Make a simple simulation !

Use your own crushmap :

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Or create a sample clushmap :

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Simulate the rule 0 or your own :

$ crushtool --test -i crushmap --rule 0 --show-mappings --min-x 0 --max-x 10 --num-rep 2

CRUSH rule 0 x 0 [0,12]
CRUSH rule 0 x 1 [5,24]
CRUSH rule 0 x 2 [9,14]
CRUSH rule 0 x 3 [30,11]
CRUSH rule 0 x 4 [20,10]
CRUSH rule 0 x 5 [28,0]
CRUSH rule 0 x 6 [6,34]
CRUSH rule 0 x 7 [19,31]
CRUSH rule 0 x 8 [17,26]
CRUSH rule 0 x 9 [9,20]
CRUSH rule 0 x 10 [10,33]

crushtool --test -i crushmap --rule 0 --show-mappings --min-x 0 --max-x 10 --num-rep 3

CRUSH rule 0 x 0 [0,12,32]
CRUSH rule 0 x 1 [5,24,20]
CRUSH rule 0 x 2 [9,14,28]
CRUSH rule 0 x 3 [30,11,13]
CRUSH rule 0 x 4 [20,10,31]
CRUSH rule 0 x 5 [28,0,12]
CRUSH rule 0 x 6 [6,34,14]
CRUSH rule 0 x 7 [19,31,6]
CRUSH rule 0 x 8 [17,26,5]
CRUSH rule 0 x 9 [9,20,30]
CRUSH rule 0 x 10 [10,33,12]

In general it’s going well. But in some cases it could be better to test.

In some cases, some operations may take a little longer to be processed by the osd. And the operation may fail, or even make the OSD to suicide. There are many parameters for these timeouts. Some examples :

Thread suicide timed out

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heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7f1ee3ca7700' had suicide timed out after 150
common/HeartbeatMap.cc: In function 'bool ceph::HeartbeatMap::_check(ceph::heartbeat_handle_d*, const char*, time_t)' thread 7f1f0c2a3700 time 2017-03-03 11:03:46.550118
common/HeartbeatMap.cc: 79: FAILED assert(0 == "hit suicide timeout")

花猫破解版

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花猫破解osd_op_thread_suicide_timeout = 900

Operation thread timeout

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heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fd306416700' had timed out after 15

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ceph tell osd.XX injectargs --osd-op-thread-timeout 90
(default value is 15s)

Recovery thread timout

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heartbeat_map is_healthy 'OSD::recovery_tp thread 0x7f4c2edab700' had timed out after 30

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ceph tell osd.XX injectargs --osd-recovery-thread-timeout 180
花猫破解版

For more details, please refer to ceph documentation :

http://docs.ceph.com/docs/master/rados/configuration/osd-config-ref/

Erasure code is rather designed for clusters with a sufficient size. However if you want to use it with a small amount of hosts you can also adapt the crushmap for a better matching distribution to your need.

Here a first example for distributing data with 1 host OR 2 drive fault tolerance with k=4, m=2 on 3 hosts and more.

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rule erasure_ruleset {
  ruleset X
  type erasure
花猫破解版  max_size 6
  step take default
  step choose indep 3 type host
  step choose indep 2 type osd
  step emit
}