Raid 1 - Accusys ACS-76500 Owner's 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. RAID 1 can only be performed with two hard drives (with
four drives, RAID 0+1 is configured automatically). As data is identical on both disks, storage
capacity is that of the smaller disk. RAID 1 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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Accusys 76500/76510
Recommended use:

Accounting

Payroll

Financial

Any application
requiring high
availability