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Bustamante0j'&&N BArchival Storage~Abundant storage - storing data for long time, even forever Archival system  write-once policy  changes how we see storage Prevalent form of archival storage - tape backup Central service for a number of clients Restoring data tedious and error prone (requires sys admin or privileged software) Infrequent, so problems may go undetected for long Tradeoff bet/ performance of backup & restore (incremental backups are more efficient to generate, but not self-contained) Snapshots (Plan 8, Andrew FS, & ) A consistent read-only view of FS at some point in past Maintains file system permissions Can be accessed with standard tools  ls, cat, cp, grep, diff Avoids tradeoff between full vs. incremental backup Looks like full backup Implementation resembles incremental backup  share blocks Only a small number of versions are keptvP)P!PP{P)!  {,y CVenti\GOAL:  To provide a write-once archival repository that can be shared by multiple client machines and applications Block level network storage system Actually a backend storage for client apps Block level i/f places few restrictions on data structures/format Blocks addressed by hash of their contents Uses SHA-1 algorithm SHA-1 output is 160 bit (20 byte) fingerprint of data block Write once policy Once written cannot be deleted Multiple writes of same data coalesced Data sharing  increases effective storage capacity Makes write operation idempotent PmP+PQPP P'PUPPm+7          'U  ^DVentiDMultiple clients can share a Venti server Hash fn gives an universal namespace Inherent integrity checking of data Fingerprint computation on retrieval Caching is simplified Uses magnetic disks as storage technology Access time comparable to non-archival data Hashing function  sha1 is more than enough for now Exabyte of storage (1018 bytes) in 8 Kbytes blocks (~1014 blocks - n) with sha1 (b = 160 bits)  p < 10-20J*Z%Z$Z%Z@Z,ZZ*%$%  @,J      8dEApplications - general  Venti as a building block to construct storage apps Data divided into blocks App needs fingerprint for retrieval One approach - fingerprints packed into pointer blocks, also written to server Repeated recursively to get single fingerprint - root of tree ZFApplications - general  Tree cannot be modified, but Unchanged sections of tree reused More complex data structures Mixing data & fingerprints in a block e.g. structure for storing file system 3 types of blocks Directory  file metadata + root fingerprint Pointer Data l]Z&Z'ZZ<Z]&' <HExample app: VacBSimilar to zip & tar  store collection of files & directories as single object Tree of blocks formed for selected files vac archive file - 45 bytes long 20 bytes for root fingerprint 25 bytes fixed header string any amount of data compressed down to 45 bytes Unvac  to restore file from archive Duplicate copies of file coalesced on server Multiple users vac same data  only 1 copy stored vac on changed contents ^ZjZRZLZjRL  Py\ I"Example app: Physical level backupCopy the raw disk blocks to Venti No need to walk file hierarchy Higher throughput Duplicate blocks are coalesced Free block  null in pointer tree User sees full backup of device Storage space advs of incremental backup retained Random access possible Directly mounting a backup file system image (w/ OS support) Enables lazy (on demand) restore^"Z1ZZ^Z"1^  JExample app - Plan 9 FSGPreviously Magnetic disk + write-once optical jukebox Cache for faster access & accumulated changes bet/ snapshots Cache smaller than active file system Cache misses are painful Plan 9 FS on top of Venti Venti as storage device (instead of jukebox) Equalizes access to both active & archival storage Cache can also be smaller j { {  wKImplementation  |Append-only log of data blocks RAID array Separate index maps fingerprints to log location Can be regenerated from data log jP P1P"P "  L Venti s data log  MVenti s indexNo. of fingerprints >> no. of blocks on a server Index as disk-resident hash table Hashing function maps fingerprints to index buckets Going through index is main performance penalty Caching (block and index) Index striped across multiple disks  fingerprint location in index is random & index is too big to fit in memory Write buffering (to increase number of concurrent accesses) Block cache - hit - index lookup & data log bypassed Index cache - hit - index lookup bypassed l__  N#Performance: computing environments$$ Testbed Dedicated dual 550Mhz Pentium 3, 2GB mem. Access through a 100Mbps Ethernet Data log stored on a 500GB MaxTronic IDE Raid 5 Index stored on 8 Seagate Cheetah 18XL 9GB SCSI Micro-benchmark results F6&? V UBStorage usage  file servers used2 plan 9 file servers, bootes and emelie Spanning 1990 to 2001 522 user accounts, 50-100 active at a time Numerous development projects hosted Several large data sets Astronomical data, satellite imagery, multimedia files Next figures Size of active file system Space consumed on jukebox Space when using Venti Ratio  using Venti reduces the cost of retaining snapshots (so ratio is smaller))h7 )h7   P ? T Storage usagePStorage savingWhen stored on Venti, size of jukebox data reduced by 3 factors Elimination of duplicate blocks Elimination of block fragmentation Compression of block contents :@a@aQReliability & recoveryTools for integrity checking & error recovery Verifying structure of arena Checking there is an index entry for every block in data log, vice versa Rebuilding index from data log Copying arena to removable media Data log on RAID 5 disk array Protection against single drive failures Off-site mirrors for extra protection, if that s not enough & Stored sealed arenas into removable media l.)i.)  iR Future WorkLoad balancing Distribute Venti across multiple machines Replicate server Use of proxy server to hide it from client Better access control Currently just authentication to server Single root fingerprint gives access to entire file tree Use of variable sized blocks as in LBFSbfa(fa ( S ConclusionAddressing block by SHA-1 hash of contents  good fit for archival storage Magnetic disks as storage technology Large capacity at low price  online storage Random access Performance comparable to non-archival data Write once model Reduces accidental or malicious data loss Simplifies administration Simplifies caching Allows sharing of data Zpgnpgo (   0` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!` T3f3f___>?" dd@$?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `(p>>  H@ (    s *\ "0@  T Click to edit Master title style! !  c $H "0j  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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B d # lD8c?  B d # lD8c?B d # lD8c? H B d # lD8c? { B d # lD8c? B d # lD8c? r   d  fy 1?"`aN  ^ Venti Server (2   !d # l1?"`hr  $d  fxy 1?"` ?Network(2  %d  fLy 1?"`H >Client(2  &d  fy 1?"` c  >Client(2  'd  f"y 1?"`d6" >Client(2 H d 0޽h ? 3333̙3___PPT10i.l qR+D=' = @B +  0    h, (  h~ h s *Dy 0@  y   h 00y A   y   K h@ S ~ܘy GsHc1? " ;,$D 0 ['Log divided into arenas for maintenance(( V h@ S ~y GJSH1? " F ,$D 0 f2Append only section of data blocks (variable size)33 J h@ S ~y G1SHt1? " Wx,$D 0 Z&For integrity checking & data recovery''  h@ S ~y G\H1? "  ,$D 0 Data compressed (LZ77)  encoding  if, algo. esize size after compression"4N ,*I h@ S ~y GPH1? 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T3f3f___80___PPT10.Q}  0  4x/(  x~ x s *y 0@  y  ~ x s *y 0j y  t    4x #"&\\\\\   "x # ly 1?\   M76.5% @`  x # ls 1? \  M59.7% @` x # l s 1?  WTotal reduction @` x # ls 1?\   M54.1% @` x # ls 1?  \  M33.8% @` x # l (s 1?  XData compression @` x # l1s 1?\F   M25.4% @`  x # l9s 1? F \  M10.2% @`  x # lDfpĵ3.8>u .B,/nҁ3)2Vz' ·ڡGq2y/+UQaFL_CFX^k*X?η 3)f͇Pw˜"?#(rw.?『e ާGS>wRuw4|زF8D >-!{?[uggS 3ɟv"}Éظ2&eji~Z ǻ' 3#2Z͖> vk7gP=b74V]zr"vb0y;XGOdJ~>YJKUF_O 2E9wj-DXܐj-NUdDž֯ʺꝁ2-a1q775qhLC}v*F;s ecG݂Hԭ=Z:J2J>`8'n-x9Ϳ[/׿-f8~>"N9+}Bqvz7:S|4X owՊƘ̸>sQd,@ۊ|3l5@ꐍ~VTNاs a=:XGs$7?ln/v/={!? 7n#o_;nr|&c( ENuZjiPloqr=p*}p7d?j 1Oh+'0Ux   , 8 D P\dWelcomeDistributed SystemsFabian E. Bustamante AquaLab05Fabian E. 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