I have a test cluster that is up and running. It consists of three mons, and three OSD servers, with each OSD server having eight OSD’s and two SSD’s for journals. I’d like to move from the flat crushmap to a crushmap with typical depth using most of the predefined types. I have the current crushmap decompiled and have edited it to add the additional depth of failure zones. Questions: 1) Do the ID’s of the bucket types need to be consecutive, or can I make them up as long as they are negative in value and unique? 2) Is there any way that I can control the assignment of the bucket type ID’s if I were to update the crushmap on a running system using the CLI? 3) Is there any harm in adding bucket types that are not currently used, but assigning them a weight of 0, so they aren’t used (a row defined, with racks, but the racks have no hosts defined)? 4) Can I have a bucket type with no “item” lines in it, or does each bucket type need at least on item declaration to be valid? Example: # begin crush map # devices device 0 osd.0 device 1 osd.1 device 2 osd.2 device 3 osd.3 device 4 osd.4 device 5 osd.5 device 6 osd.6 device 7 osd.7 device 8 osd.8 device 9 osd.9 device 10 osd.10 device 11 osd.11 device 12 osd.12 device 13 osd.13 device 14 osd.14 device 15 osd.15 device 16 osd.16 device 17 osd.17 device 18 osd.18 device 19 osd.19 device 20 osd.20 device 21 osd.21 device 22 osd.22 device 23 osd.23 # types type 0 osd type 1 host type 2 rack type 3 row type 4 room type 5 datacenter type 6 root # buckets host spucosds01 { id -2 # do not change unnecessarily # weight 29.120 alg straw hash 0 # rjenkins1 item osd.0 weight 3.640 item osd.1 weight 3.640 item osd.2 weight 3.640 item osd.3 weight 3.640 item osd.4 weight 3.640 item osd.5 weight 3.640 item osd.6 weight 3.640 item osd.7 weight 3.640 } host spucosds02 { id -3 # do not change unnecessarily # weight 29.120 alg straw hash 0 # rjenkins1 item osd.8 weight 3.640 item osd.9 weight 3.640 item osd.10 weight 3.640 item osd.11 weight 3.640 item osd.12 weight 3.640 item osd.13 weight 3.640 item osd.14 weight 3.640 item osd.15 weight 3.640 } host spucosds03 { id -4 # do not change unnecessarily # weight 29.120 alg straw hash 0 # rjenkins1 item osd.16 weight 3.640 item osd.17 weight 3.640 item osd.18 weight 3.640 item osd.19 weight 3.640 item osd.20 weight 3.640 item osd.21 weight 3.640 item osd.22 weight 3.640 item osd.23 weight 3.640 } rack rack2-2 { id -220 alg straw hash 0 item spucosds01 weight 29.12 } rack rack3-2 { id -230 alg straw hash 0 item spucosds02 weight 29.12 } rack rack4-2 { id -240 alg straw hash 0 item spucosds03 weight 29.12 } row row1 { id -100 alg straw hash 0 } row row2 { id -200 alg straw hash 0 item rack2-2 weight 29.12 item rack3-2 weight 29.12 item rack4-2 weight 29.12 } datacenter smt { id -1000 alg straw hash 0 item row1 weight 0.0 item row2 weight 87.36 } root default { id -1 # do not change unnecessarily # weight 87.360 alg straw hash 0 # rjenkins1 item smt weight 87.36 } # rules rule data { ruleset 0 type replicated min_size 1 max_size 10 step take default step chooseleaf firstn 0 type host step emit } rule metadata { ruleset 1 type replicated min_size 1 max_size 10 step take default step chooseleaf firstn 0 type host step emit } rule rbd { ruleset 2 type replicated min_size 1 max_size 10 step take default step chooseleaf firstn 0 type host step emit } # end crush map |
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