NetApp FAS系列存储架构 ppt课件
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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
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
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
– 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
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:
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
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
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
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
– Read the data from the system memory (aka cache)
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
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
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
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
RNVLOGFra bibliotekANVLOG
M
WAFL
RAID
Storage
NetApp – © 2008, NetApp – All rights reserved
– then data is written from NVRAM when the system is brought back online or by the partner machine in an active-active environment
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
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
– 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
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:
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
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
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
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
– Read the data from the system memory (aka cache)
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
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
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
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
RNVLOGFra bibliotekANVLOG
M
WAFL
RAID
Storage
NetApp – © 2008, NetApp – All rights reserved