To improve throughput for sequential reads, increase the maximum amount of read-ahead data. The actual amount of read-ahead is adaptive, so using a high value here won't harm performance for small random access.
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ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/read_ahead_kb}="4096"
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{% endif %}
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