Management Cluster Ceph¶

Ajout d'un OSD classique¶

$ ceph-disk prepare --zap-disk --cluster-uuid 1fe74663-8dfa-486c-bb80-3bd94c90c967 --fs-type=xfs /dev/sdX
$ smartctl --smart=on /dev/sdX  # Pour le monitoring.

Pour un HDD:

$ ceph osd crush add osd.<ID> 0 root=default host=g3

Pour un SSD:

$ ceph osd crush add osd.<ID> 0 root=ssd host=g3-ssd

Ensuite, autoriser Ceph à mettre des data dessus:

$ /root/tools/ceph-reweight-osds.sh osd.<ID>

Ajout d'un OSD qui partage le SSD avec l'OS¶

En général avec ceph, on donne un disque, ceph créé 2 partitions une pour le journal de l'OSD, l'autre pour les datas
mais pour le SSD de tetaneutral qui a aussi l'OS, voici la méthode

Création manuelle de la partition de data ceph /dev/sda2 ici

Debian (MBR format):

apt-get install partprobe
fdisk /dev/sda

n
p
<enter>
<enter>
<enter>
<enter>
w

$ partprobe

Ubuntu (GPT format):

# parted /dev/sdb
GNU Parted 2.3
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: ATA SAMSUNG MZ7KM480 (scsi)
Disk /dev/sdb: 480GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  20.0GB  20.0GB  primary  ext4            boot
 2      20.0GB  36.0GB  16.0GB  primary  linux-swap(v1)

(parted) mkpart                                                           
Partition type?  primary/extended?                                        
Partition type?  primary/extended? primary
File system type?  [ext2]? xfs                                            
Start?                                                                    
Start? 36.0GB                                                             
End? 100%                                                                 
(parted) print                                                            
Model: ATA SAMSUNG MZ7KM480 (scsi)
Disk /dev/sdb: 480GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  20.0GB  20.0GB  primary  ext4            boot
 2      20.0GB  36.0GB  16.0GB  primary  linux-swap(v1)
 3      36.0GB  480GB   444GB   primary

(parted) quit                                                             
Information: You may need to update /etc/fstab.

On prepare le disk comme normalement

ceph-disk prepare --fs-type=xfs --cluster-uuid 1fe74663-8dfa-486c-bb80-3bd94c90c967 /dev/sda2
ceph-disk activate /dev/sda2
ceph osd crush add osd.<ID> 0 root=ssd host=g3-ssd

Ensuite, autoriser Ceph à mettre des data dessus:

$ /root/tools/ceph-reweight-osds.sh osd.<ID>

Suppression d'un OSD:¶

name="osd.2" 
ceph osd out ${name}
stop ceph-osd id=${name#osd.} # ou sous debian: /etc/init.d/ceph stop ${name}
ceph osd crush remove ${name}
ceph auth del ${name}
ceph osd rm ${name}
ceph osd tree

Remplacement à froid d'un tier cache:¶

upstream doc: http://docs.ceph.com/docs/master/rados/operations/cache-tiering/

ceph osd tier cache-mode ec8p2c forward
rados -p ec8p2c cache-flush-evict-all
ceph osd tier remove-overlay ec8p2
ceph osd tier remove ec8p2 ec8p2c

rados rmpool ec8p2c ec8p2c  --yes-i-really-really-mean-ita
ceph osd pool create ec8p2c 128 128 replicated

ceph osd tier add ec8p2 ec8p2c
ceph osd tier cache-mode ec8p2c writeback
ceph osd tier set-overlay ec8p2 ec8p2c

ceph osd pool set ec8p2c size 3
ceph osd pool set ec8p2c min_size 2
ceph osd pool set ec8p2c hit_set_type bloom

ceph osd pool set ec8p2c hit_set_count 1
ceph osd pool set ec8p2c hit_set_period 3600
ceph osd pool set ec8p2c target_max_bytes 200000000000
ceph osd pool set ec8p2c target_max_objects 10000000
ceph osd pool set ec8p2c cache_target_dirty_ratio 0.4
ceph osd pool set ec8p2c cache_target_full_ratio 0.8