Disk Array FC60 User's Guide (A5277A)

1240DQDJLQJ'LVN$UUD\&DSDFLW\
6HOHFWLQJ'LVNVIRUD/81
:KHQELQGLQJD/81\RXPXVWVHOHFWWKHGLVNVWKDWZLOOEHXVHG7KHFDSDFLW\RIWKH/81
LVGHWHUPLQHGE\WKHQXPEHUDQGFDSDFLW\RIWKHGLVNV\RXVHOHFWDQGWKH5$,'OHYHO
:KHQVHOHFWLQJGLVNVIRUD/81FRQVLGHUWKHIROORZLQJ
 7RPD[LPL]HKLJKDYDLODELOLW\VHOHFWGLVNVLQGLIIHUHQWGLVNHQFORVXUHVRURQGLIIHUHQW
FKDQQHOV0XOWLSOHGLVNVLQWKHVDPHHQFORVXUHPDNHD5$,'/81YXOQHUDEOHWRDQ
HQFORVXUHIDLOXUH$5$,'RU/81FDQVXUYLYHDQHQFORVXUHIDLOXUHDVORQJDVERWK
GLVNVRIDPLUURUHGSDLUDUHQRWLQWKHVDPHHQFORVXUH,I\RXDWWHPSWWRVHOHFWGLVNVLQ
WKHVDPHHQFORVXUHRURQWKHVDPHFKDQQHOZKHQELQGLQJD/81\RXZLOOEHZDUQHG
WKDWGRLQJVRPD\FRPSURPLVHKLJKDYDLODELOLW\
 6HOHFWGLVNVRIWKHVDPHFDSDFLW\%LQGLQJD/81XVLQJGLIIHUHQWVL]HGLVNVZLOOUHVXOWLQ
XQXVHGFDSDFLW\RQWKHODUJHUGLVNV)RUH[DPSOHELQGLQJDGLVN/81WKDWLQFOXGHV
WZR*E\WHGLVNVDQGWZR*E\WHGLVNVZLOOUHVXOWLQD/81ZLWKWKHFDSDFLW\RIIRXU
*E\WHGLVNV2QO\*E\WHVRIWKHODUJHUGLVNVZLOOEHXVHGZKHQFUHDWLQJWKH/81
 &RQVLGHUXVLQJPRUHGLVNVIRU5$,'/81V7KLVLQFUHDVHVERWKSHUIRUPDQFHDQG
VWRUDJHHIILFLHQF\%HFDXVH5$,'XVHVRQO\RQHGLVNªVZRUWKRIFDSDFLW\IRUSDULW\
PRUHGLVNVLQWKH/81ZLOOUHVXOWLQDJUHDWHUSHUFHQWDJHRIWKHGLVNFDSDFLW\XVHGIRU
GDWD)RUH[DPSOHLQDGLVN5$,'/81RIWKHFDSDFLW\LVXVHGIRUGDWDRI
$GGLQJDQRWKHUGLVNWRWKH/81ZLOOLQFUHDVHWKHSHUFHQWDJHRIGLVNFDSDFLW\XVHGIRU
GDWDWRRI
6HOHFWLQJ'LVNVIRUD5$,'/81
7KHRUGHULQZKLFK\RXVHOHFWGLVNVLVLPSRUWDQWZKHQFUHDWLQJD5$,'/817KHILUVW
KDOIRIWKHGLVNV\RXVHOHFWZLOOEHWKHSULPDU\GLVNVDQGWKHVHFRQGKDOIRIWKHGLVNVZLOO
EHWKHGLVNPLUURUV7RPDLQWDLQGDWDDYDLODELOLW\WKHGLVNPLUURUVPXVWEHLQDGLIIHUHQW
HQFORVXUHWKDQWKHSULPDU\GLVNV7KLVDSSOLHVUHJDUGOHVVRIZKLFKWRRO\RXDUHXVLQJWR
ELQGD5$,'/81
)RUH[DPSOHLQ)LJXUHDGLVN5$,'/81LVEHLQJERXQGXVLQJRQHGLVNHQFORVXUH
RQFKDQQHODQGDVHFRQGGLVNHQFORVXUHRQFKDQQHO7KHFRUUHFWRUGHUIRUVHOHFWLQJ
GLVNVLV7KLVVHOHFWLRQRUGHUFUHDWHVPLUURUHGSDLUVRIDQG
7KLVPDLQWDLQVKLJKDYDLODELOLW\EHFDXVHWKHSULPDU\GLVNVDUHRQFKDQQHODQGWKHPLUURU
GLVNVDUHRQFKDQQHO