Jim, I am not an expert, but I believe I can assist. Normally you will only have 1 OSD per drive. I have heard discussions about using multiple OSDs per disk, when using SSDs though. Once your drives have been installed you will have to format them, unless you are using Bluestore. My steps for formatting are below. Replace the sXX with your drive name. parted -a optimal /dev/sXX print mklabel gpt unit mib mkpart OSD4sdd1 1 -1 quit mkfs.xfs -f /dev/sXX1 # Run blkid, and copy the UUID for the newly formatted drive. blkid # Add the mount point/UUID to fstab. The mount point will be created later. vi /etc/fstab # For example UUID=6386bac4-7fef-3cd2-7d64-13db51d83b12 /var/lib/ceph/osd/ceph-4 xfs rw,noatime,inode64,logbufs=8 0 0 # You can then add the OSD to the cluster. uuidgen # Replace the UUID below with the UUID that was created with uuidgen. ceph osd create 23e734d7-96d8-4327-a2b9-0fbdc72ed8f1 # Notice what number of osd it creates usually the lowest # OSD available. # Add osd.4 to ceph.conf on all Ceph nodes. vi /etc/ceph/ceph.conf ... [osd.4] public addr = 172.1.3.1 cluster addr = 10.1.3.1 ... # Now add the mount point. mkdir -p /var/lib/ceph/osd/ceph-4 chown -R ceph:ceph /var/lib/ceph/osd/ceph-4 # The command below mounts everything in fstab. mount -a # The number after -i below needs changed to the correct OSD ID, and the osd-uuid needs to be changed the UUID created with uuidgen above. Your keyring location may be different and need changed as well. ceph-osd -i 4 --mkfs --mkkey --osd-uuid 23e734d7-96d8-4327-a2b9-0fbdc72ed8f1 chown -R ceph:ceph /var/lib/ceph/osd/ceph-4 ceph auth add osd.4 osd 'allow *' mon 'allow profile osd' -i /etc/ceph/ceph.osd.4.keyring # Add the new OSD to its host in the crush map. ceph osd crush add osd.4 .0 host=YOURhostNAME # Since the weight used in the previous step was .0, you will need to increase it. I use 1 for a 1TB drive and 5 for a 5TB drive. The command below will reweight osd.4 to 1. You may need to slowly ramp up this number. ie .10 then .20 etc. ceph osd crush reweight osd.4 1 You should now be able to start the drive. You can watch the data move to the drive with a ceph -w. Once data has migrated to the drive, start the next. Cary -Dynamic On Thu, Dec 14, 2017 at 5:34 PM, James Okken <James.Okken@xxxxxxxxxxxx> wrote: > Hi all, > > Please let me know if I am missing steps or using the wrong steps > > I'm hoping to expand my small CEPH cluster by adding 4TB hard drives to each of the 3 servers in the cluster. > > I also need to change my replication factor from 1 to 3. > This is part of an Openstack environment deployed by Fuel and I had foolishly set my replication factor to 1 in the Fuel settings before deploy. I know this would have been done better at the beginning. I do want to keep the current cluster and not start over. I know this is going thrash my cluster for a while replicating, but there isn't too much data on it yet. > > > To start I need to safely turn off each CEPH server and add in the 4TB drive: > To do that I am going to run: > ceph osd set noout > systemctl stop ceph-osd@1 (or 2 or 3 on the other servers) > ceph osd tree (to verify it is down) > poweroff, install the 4TB drive, bootup again > ceph osd unset noout > > > > Next step wouyld be to get CEPH to use the 4TB drives. Each CEPH server already has a 836GB OSD. > > ceph> osd df > ID WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS > 0 0.81689 1.00000 836G 101G 734G 12.16 0.90 167 > 1 0.81689 1.00000 836G 115G 721G 13.76 1.02 166 > 2 0.81689 1.00000 836G 121G 715G 14.49 1.08 179 > TOTAL 2509G 338G 2171G 13.47 > MIN/MAX VAR: 0.90/1.08 STDDEV: 0.97 > > ceph> df > GLOBAL: > SIZE AVAIL RAW USED %RAW USED > 2509G 2171G 338G 13.47 > POOLS: > NAME ID USED %USED MAX AVAIL OBJECTS > rbd 0 0 0 2145G 0 > images 1 216G 9.15 2145G 27745 > backups 2 0 0 2145G 0 > volumes 3 114G 5.07 2145G 29717 > compute 4 0 0 2145G 0 > > > Once I get the 4TB drive into each CEPH server should I look to increasing the current OSD (ie: to 4836GB)? > Or create a second 4000GB OSD on each CEPH server? > If I am going to create a second OSD on each CEPH server I hope to use this doc: > http://docs.ceph.com/docs/master/rados/operations/add-or-rm-osds/ > > > > As far as changing the replication factor from 1 to 3: > Here are my pools now: > > ceph osd pool ls detail > pool 0 'rbd' replicated size 1 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 flags hashpspool stripe_width 0 > pool 1 'images' replicated size 1 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 116 flags hashpspool stripe_width 0 > removed_snaps [1~3,b~6,12~8,20~2,24~6,2b~8,34~2,37~20] > pool 2 'backups' replicated size 1 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 7 flags hashpspool stripe_width 0 > pool 3 'volumes' replicated size 1 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 256 pgp_num 256 last_change 73 flags hashpspool stripe_width 0 > removed_snaps [1~3] > pool 4 'compute' replicated size 1 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 34 flags hashpspool stripe_width 0 > > I plan on using these steps I saw online: > ceph osd pool set rbd size 3 > ceph -s (Verify that replication completes successfully) > ceph osd pool set images size 3 > ceph -s > ceph osd pool set backups size 3 > ceph -s > ceph osd pool set volumes size 3 > ceph -s > > > please let me know any advice or better methods... > > thanks > > --Jim > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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