h1. Management Cluster Ceph

h2. Ajout d'un OSD classique

<pre>

$ 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.

</pre>

Pour un HDD: 

<pre>

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

</pre>

Pour un SSD:

<pre>

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

</pre>

Ensuite, autoriser Ceph à mettre des data dessus:

<pre>

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

</pre>

h2. 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):

<pre>

apt-get install partprobe

fdisk /dev/sda

n

p

<enter>

<enter>

<enter>

<enter>

w

$ partprobe

</pre>

Ubuntu (GPT format):

<pre>

# 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.

</pre>

On prepare le disk comme normalement

<pre>

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

</pre>

Ensuite, autoriser Ceph à mettre des data dessus:

<pre>

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

</pre>

h2. Suppression d'un OSD:

<pre>

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

</pre>

h2. Remplacement à froid d'un tier cache:

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

<pre>

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

</pre>