HP Surestore Disk Array 12h - And FC60 Advanced User's Manual page 51
Hp surestore e disk array fc60 - (english) advanced user's guide
Hide thumbs
Also See for Surestore Disk Array 12h - And FC60:
- Service manual (746 pages) ,
- User manual (310 pages) ,
- System administrator manual (279 pages)
Table of Contents
Advertisement
fails. RAID-0 provides enhanced performance through simultaneous I/Os to multiple disk
modules. Software mirroring the RAID-0 group provides high availability.
Figure 18
illustrates the distribution of user and parity data in a four-disk RAID 0 LUN. The
the stripe segment size is 8 blocks, and the stripe size is 32 blocks (8 blocks times 4 disks).
The disk block addresses in the stripe proceed sequentially from the first disk to the
second, third, and fourth, then back to the first, and so on.
Figure 18
LUN
RAID 0
RAID 1
RAID 1 uses mirroring to achieve data redundancy. RAID 1 provides high availability and
good performance, but at the cost of storage efficiency. Because all data is mirrored, a
RAID 1 LUN has a storage efficiency of 50%.
A RAID 1 LUN consists of exactly two disks configured as a mirrored pair. One disk is the
data disk and the other is the disk mirror. The disks in a RAID 1 LUN are mirrored by the
disk array hardware, which automatically writes data to both the data disk and the disk
mirror. Once bound into a RAID 1 mirrored pair, the two disks cannot be accessed as
Disk Array High Availability Features
51
Advertisement
Table of Contents
Troubleshooting
