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打造軟體定義儲存新局
應用Ceph技術
Alex Lau (劉俊賢)
Software Consultant
alau@suse.com
SUSE Enterprise Storage 4
SUSE 領先提供企業級 cephfs 及 iSCSI 連接
SES4.
用戶可以直接利用 TCP/IP 連接 iSCSI 協議和
cephfs.
iSCSI Target 驅動建立於RDB上
( RADOS block device ).
任何 iSCSI Initiator 可以經過網絡連接 SES4
基本 ceph 叢集
LIBRADOS
OSD MON
OSD
OSD
MON
MON
MDS
MDS
MDS
RADOS
對象
塊
文件
介面
CEPHFS
RDB
RADOSGW
介面:
‒ 對象
‒ 塊
‒ 文件
MON:
‒ 叢集Map
OSD:
‒ 對象數據
MDS:
‒ cephfs
Ceph Monitor
Paxos Role
Proposers
Acceptors
Learners
Leader
Mon
OSD
MAP
MON
MAP
PG
MAP
CRUSH
MAP
Paxos Service
Paxos
LevelDB
K/V K/V K/V
Log
…
ObjectStore Daemon
File
Store
OSD
OSDOSD OSD
PG PG PG PG …
Object Store
File
Store
FileJournal
DBObjectMap
低層IO操作
FileJournal:
‒ 數據完整
DBobjectMap:
‒ KeyValue map給寫功能
FileStore後台
File
Store
OSD
Disk Disk Disk
BtrfsXFS ext4
File
Store
OSD
File
Store
OSD
OSD MON
OSD
OSD
MON
MON
RADOS
OSD管理數據安全
所有寫操作在文件系統上:
‒ XFS, BTRFS
ACID:
‒ 保護數據
‒ Atomicity, Consistency,
Isolation, Durability
BlueFS
META
Dat
a
Dat
a
Dat
a
RocksDB
Allocator
Block Block Block
BlueStore後台 BlueStore
Rocksdb
‒ 對象Metadata
‒ ceph Key/Value數據
Block設備
‒ 數據直接讀寫
不再需要文件系統
‒ 寫操作減半
cephfs MeatData Server
OSD MON
OSD
OSD
MON
MON
MDS
MDS
MDS
RADOS
CephFS
Client
META
Data
DataData
MDS存數據在RADOS
‒ 文作, 目錄
POSIX文件系統相容上
不提供文件內容
只需要當使用cephfs
高可用性和可擴展性
Ceph 對象關口
LIBRADOS
OSD MON
OSD
OSD
MON
MON
RADOS
RADOSG
W
RADOSG
W
S3 API
Swift
API
RESTful 關口連接ceph
‒ S3 相容
‒ Swift 相容
CephFS
POSIX文件系統相容上
MDS存數據在RADOS
‒ 不提供文件內容
Linux 核心模塊和FUSE
高可用性和可擴展性
‒ Inline Data
‒ SnapShots
‒ 多個文件系統
libcephfs
librados
OSD MON
OSD
OSD
MON
MON
MDS
MDS
MDS
RADOS
FUSE cephfsKernel cephfs.ko
Block
Storage
File
System
Object
Storage
使用 ceph 存儲的方法?
SUSE 領先提供 iSCSI
Remote Cluster
Data Encrypted
at Rest
Monitor
Nodes
Management
Node
Heterogeneous
OS Access
RADOS
gateway
RESTful api
iSCSI
iSCSI 架構
技術背景
協議:
‒ 經過TCP/IP連接Block storage
‒ 任何iSCSI Initiators可以經過TCP/IP連接iSCSI Target
‒ iSCSI Targets,伺服器提供本地block訪問
SCSI and iSCSI:
‒ iSCSI 命令和回應打包裹
‒ iSCSI TCP包含SCSI命令
遠程存取:
‒ iSCSI Initiators可以把遠程的Block當作本地硬碟處理
‒ 存儲被連接後可以直接使用不同文件系統XFS, brtfs ….
‒ 用戶可以直接使用iSCSI Target始動
Public
Network
OSD1 OSD2 OSD3 OSD4
iSCSI RBD沒有驅動前…
Target System
RBD Block LIO to ISCSI
Initiator System
iSCSI 加 LIO 有什麼問題?
缺少一些功能
LIO over RBD:
‒ 不支持 “atomic compare and write”
‒ 不支持 “persistent group reservations”
iSCSI:
‒ 不支持 iSCSI Active/Active Multiple Path MPIO
iSCSI LIO 在 RBD 驅動上的優點
支持更多的系統平台連接 ceph:
‒ 不需要成為叢集的一部份像 radosgw 一樣
標準 iSCSI 介面:
‒ 大部份操集系統支持 iSCSI Initiators
LIO Linux IO Target:
‒ Linux 核心實作 iSCSI Target
靈活的組態:
‒ Targetcli 經過 lrbd 工具動態設定
設定 RBD iSCSI 入口
介紹 lrbd
易用建立:
‒ 由開始 SES2.0 已經支持 iSCSI
‒ Targetcli支持多點設定
技術背景:
‒ JSON 格式
‒ Target, Portals, Pools, Auth
‒ 設定狀態保存在 ceph 叢集內
Related Link:
‒ https://github.com/swiftgist/lrbd
‒ https://github.com/swiftgist/lrbd/wiki
19
Public Network
OSD1 OSD2 OSD3 OSD4
Multiple Path 支持 iSCSI RBD
Cluster Network
iSCSI Gateway
RBD
Module
iSCSI Gateway
RBD
Module
iSCSI Initiator
RBD image
如何管理 ceph 存儲的增長和費用?
Easily scale and
manage data
storage
Control storage
growth and
manage costs
Support today’s
investment and
adapt to the future
$
介紹 openATTIC
Easily scale and
manage data
storage
SUSE Enterprise Storage 管理工具
前景
開源項目:
‒ 替代專用存儲管理系統
企業級應用:
‒ 支持傳統存儲管理, 使用統一介面 e.g. NAS, SAN
SDS 支持:
‒ 支持 ceph 的管理和監視叢集狀態, 簡化 ceph 複雜的操作
openATTIC 功能
現有功能
現在的網頁介面
RESTful API
‒ Software Defined Storage
統一存儲
‒ NAS (NFS, CIFS, HTTP)
‒ SAN (iSCSI, Fiber
Channel)
卷鏡像
‒ DRBD
文件系統
‒ LVM, XFS, Btrfs, ext3/4
監控
‒ 內置Nagios / Icinga
‒ ceph 管理 (WIP)
openATTIC 架構
技術內容
後台:
‒ Python (Django)
‒ Django REST Framework
‒ Nagios / Icinga &
PNP4Nagios
‒ Linux tools
‒ LVM, LIO, DRBD
‒ ceph API
‒ librados, librbd
網頁前台:
‒ AngularJS
‒ Bootstrap
‒ REST API
自動化測試
‒ Python unit tests
‒ Gatling
‒ RESTful API
‒ Protractor / Jasmine
‒ WebUI test
openATTIC 架構
概述
Django
Linux OS
Tools
openATTIC
SYSTEMD
RESTful API
PostgreSQL
DBUS
Shell
librados/li
brbd
Web UI REST
Client
HTTP
NoDB
如何管理 ceph 的費用?
Control storage
growth and
manage costs
$
最低硬體建議
OSD Storage Node
‒ 2GB RAM per OSD
‒ 1.5GHz CPU core per
OSD
‒ 10GEb public and
backend
‒ 4GB RAM for cache tier
MON Monitor Node
‒ 3 Mons minimal
‒ 2GB RAM per node
‒ SSD System OS
‒ Mon and OSD should not
be virtualized
‒ Bonding 10GEb
SUSE 存儲價格
JBOD Storage
Mid-range
Array
Mid-range
NAS
High-end
Disk Array
SUSE企業存儲
Fully
Featured
NAS Device
Entry-level
Disk Array
Thin Provisioning
隨需配置
傳統存儲配置 SDS隨需配置
Data
Allocated
Data
Allocated
Volume A
Volume B
Data
Data
Available
Storage
Volume A
Volume B
多層次的使用 ceph 存儲
需要快寫的應用:
• e.g. 視像數據
• e.g. 很多IoT數據
需要快讀的應用:
• e.g.視像流傳播
• e.g.大數據分析
快寫層
Hot Pool
一般層
Cold Pool
快讀層
Hot Pool
SUSE Enterprise Storage Cluster
一般層
Cold Pool
如何計算多個存儲價格?
1000$ = 1000G 2000MB rw
4 PCIe = 4000$ = 8000MB rw
4T Storage 400,000 IOPS
4$ per G
250$ = 1000G, 500MB rw
16 Driver = 4000$ = 8000MB rw
16T Storage 100,000 IOPS
1$ per G
250$ = 8000G 150MB rw
16 Driver = 4000$ = 2400MB rw
128T Storage 2000 IOPS
0.1$ per G
Control Costs
如何使用EC減低存儲費用? $
Copy Copy Copy
Replication Pool
SES CEPH CLUSTSER
Control Costs
Erasure Coded Pool
SES CEPH CLUSTSER
多點複製數據
• 300%數據空間使用
• 低延遲,快恢復
一份數據加奇偶校驗數據
• 120%數據空間使用
• CPU差換數據恢復
Data Data Data Data
Parity Parity
Data Data Data Data
Data Data
公有雲對比私有雲 ceph 使用
H270-H70 – 40000$美金
- 48 Core * 8 : 384 核心
- 32G * 32: 1T 記億體
- 1T * 16: 16T SSD
- 40GbE * 8
R120-T30 – 5700$美金 * 7
- 48 Core * 7 : 336 核心
- 8 * 16G * 7 : 896G 記億體
- 1T * 2 * 7 : 14T SSD
- 8T * 6 * 7 : 336T HDD
- 40GbE * 7
- 10GbE * 14
1000 用戶使用
5$ - 網站 = 5000$ 美金
8個月= 40000$ 美金
EC 5+2大約等於250T
2500用戶使用100GB
2$存儲= 5000$
8個月= 40000$
ceph 開發者 / POC
OSD1
OSD2
OSD3
OSD4
MON1
OSD5
OSD6
OSD7
OSD8
MON2
OSD9
OSD10
OSD11
OSD12
MON3
Dual 1G Network
300$ 300$
6T = 220$
220 * 3 = 660$
512G = 150$
300$
6T = 220$
220 * 3 = 660$
512G = 150$
6T = 220$
220 * 3 = 660$
512G = 150$
DevOps的故事?
介紹salt
Support today’s
investment and
adapt to the future
Salt加強ceph維護
功能
DeepSea
‒ https://github.com/SUSE/DeepSea
‒ Salt state 文件幫助管理及建立ceph
產品支持
‒ SUSE OpenStack cloud, SUSE manager
‒ SUSE Enterprise Storage
並行操作
客制化模塊
靈活設計
‒ Default Jinja2 + YAML ( stateconf )
‒ Pydsl if you like python directly, json, pyobject, etc
ceph叢集快速安裝例子
Git repo for fast deploy and benchmark
 https://github.com/AvengerMoJo/Ceph-Saltstack
Demo recording
 https://asciinema.org/a/4hmdsrksn0fd8fgpssdgqsjdb
1) Salt基本設定
2) Git clone拷貝模塊到salt的_modules目錄
3) Saltutil.sync_all到所有minion系統節點
4) ntp_update更新所有統節點
5) 創造MONs節點和集的keys
6) 系統清除硬碟分區及預備OSD
7) Crushmap及RADOSGW設定
SUSE Enterprise Storage減低存儲用費用和
管理成本
減低管理
加快相容
控制成本
應用Ceph技術打造軟體定義儲存新局

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