Adaptec RAID 6405 Betriebsanweisung Seite 155

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Appendix B: Selecting the Best RAID Level 155
Non-redundant Logical Drives (RAID 0)
A logical drive with RAID 0 includes two or more disk drives and provides data striping, where
data is distributed evenly across the disk drives in equal-sized sections. However, RAID 0
arrays do not maintain redundant data, so they offer no data protection.
Compared to an equal-sized group of independent disks, a RAID 0 array provides improved I/O
perfor
mance.
Drive segment size is limited to the size of the smallest disk drive in the logical drive. For
instance, a logical drive with two 250 GB disk drives and two 400 GB disk drives can create a
RAID 0 drive segment of 250 GB, for a total of 1000 GB for the volume, as shown in this figure.
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
250 GB
250 GB
400 GB
400 GB
Drive Segment Size (Smallest Disk Drive)
Disk Drive 2
Disk Drive 3
Disk Drive 4
Disk Drive 1
15...997
26...998
3 7 ... 999
4 8 ... 1000
Unused Space = 150 GB
Disk Drives in Logical Drive RAID 0 Logical Drive = 1000 GB
Unused Space = 150 GB
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