RBD 块设备无法map
问题场景
rbd map test_image
rbd: sysfs write failed
rbd: map failed: (5) Input/output error
通过dmesg|tail
看到
mon1 xxxxxxx:6789 feature set mismatch, my XXXXXX < server’s XXXXXX, missing 4000000000000
分析过程：
知道是特征集合不匹配。
通过比对12.2.0和ceph 12.1.3的crushmap
ceph osd crush show-tunables
1
可以看到
[root@sqh0 ~]# ceph osd crush show-tunables
{
“choose_local_tries”: 0,
“choose_local_fallback_tries”: 0,
“choose_total_tries”: 50,
“chooseleaf_descend_once”: 1,
“chooseleaf_vary_r”: 1,
“chooseleaf_stable”: 1,
“straw_calc_version”: 1,
“allowed_bucket_algs”: 54,
“profile”: “jewel”,
“optimal_tunables”: 1,
“legacy_tunables”: 0,
“minimum_required_version”: “jewel”,
“require_feature_tunables”: 1,
“require_feature_tunables2”: 1,
“has_v2_rules”: 0,
“require_feature_tunables3”: 1,
“has_v3_rules”: 0,
“has_v4_buckets”: 1,
“require_feature_tunables5”: 1,
“has_v5_rules”: 0
}
发现 “require_feature_tunables5”: 1,该项变为1，猜想是该配置的原因。想要通过某种方式修改该配置，令它为0.
执行如下命令
解决方法
ceph osd crush tunables hammer
再执行ceph osd crush show-tunables
发现该配置项”require_feature_tunables5”: 0.
之后我在rbd map test_image
成功