Introduction
10
3ware Escalade ATA RAID Controller User Guide
array using RAID 1. The two mirrored arrays are then grouped as a striped
RAID 0 array using a two tier structure. Higher data transfer rates are
achieved by leveraging
TwinStor and striping (64K, 128K, 256K, 512K or 1M) the arrays. RAID 10
is available on the four, eight, and twelve port Escalade ATA RAID
Controllers
Figure 3. RAID 10 Configuration Example
RAID 5 arrays optimize performance, fault tolerance,
high capacity and storage efficiency
The RAID 5 configuration features the data striping of RAID 0 combined
with the parity of RAID 4. Using a simple parity (exclusive OR) function,
RAID 5 can tolerate the loss of one drive. Parity information is distributed
across all drives rather than being concentrated on a single disk (see Figure 4).
This avoids throughput loss due to contention for the parity drive. You can use
hot spares to rebuild a failed drive “on-the-fly”.
RAID 5 capacity = size of smallest drive
×
(number of drives - 1). In addition,
the array’s storage efficiency increases with the number of disks; from 66.7%
for 3 drives to 87.5% for 8 drives: storage efficiency = (number of drives -1)
÷
(number of drives).
Unlike all other RAID configurations that offer data striping, except for RAID
1, RAID 5 stripe size is limited to 64k.
Note:
BIOS will reject the creation of a RAID 5 array having less
than 3 drives.
Summary of Contents for 3W-7410 - Escalade 7410 RAID Controller
Page 6: ...iv 3ware Escalade ATA RAID Controller User Guide ...
Page 14: ...Before You Begin 6 3ware Escalade ATA RAID Controller User Guide ...
Page 24: ...Quick Installation Guide 16 3ware Escalade ATA RAID Controller User Guide ...
Page 68: ...Windows Installation 60 3ware Escalade ATA RAID Controller User Guide ...
Page 86: ...FreeBSD Installation 78 3ware Escalade ATA RAID Controller User Guide ...
Page 104: ...3DM Disk Management Utility 96 3ware Escalade ATA RAID Controller User Guide ...
Page 116: ...Troubleshooting Problems and Solutions 108 3ware Escalade ATA RAID Controller User Guide ...
Page 126: ...Index 118 3ware Escalade ATA RAID Controller User Guide ...