Accusys ACS-76510 - Manual (Page 14)

Accusys 76500/76510
14
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:
Recommended use:
 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
 Accounting
 Payroll
 Financial
 Any application
requiring high
availability
Arrangement of data blocks saved on a Level 1 array