Raid 1 - Accusys ACS-9910 User Manual

RAID 1

RAID 1 is commonly referred to as Disk Mirroring, Disk Shadowing or Disk Duplexing as all
data is duplicated across both disks. As data is identical on both disks, storage capacity is that
of the smaller disk. RAID1 has poor performance for write operations but very high
performance for read intensive operations.
RAID 1: Mirroring
Characteristics:
Better Read transaction rate then single disks,
same Write transaction rate as single disks.
100% redundancy of data means no rebuild of
data is necessary in case of disk failure, just a
copy to the replacement disk.
All the disks have the same data.
Raid level 1 requires two drives.
Storage capacity = Capacity of smaller disk
Arrangement of data blocks saved on a Level 1 array
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ACS-9910 User's Manual
Recommended use:
Accounting
Payroll
Financial
Any application
requiring high
availability