Hi,
I used in ceph v0.38 the host and rack feature in the conf during an
mkcephfs. Now I have to problems with the crushmap
1. I cannot compile a ceph genearated crushmap.
crushtool -c file.txt -o file
file.txt:4 error: parse error at '.0'
# begin crush map
# devices
device 0 osd.0
2. Why are 2 racks are not enough for 2 failure domains?
From the commit:
If there are >2 racks, separate across racks.
and in the src/osd/OSDMap.cc
if (racks.size() > 3) {
// spread replicas across hosts
crush_rule_set_step(rule, 1, CRUSH_RULE_CHOOSE_LEAF_FIRSTN,
CRUSH_CHOOSE_N, 2);
shouldn't that be
if (racks.size() > 1) {
// spread replicas across racks
crush_rule_set_step(rule, 1, CRUSH_RULE_CHOOSE_LEAF_FIRSTN,
CRUSH_CHOOSE_N, 2);
Best Regards,
martin
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