raid redundant array of independent disks redundant array of inexpensive disks

RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks Von Holger Brock & Sebastian Möller

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RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks. Von Holger Brock & Sebastian Möller. Inhalt. Was ist ein RAID Die Geschichte des RAID Die einzelnen RAID – Level Terminologie im RAID LBAR (Let‘ s build a RAID) Fazit. Was ist ein RAID. - PowerPoint PPT Presentation

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RAIDRedundant Array of Independent DisksRedundant Array of Inexpensive Disks

VonHolger Brock&Sebastian Möller

Inhalt

Was ist ein RAID Die Geschichte des RAID Die einzelnen RAID – Level Terminologie im RAID LBAR (Let‘ s build a RAID) Fazit

Page 3: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Was ist ein RAID

Redundant Array of Independent Disks Verbund mehrerer Datenspeicher Steigerung von Sicherheit und

Performance

Page 4: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Die Geschichte des RAID

Entwicklung von Dr. David Patterson, Dr. Garth Gibson und Dr. Randy Katz

1988 offiziell vorgestellt Ursprünglich zur Kostensenkung Redundant Array of Inexpensive Disks

Page 5: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Die einzelnen RAID- Level

RAID Level 0 RAID Level 1 RAID Level 2 RAID Level 3 RAID Level 4 RAID Level 5 RAID Level 6 & 7

Page 6: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 0

Gleichmässige Verteilung der Daten

Beschleunigung von Plattenzugriffen

Nicht redundant

Page 7: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 1

Mindestens 2 Platten Redundant Lesezugriffe

beschleunigt Höhere Kosten

Page 8: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 2

ECC Code Schütz auch vor

Daten Inkonsistenz Mindestens 10

Platten Nicht

Praxisrelevant

Page 9: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 3

Byteweise striping Dediziertes Parity

Laufwerk Schnell bei

zusammenhängenden Dateien

Synchrone Kopfstellung

Page 10: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 4

Blockweise striping Schnell beim lesen

kleiner Dateien Dediziertes Parity

Laufwerk Asynchrone

Kopfstellung

Page 11: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 5

Verteilte Parity Informationen

Schnell bei Schreib- und Lesezugriffen

Stark verbreitet

Page 12: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

RAID Level 6 & 7

RAID 6 = RAID 5 + Parity Laufwerk• Langsam beim schreiben• Sicher gegen Ausfall von 2 Platten

RAID 7 = RAID 5 + große Caches• Schnell durch Abkopplung der Laufwerke vom Bus• Mehrere Parity Laufwerk möglich

(ähnlich RAID 6)

Page 13: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Level Kombinationen

Kombinationen der RAID Level möglich Vorteile der verschiedenen RAID Level

werden ergänzt Beispiele: RAID 10, 53...

Page 14: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Terminologie im RAID

Parity = Korrekturinformationen (Checksummen)

Hot Spare = Laufwerk welches bei Ausfall eines anderen Laufwerks einspringt

How Swap = Austausch von Platten im Betrieb

Page 15: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Let‘ s build a RAID

Windows Software RAID

Page 16: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Let‘ s build a RAID

Mac OS X Software RAID

Page 17: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Let‘s build a RAID

Hardware RAID

Meist SCSI oder FibreCannel

Prädestiniert für höhere RAID Level

Einfacheres Handling

Page 18: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

Fazit...

Keine Sicherheit gegen den größten Störfaktor (User)

Ersetzt keinesfalls ein Backup RAID Level muss je nach Einsatzgebiet

gewählt werden

Page 19: RAID Redundant Array of Independent Disks Redundant Array of Inexpensive Disks

AUFWACHEN!!!

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