NetApp FAS系列存储架构 ppt课件

NetApp – © 2008, NetApp – All rights reserved
9
Read Requests
✓ Data ONTAP ✓ Writes ➢ Reads
Every time a read request is received, WAFL determines whether to either:
If system failure occurs before the completion of the consistency point:
– then data is written from NVRAM when the system is brought back online or by the partner machine in an active-active environment
– CIFS
– NFS
– FCP
– iSCSI
– HTTP
– WebDAV
Write requests are buffered into
– System memory
– NVRAM
NetApp – © 2008, NetApp – All rights reserved
4
Data Flow: Write Request – Write Buffer
V
NVLOG
R
NVLOG
A
NVLOG
M
NVRAM Full
WAFL
RAID
Storage
NetApp – © 2008, NetApp – All rights reserved
5
Data Flow: Write Request – WAFL to RAID
Network
SAN Host
UNIX Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
WAFL
RAID
4K
Storage
NetApp – © 2008, NetApp – All rights reserved
7
Data Flow: Write Request – Storage Writes
Network SAN Host
– Describe the WAFL , including consistency points, RAID management, and storage levels
– Describe how RAID is used to protect disk data – Describe how the WAFL processes write and
Client
Client Client
Physical Memory
NVRAM
Disks
NetApp – © 2008, NetApp – All rights reserved
3
Write Requests
✓ Data ONTAP ➢ Writes • Reads
Write requests come into Data ONTAP through a variety of different interface protocols
Tag line, tag line
Write and Read Request Processing
Data ONTAP Fundamentals
Objectives
At the end of this module, you will be able to:
– Describe the writing and reading of data to and from a WAFL on a volume
NetApp – © 2008, NetApp – All rights reserved
8
NVRAM
Data ONTAP writes from system memory
– Note: NVRAM is never used for normal write operations
– NVRAM is backed up with a battery
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
Rwenku.baidu.com
NVLOG
A
NVLOG
M
WAFL
RAID
Storage
NetApp – © 2008, NetApp – All rights reserved
6
Data Flow: Write Request – RAID to Storage
Network SAN Host
UNIX Client
Network Stack
Protocols
RS-232
SAN Service
HBA
NFS Service
CIFS Service
Windows Client
Network
SAN Host
ACK ACK
UNIX Client
ACK ACK
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
Windows Client
ACK
Memory Buffer
NVLOG
N
NVLOG
read requests
NetApp – © 2008, NetApp – All rights reserved
2
Data ONTAP Simplified
➢ Data ONTAP • Writes • Reads
Network
Client Client
Data ONTAP
Network Protocols WAFL RAID Storage
– Read the data from the system memory (aka cache)
UNIX Client
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
WAFL
RAID
Windows Client
Storage