* 更换故障盘
1. 查看故障盘osd id
ceph osd tree
2. 销毁osd
ceph osd destroy 7 --yes-i-really-mean-it
3. 更换故障硬盘
4. 查看硬盘盘符
lsblk
5. 清除硬盘
ceph-volume lvm zap /dev/sdg --destroy
6. 预备&替换原osd
ceph-volume lvm prepare --osd-id 7 --data /dev/sdg
7. 查看osd fsid
cat /var/lib/ceph/osd/ceph-7/fsid
8. 激活osd
ceph-volume lvm activate 7 fc43ff34-0abe-4e15-8964-3a2b2e77059a
* 手工方式扩容osd节点
1. node admin
ssh-copy-id -i .ssh/id_rsa.pub vm-208
/etc/hosts添加 '192.168.100.208 vm-208'解析
传送ceph节点 ansible -i inventory all -m copy -a 'src=/etc/hosts dest=/etc/hosts'
2. node vm-208
scp vm-205:/etc/yum.repos.d/ceph_stable.repo /etc/yum.repos.d/ceph_stable.repo
scp vm-205:/etc/ceph/ceph.conf /etc/ceph
scp vm-205:/etc/ceph/ceph.client.admin.keyring /etc/ceph
scp vm-205:/var/lib/ceph/bootstrap-osd/ceph.keyring /var/lib/ceph/bootstrap-osd
pip3 install pip -U
pip3 config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip3 install six pyyaml
yum install -y ceph-osd
lsblk
ceph-volume lvm zap /dev/sdb --destroy
ceph-volume lvm zap /dev/sdc --destroy
ceph-volume lvm zap /dev/sdd --destroy
ceph-volume lvm zap /dev/sde --destroy
ceph-volume lvm zap /dev/sdf --destroy
ceph-volume lvm zap /dev/sdg --destroy
ceph-volume lvm create --data /dev/sdb --bluestore --block.db /dev/sdf --block.wal /dev/sdg --block.db-size 2.5G --block.wal-size 2.5G
ceph-volume lvm create --data /dev/sdc --bluestore --block.db /dev/sdf --block.wal /dev/sdg --block.db-size 2.5G --block.wal-size 2.5G
ceph-volume lvm create --data /dev/sdd --bluestore --block.db /dev/sdf --block.wal /dev/sdg --block.db-size 2.5G --block.wal-size 2.5G
ceph-volume lvm create --data /dev/sde --bluestore --block.db /dev/sdf --block.wal /dev/sdg --block.db-size 2.5G --block.wal-size 2.5G
* 手工方式缩容osd节点
1. 停止所有osd服务
systemctl stop ceph-osd@12
systemctl stop ceph-osd@13
systemctl stop ceph-osd@14
systemctl stop ceph-osd@15
2. 销毁所有osd
ceph osd purge 12 --yes-i-really-mean-it
ceph osd purge 13 --yes-i-really-mean-it
ceph osd purge 14 --yes-i-really-mean-it
ceph osd purge 15 --yes-i-really-mean-it
3. 清除磁盘数据
ceph-volume lvm zap --osd-id 12 --destroy
ceph-volume lvm zap --osd-id 13 --destroy
ceph-volume lvm zap --osd-id 14 --destroy
ceph-volume lvm zap --osd-id 15 --destroy
4. 清除crush数据
ceph osd crush tree
ceph osd crush rm vm-208
5. 删除osd应用
yum remove -y ceph-osd ceph-common
* 调整PG
# warn: 1 pools have too many placement groups
扩容&缩容后，osd数量变化，需要调整各个pool的pg数，参照公式
Total PGs = ((Total_number_of_OSD * 100) / max_replication_count) / pool_count， 结算的结果往上取靠近2的N次方的值。
ceph osd lspools
ceph osd pool get test pg_num
ceph osd pool get test pgp_num
ceph osd dump |grep size|grep test
ceph osd pool set test pg_num 64
ceph osd pool set test pgp_num 64
# 参考 https://docs.ceph.com/en/pacific/rados/operations/placement-groups
报警提示：1 daemons have recently crashed
处理：
ceph crash ls-new
ceph crash info
ceph crash archive-all