User Manual - A3661-90001

RAID General Information 1-25
Product Description
Parity
3DULW\LVDGDWDSURWHFWLRQIHDWXUHWKDWDOVRPDNHVGDWDKLJKO\DYDLODEOH3DULW\GDWDPDNHVLW
SRVVLEOHIRUD5$,'JURXSWRVXUYLYHDQXPEHURIIDLOXUHVZLWKRXWORVLQJXVHUGDWD
 ,IRQHGDWDGLVNPRGXOHIDLOVWKH63FDQUHFRQVWUXFWWKHXVHUGDWDIURPWKHUHPDLQLQJXVHUGDWD
DQGSDULW\LQIRUPDWLRQ
 ,IWKHSDULW\GLVNIDLOVWKHSDULW\LQIRUPDWLRQFDQEHUHFDOFXODWHGIURPWKHGDWDGLVNV
 ,IHDFKGLVNPRGXOHLQD5$,'JURXSLVERXQGRQDVHSDUDWHLQWHUQDO6(6&6,EXVDQGRQHEXV
IDLOVWKHGLVNPRGXOHRQLWLVLQDFFHVVLEOH$IWHUWKHEXVIDXOWLVFOHDUHGWKH63FDQUHEXLOGWKH
5$,'JURXSIURPWKHXVHUDQGSDULW\LQIRUPDWLRQVWRUHGRQWKHGLVNPRGXOHVRQWKHRWKHU
6&6,EXVHV
,QDOOWKUHHFDVHVWKHUHEXLOW5$,'JURXSFRQWDLQVDUHSOLFDRIWKHLQIRUPDWLRQLWZRXOGKDYH
FRQWDLQHGKDGWKHGLVNPRGXOHRU6&6,EXVQRWIDLOHG
3DULW\LVFDOFXODWHGRQHDFKZULWH,2E\GRLQJDVHULDOELQDU\H[FOXVLYH25RIWKHGDWDVHJPHQWVLQ
WKHVWULSHZULWWHQWRWKHGDWDGLVNVLQWKH5$,'JURXS)RUH[DPSOHLQD5$,'JURXSRIILYHGLVN
PRGXOHVWKHGDWDVHJPHQWZULWWHQRQWKHILUVWGLVNLVH[FOXVLYH§25HG¨ZLWKWKHGDWDVHJPHQW
ZULWWHQRQWKHVHFRQGGLVN7KHUHVXOWLVH[FOXVLYH§25HG¨ZLWKWKHZULWHVHJPHQWRQWKHWKLUGGLVN
ZKLFKLVH[FOXVLYH§25HG¨ZLWKWKHZULWHVHJPHQWRQWKHIRXUWKGLVN7KHUHVXOWZKLFKLVWKHSDULW\
RIWKHZULWHVHJPHQWLVZULWWHQWRWKHILIWKGLVNRIWKH5$,'JURXS
5$,'DQG5$,'JURXSVPDLQWDLQSDULW\GDWDWKDWOHWVDGLVNJURXSVXUYLYHRQHGLVNPRGXOH
IDLOXUHZLWKRXWORVLQJGDWD7KHJURXSFDQDOVRVXUYLYHDVLQJOHLQWHUQDO6(6&6,EXVIDLOXUHLIHDFK
GLVNPRGXOHLQWKH5$,'JURXSLVERXQGRQDVHSDUDWHLQWHUQDO6(6&6,EXV$IWHUWKHIDLOHGGLVN
PRGXOHLVUHSODFHGRUWKHEXVIDXOWLVFOHDUHGWKH63UHEXLOGVWKHGLVNJURXSIURPWKHLQIRUPDWLRQ
VWRUHGRQWKHUHPDLQLQJGLVNPRGXOHV7KHUHEXLOW5$,'JURXSFRQWDLQVDUHSOLFDRIWKHLQIRUPDWLRQ
LWZRXOGKDYHFRQWDLQHGKDGWKHGLVNPRGXOHRUWKH6&6,EXVQRWIDLOHG
RAID-1 (Mirrored Pair)
$5$,'JURXSFRQVLVWVRIH[DFWO\WZRGLVNPRGXOHVERXQGWRJHWKHUDVDPLUURUHGSDLU2QHGLVNLV
WKHGDWDGLVNDQGWKHRWKHULVWKHGLVNPLUURU7KHGLVNVLQD5$,'SDLUDUHPLUURUHGE\WKHGLVN
DUUD\KDUGZDUHZKLFKDXWRPDWLFDOO\DQGWUDQVSDUHQWO\ZULWHVWKHGDWDWRERWKWKHGDWDGLVNDQGWKH