NetApp FAS系列存储架构PPT课件
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The cache is populated by:
– Data that recently was written to disk – Data that recently was read from disk
.
10
Data Flow: Read Request –Cache
Network
SAN Host
Network Stack
Protocols
RS-232
SAN Service
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
UNIX Client
HBA NIC
NFS Service
CIFS Service
Every time a read request is received, WAFL determines whether to either:
– Read the data from the system memory (aka cache)
– Read the data from the disks
– then data is written from NVRAM when the system is brought back online or by the partner machine in an active-active environment
.
9
Read Requests
✓ Data ONTAP ✓ Writes ➢ Reads
Network SAN Host
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
.
8
NVRAM
Data ONTAP writes from system memory
– Note: NVRAM is never used for normal write operations
– NVRAM is backed up with a battery
If system failure occurs before the completion of the consistency point:
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOGStorage
.
6
Data Flow: Write Request – RAID to Storage
Network SAN Host
UNIX Client
Network Stack
Physical Memory
NVRAM
Disks
.
3
Write Requests
✓ Data ONTAP ➢ Writes • Reads
Write requests come into Data ONTAP through a variety of different interface protocols
– CIFS
– NFS
– FCP
– iSCSI
– HTTP
– WebDAV
Write requests are buffered into
– System memory
– NVRAM
.
4
Data Flow: Write Request – Write Buffer
Network
SAN Host
ACK ACK
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 file system on a volume
WAFL
RAID
Storage
.
5
Data Flow: Write Request – WAFL to RAID
Network
SAN Host
UNIX Client
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
– Describe the WAFL file system, including consistency points, RAID management, and storage levels
– Describe how RAID is used to protect disk data – Describe how the WAFL file system processes
Protocols
RS-232
SAN Service
HBA
NFS Service
CIFS Service
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
WAFL
RAID
4K
Storage
.
7
Data Flow: Write Request – Storage Writes
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
V
NVLOG
R
NVLOG
A
NVLOG
M
NVRAM Full
write and read requests
.
2
Data ONTAP Simplified
➢ Data ONTAP • Writes • Reads
Network
Client Client
Data ONTAP
Network Protocols WAFL RAID Storage
Client
Client Client
– Data that recently was written to disk – Data that recently was read from disk
.
10
Data Flow: Read Request –Cache
Network
SAN Host
Network Stack
Protocols
RS-232
SAN Service
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
UNIX Client
HBA NIC
NFS Service
CIFS Service
Every time a read request is received, WAFL determines whether to either:
– Read the data from the system memory (aka cache)
– Read the data from the disks
– then data is written from NVRAM when the system is brought back online or by the partner machine in an active-active environment
.
9
Read Requests
✓ Data ONTAP ✓ Writes ➢ Reads
Network SAN Host
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
.
8
NVRAM
Data ONTAP writes from system memory
– Note: NVRAM is never used for normal write operations
– NVRAM is backed up with a battery
If system failure occurs before the completion of the consistency point:
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOGStorage
.
6
Data Flow: Write Request – RAID to Storage
Network SAN Host
UNIX Client
Network Stack
Physical Memory
NVRAM
Disks
.
3
Write Requests
✓ Data ONTAP ➢ Writes • Reads
Write requests come into Data ONTAP through a variety of different interface protocols
– CIFS
– NFS
– FCP
– iSCSI
– HTTP
– WebDAV
Write requests are buffered into
– System memory
– NVRAM
.
4
Data Flow: Write Request – Write Buffer
Network
SAN Host
ACK ACK
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 file system on a volume
WAFL
RAID
Storage
.
5
Data Flow: Write Request – WAFL to RAID
Network
SAN Host
UNIX Client
Network Stack
Protocols
RS-232
SAN Service
HBA NIC
NFS Service
CIFS Service
– Describe the WAFL file system, including consistency points, RAID management, and storage levels
– Describe how RAID is used to protect disk data – Describe how the WAFL file system processes
Protocols
RS-232
SAN Service
HBA
NFS Service
CIFS Service
Windows Client
Memory Buffer
NVLOG
N
NVLOG
V
NVLOG
R
NVLOG
A
NVLOG
M
WAFL
RAID
4K
Storage
.
7
Data Flow: Write Request – Storage Writes
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
V
NVLOG
R
NVLOG
A
NVLOG
M
NVRAM Full
write and read requests
.
2
Data ONTAP Simplified
➢ Data ONTAP • Writes • Reads
Network
Client Client
Data ONTAP
Network Protocols WAFL RAID Storage
Client
Client Client