tl;dr to get a ceph journal to work with udev rules run this command substituting your device name (/dev/sdb) and partition number used twice (=4).
sgdisk /dev/sdb -t=4:45B0969E-9B03-4F30-B4C6-5EC00CEFF106 -c=4:'ceph journal'
And this for your osds replacing the device name (/dev/sdc) and partition number used twice (=1).
sgdisk /dev/sdc -t=1:4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D -c=1:'ceph data'
At the bottom is the relevant information from a printout of sgdisk for journal and osd partitions that are configured properly to have the udev rules manage the devices properly.
The "Partition unique GUID" is different for every disk. Generally this is auto-assigned, but you can specify it if you'd like. A time when it is really nice to specify is if you are swapping out a failing journal device. You can recreate the new partitions with the same GUIDS and if you set up your /var/lib/ceph/osd/ceph-##/journal symlink to use that guid (ie /dev/disk/by-partuuid/053f386f-223c-43a2-9843-6462dfb3857a for my /dev/sdb4 journal partition) then you won't need to make any changes on the OSD when you swap it out (other than the commands to flush and create the journal).
The "Partition name" is just nice to have to easily be able to tell what a disk was used for if you throw it on a stack one day. It isn't necessary, but nice. 'ceph journal' and 'ceph data' are the defaults that the ceph-deploy script will do, so it's also nice to match those anyway.
The real key to getting the udev rules to work is the "Partition GUID code". A ceph journal should always have 45B0969E-9B03-4F30-B4C6-5EC00CEFF106 as its "Partition GUID code" and a ceph osd should always have 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D. That is hardcoded into the udev rules that ceph installs and has not changed ever that I'm aware of.
Partition GUID code: 45B0969E-9B03-4F30-B4C6-5EC00CEFF106 (Unknown)
Partition unique GUID: 053F386F-223C-43A2-9843-6462DFB3857A
Partition name: 'ceph journal'
# sgdisk /dev/sdb -i=5
Partition GUID code: 45B0969E-9B03-4F30-B4C6-5EC00CEFF106 (Unknown)
Partition unique GUID: 6448D160-A2B7-4EF9-BC67-12F4D49D9FDD
Attribute flags: 0000000000000000
Partition name: 'ceph journal'
root@ceph1:~# sgdisk /dev/sdc -i=1
Partition GUID code: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D (Unknown)
Partition unique GUID: 036FCF9D-2865-4822-9F93-94C3B5750DDC
Partition name: 'ceph data'
root@ceph1:~# sgdisk /dev/sdd -i=1
Partition GUID code: 4FBD7E29-9D25-41B8-AFD0-062C0CEFF05D (Unknown)
Partition unique GUID: D74AB67E-C7F6-4974-889F-ABEBA7F2DC2F
Partition name: 'ceph data'
On Wed, Jun 14, 2017 at 4:02 AM nokia ceph <nokiacephusers@xxxxxxxxx> wrote:
Hello David,Thanks for the update.http://tracker.ceph.com/issues/13833#note-7 - As per this tracker they mentioned that the GUID may differ which cause udev were unable to chown ceph.We are following below procedure to create OSD's#sgdisk -Z /dev/sdb#ceph-disk prepare --bluestore --cluster ceph --cluster-uuid <fsid> /dev/vdb#ceph-disk --verbose activate /dev/vdb1Here you can see all the device haiving same GUID.#for i in b c d ; do /usr/sbin/blkid -o udev -p /dev/vd$i\1 | grep ID_PART_ENTRY_TYPE; doneID_PART_ENTRY_TYPE=4fbd7e29-9d25-41b8-afd0-062c0ceff05dID_PART_ENTRY_TYPE=4fbd7e29-9d25-41b8-afd0-062c0ceff05dID_PART_ENTRY_TYPE=4fbd7e29-9d25-41b8-afd0-062c0ceff05dCurrently we are facing issue with the OSD activation while boot. which caused the OSD journal device mounted like this..~~~/dev/sdh1 /var/lib/ceph/tmp/mnt.EayTmL~~~At the same time on OSD logs, we getting like, osd.2 can't able to find the mounted journal device hence it landed into failure state..~~~May 26 15:40:39 cn1 ceph-osd: 2017-05-26 15:40:39.978072 7f1dc3bc2940 -1 #033[0;31m ** ERROR: unable to open OSD superblock on /var/lib/ceph/osd/ceph-2: (2) No such file or directory#033[0mMay 26 15:40:39 cn1 systemd: ceph-osd@2.service: main process exited, code=exited, status=1/FAILUREMay 26 15:40:39 cn1 systemd: Unit ceph-osd@2.service entered failed state.May 26 15:40:39 cn1 systemd: ceph-osd@2.service failed.~~~To fix this problem, we are following below workaround...#umount /var/lib/ceph/tmp/mnt.om4LbqMount the device with respective osd number.#mount /dev/sdb1 /var/lib/ceph/osd/ceph-2Then start the osd.#systemctl start ceph-osd@2.service.We notice below services fail at the same time.===systemctl --failedUNIT LOAD ACTIVE SUB DESCRIPTION● var-lib-ceph-tmp-mnt.UiCYFu.mount not-found failed failed var-lib-ceph-tmp-mnt.UiCYFu.mount● ceph-disk@dev-sdc1.service loaded failed failed Ceph disk activation: /dev/sdc1● ceph-disk@dev-sdd1.service loaded failed failed Ceph disk activation: /dev/sdd1● ceph-disk@dev-sdd2.service loaded failed failed Ceph disk activation: /dev/sdd2===Need your suggestion to proceed furtherThanksJayaramOn Tue, Jun 13, 2017 at 7:30 PM, David Turner <drakonstein@xxxxxxxxx> wrote:I came across this a few times. My problem was with journals I set up by myself. I didn't give them the proper GUID partition type ID so the udev rules didn't know how to make sure the partition looked correct. What the udev rules were unable to do was chown the journal block device as ceph:ceph so that it could be opened by the Ceph user. You can test by chowning the journal block device and try to start the OSD again.Alternatively if you want to see more information, you can start the daemon manually as opposed to starting it through systemd and see what its output looks like.On Tue, Jun 13, 2017 at 6:32 AM nokia ceph <nokiacephusers@xxxxxxxxx> wrote:_______________________________________________Hello,Some osd's not getting activated after a reboot operation which cause that particular osd's landing in failed state.Here you can see mount points were not getting updated to osd-num and mounted as a incorrect mount point, which caused osd.<num> can't able to mount/activate the osd's.Env:- RHEL 7.2 - EC 4+1, v11.2.0 bluestore.#grep mnt proc/mounts/dev/sdh1 /var/lib/ceph/tmp/mnt.om4Lbq xfs rw,noatime,attr2,inode64,sunit=512,swidth=512,noquota 0 0/dev/sdh1 /var/lib/ceph/tmp/mnt.EayTmL xfs rw,noatime,attr2,inode64,sunit=512,swidth=512,noquota 0 0From /var/log/messages..--May 26 15:39:58 cn1 systemd: Starting Ceph disk activation: /dev/sdh2...May 26 15:39:58 cn1 systemd: Starting Ceph disk activation: /dev/sdh1...May 26 15:39:58 cn1 systemd: start request repeated too quickly for ceph-disk@dev-sdh2.service => suspecting this could be root cause.May 26 15:39:58 cn1 systemd: Failed to start Ceph disk activation: /dev/sdh2.May 26 15:39:58 cn1 systemd: Unit ceph-disk@dev-sdh2.service entered failed state.May 26 15:39:58 cn1 systemd: ceph-disk@dev-sdh2.service failed.May 26 15:39:58 cn1 systemd: start request repeated too quickly for ceph-disk@dev-sdh1.serviceMay 26 15:39:58 cn1 systemd: Failed to start Ceph disk activation: /dev/sdh1.May 26 15:39:58 cn1 systemd: Unit ceph-disk@dev-sdh1.service entered failed state.May 26 15:39:58 cn1 systemd: ceph-disk@dev-sdh1.service failed.--But this issue will occur intermittently after a reboot operation.Note;- We haven't face this problem in Jewel.Awaiting for comments.ThanksJayaram
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