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canonical / microceph

Ceph for a one-rack cluster and appliances
https://snapcraft.io/microceph
GNU Affero General Public License v3.0
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permission denied error for disk add on an external usb hdd #343

Closed saurabhkumar closed 2 months ago

saurabhkumar commented 2 months ago

Issue report

What version of MicroCeph are you using ?

snap-id: ct1DgtIGBaljdOwomQGMLr8EJcL5pOP1 tracking: latest/edge refresh-date: yesterday at 21:48 CEST hold: forever channels: reef/stable: 18.2.0+snap450240f5dd 2024-04-09 (979) 78MB - reef/candidate: 18.2.0+snap71f71782c5 2024-04-22 (982) 78MB - reef/beta: ↑ reef/edge: 18.2.0+snap71f71782c5 2024-04-08 (982) 78MB - latest/stable: 18.2.0+snap450240f5dd 2024-04-09 (979) 78MB - latest/candidate: 18.2.0+snap71f71782c5 2024-04-22 (982) 78MB - latest/beta: ↑ latest/edge: 18.2.0+snap71f71782c5 2024-04-08 (982) 78MB - quincy/stable: 0+git.4a608fc 2024-01-10 (795) 86MB - quincy/candidate: 0+git.4a608fc 2023-11-30 (795) 86MB - quincy/beta: ↑ quincy/edge: 0+git.287ee68 2023-12-05 (809) 86MB - installed: 18.2.0+snap71f71782c5 (982) 78MB held

What are the steps to reproduce this issue ?

I installed microceph for experimentation on a raspberry pi cluster with 3 nodes and each node having an external usb hard disk (NTFS). After adding the nodes, issuing sudo microceph cluster list shows that the nodes are online.

On one of the nodes, lsblk | grep -v loop shows the following:

sda 8:0 0 465.8G 0 disk └─sda1 8:1 0 465.8G 0 part /mnt/drive1 mmcblk0 179:0 0 119.1G 0 disk ├─mmcblk0p1 179:1 0 512M 0 part /boot/firmware └─mmcblk0p2 179:2 0 118.6G 0 part /snap / I modified permission using sudo chmod 777 /mnt/drive1 (the disk is usable and the fstab file has also been modified to mount it at startup and this works)

What happens (observed behaviour) ?

The command sudo microceph disk add /dev/sda1 --wipe gives the following error:

+-----------+---------+ | PATH | STATUS | +-----------+---------+ | /dev/sda1 | Failure | +-----------+---------+ Error: failed to prepare data device: failed to wipe device /dev/disk/by-id/wwn-0x3020221222205440-part1: Failed to run: dd if=/dev/zero of=/dev/disk/by-id/wwn-0x3020221222205440-part1 bs=4M count=10 status=none: exit status 1 (dd: failed to open '/dev/disk/by-id/wwn-0x3020221222205440-part1': Permission denied)

What were you expecting to happen ?

The disk should get added.

UtkarshBhatthere commented 2 months ago

FWIR, at the moment, MicroCeph does not support enrolling partitioned disks as OSDs. You can however, create loop back block devices with backing files kept in the external drive and then enroll the loop devices as OSDs.

saurabhkumar commented 2 months ago

Thank you for the info.