94 Confi gur ing PERC 3w w w . d e l l . c o m | s u p p o r t . d e l l . c o m Maximizing CapacityRAID 0 achieves maximum drive capacity, but does not provide dataredundancy. Maximum drive capacity for each RAID level is shown below.original equipment manufacturer (OEM) level firmware that can span up tofour logical drives is assumed. Table 7-7 displays the drives required, andcapacity for the various RAID levels.Maximizing Drive AvailabilityYou can maximize the availability of data on the physical disk drive in thelogical array by maximizing the level of fault tolerance. The levels of faulttolerance provided by the RAID levels are shown in Table 7-8.Ta b l e 7 - 7 . D r i v e s a n d C a p a c i t i e s f o r E a c h R A I D L e v e lRAIDLevelDescription DrivesRequiredCapacity0 Striping withoutparity1 – 32 (Number of disks) X (capacity ofsmallest disk)1 Mirroring 2 (Capacity of smallest disk) X (1)5 Striping withfloating paritydrive3 – 32 (Number of disks) X (capacity ofsmallest disk) - (capacity of 1disk)10 RAID 1 andstriping4 – 16(Must be amultiple of2)(Number of disks) X (capacity ofsmallest disk) / (2)50 RAID 5 andstriping6 – 256(Must be amultiple ofarrays)(Number of disks) X (capacity ofsmallest disk) – (capacity of 1disk X number of arrays)Ta b l e 7 - 8 . Fa u l t To l e r a n c e Fe a t u r e s f o r R A I D L e v e l s 0 , 1a n d 5RAIDLevelFault Tolerance Protection0 No fault tolerance1 Disk mirroring, which provides 100% data redundancy.
