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WriteandReadRequestProcessing DataONTAPFundamentals 2 NetApp 2008 NetApp Allrightsreserved Objectives Attheendofthismodule youwillbeableto DescribethewritingandreadingofdatatoandfromaWAFLfilesystemonavolumeDescribetheWAFLfilesystem includingconsistencypoints RAIDmanagement andstoragelevelsDescribehowRAIDisusedtoprotectdiskdataDescribehowtheWAFLfilesystemprocesseswriteandreadrequests 3 NetApp 2008 NetApp Allrightsreserved DataONTAPSimplified DataONTAPWritesReads 4 NetApp 2008 NetApp Allrightsreserved WriteRequests WriterequestscomeintoDataONTAPthroughavarietyofdifferentinterfaceprotocolsCIFSNFSFCPiSCSIHTTPWebDAVWriterequestsarebufferedintoSystemmemoryNVRAM DataONTAPWritesReads 5 NetApp 2008 NetApp Allrightsreserved DataFlow WriteRequest WriteBuffer WindowsClient RS 232 NVRAM NVLOG HBA SANHost WAFL RAID NIC Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer ACK NVRAMFull NVLOG NVLOG NVLOG NVLOG ACK ACK ACK ACK UNIXClient 6 NetApp 2008 NetApp Allrightsreserved UNIXClient WindowsClient RS 232 HBA SANHost WAFL RAID DataFlow WriteRequest WAFLtoRAID NIC Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer NVRAM NVLOG NVLOG NVLOG NVLOG NVLOG 7 NetApp 2008 NetApp Allrightsreserved UNIXClient WindowsClient RS 232 HBA SANHost WAFL RAID DataFlow WriteRequest RAIDtoStorage 4K Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer NVRAM NVLOG NVLOG NVLOG NVLOG NVLOG 8 NetApp 2008 NetApp Allrightsreserved UNIXClient WindowsClient RS 232 HBA SANHost WAFL RAID DataFlow WriteRequest StorageWrites NIC Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer NVRAM NVLOG NVLOG NVLOG NVLOG NVLOG 9 NetApp 2008 NetApp Allrightsreserved NVRAM DataONTAPwritesfromsystemmemoryNote NVRAMisneverusedfornormalwriteoperationsNVRAMisbackedupwithabatteryIfsystemfailureoccursbeforethecompletionoftheconsistencypoint thendataiswrittenfromNVRAMwhenthesystemisbroughtbackonlineorbythepartnermachineinanactive activeenvironment 10 NetApp 2008 NetApp Allrightsreserved ReadRequests Everytimeareadrequestisreceived WAFLdetermineswhethertoeither Readthedatafromthesystemmemory akacache ReadthedatafromthedisksThecacheispopulatedby DatathatrecentlywaswrittentodiskDatathatrecentlywasreadfromdisk DataONTAPWritesReads 11 NetApp 2008 NetApp Allrightsreserved DataFlow ReadRequest Cache WindowsClient RS 232 HBA SANHost WAFL RAID NIC Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer UNIXClient Cache NVRAM NVLOG NVLOG NVLOG NVLOG NVLOG 12 NetApp 2008 NetApp Allrightsreserved DataFlow ReadRequest ReadfromDisk WindowsClient RS 232 HBA SANHost WAFL RAID NIC Storage NFSService SANService CIFSService Protocols Network NetworkStack MemoryBuffer UNIXClient NVRAM NVLOG NVLOG NVLOG NVLOG NVLOG Cache 13 NetAp

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