Manual Fantec QB-35U31R (page 16 of 22) (English)

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EN 16

RAID 0

• WhenaharddrivefailsinaRAID0,theRAIDfailscompletely.

• A RAID 0 Spanningoffersthepossibilitytouseharddriveswithdifferentcharac-

teristics.Thisisonlyagoodsolutionifthesaveddataisactuallyredundant.As

anarchiveof“oldharddrives”itisnotagoodsolution.Olddiskswilleventually

failandyourarchivewillbelost.

RAID 1

• ARAID1continuestoworkevenifoneharddrivefails.Thefaileddiskshouldbe

replacedassoonaspossibleasanotherdiskfailurewouldmeanacompleteloss

of all data. We recommend to perform a data backup before installing the new

hard drive. The exchange of a hard drive and the following rebuild of the data

usebothdrivesheavily–thereisariskfortheotherharddrivetofailtoo.

• The installation of a new hard drive triggers the rebuild of the data. You can

simplyputinthenewharddriveswhiletheotherarebusybutthesmooth

operationofaRAID1canbeinterruptedbythat.Therebuildingprocesstakes

several hours – it is dependent on size and processing speed of the hard drives.

It  which means it cannot be seen on

theharddrives.Althoughthedrivecanbeusedduringtherebuildthiswilldelay

the process.

• The rebuild willnotstartwhendriveisactivelyaccessedorthedatacableisnot

connected.Ifyounoticethis,justturnoffthedevice,connectittoaPCandturn

it on again.

• A started and active rebuild will be carried out even with disconnected USB

cable.

• A disk failureissignalledbytheashingoftheredLED(Nr.12)onthefailed

disk.

• A rebuildofthemirrorissignalledbythelightoftheredLED(Nr.12)onthe

faileddisk.AtthesametimebothLEDs(Nr.11)arechangingcolourbetween

blueanpurpleandbothharddrivesareworkingpermanently.

• Hard drives age and will eventually fail.Theycanalsofail spontaneously due

to other defects.Whentheyare“identical”theywillreachtheirlifetime limit

around the same time.

Accordingtothiswerecommendfollowingstrategyforexchangingharddrives:

Hasoneharddrivefailedspontaneously,exchangethisoneharddrive.Hasthe

hard drive reached its lifetime limit (which differs from hard drive model to

modelanddependsontheintensityofusage),betterexchangebothharddrives

–aftercreatingabackup.ThisallowsforaRAID1systemwhichworksreliably

for a long time.

Hints for the Installation of Hard Drives with Data

Important: If you plan to remove hard drives from one system to install them into

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Fantec QB-35U31R Manual

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