"Failed to execute command" Displayed When Creating OSDs on Ceph
Symptom
Environment settings
Category |
Item |
Version |
|---|---|---|
Hardware |
CPU |
Kunpeng 920 processor |
Network |
Ethernet-10GE |
|
Storage |
3 x 480 GB SSD |
|
Memory |
1024 GB |
|
OS |
CentOS |
7.6 |
Kernel |
4.14.0 |
|
Software |
ceph-deploy |
2.0.0 |
Python |
2.7 |
Problem description: When the ceph-deploy osd create ceph1 --data /dev/bcache0 --block-db /dev/sdb1 --block-wal /dev/sdb2 command is executed to create an OSD, the message "OSError: [Error 2] No such file or directory: '/var/lib/ceph/osd/ceph-0'......[ceph1][ERROR ]RuntimeError: command returned non-zero exit status: 1 [cpeh_deploy.osd][ERROR ] Failed to execute command:/usr/sbin/ceph-volume --cluster ceph lvm create --bluestore --data /dev/bcache0 --block.wal /dev/sdb2 --block.db /dev/sdb1" is displayed.
Key Process and Cause Analysis
- Cause 1: The /var/lib/ceph/osd/ceph-0 file does not exist.
- Cause 2: The WAL and DB drives are partitioned using the fdisk /dev/sdb command.
Conclusion and Solution
- For cause 1, manually create the file.
mkdir -p /var/lib/ceph/osd/ceph-0
- For cause 2, you are advised to use the parted utility to create partitions as follows:
parted -s /dev/sdb mklabel gpt parted /dev/sdb mkpart primary xfs 2048s 240000 ### Partition 1, 240 GB parted /dev/sdb mkpart primary xfs 240000 480000 ### Partition 2, 240 GB