Standard RAID 5,
RAID 1, RAID 0 Explained
Parity Block Order.
All Raid systems
Hardware or Software work the same way. Data block size and block order are
setup when the Raid Array is first initialized.
size can be anything the Raid Controller has available
- 32K= 64 sectors per
- 64K= 128 sector
- 128K=256 sector etc..
Left Synchronous (Standard) Raid
Left Asynchronous Raid
Right Synchronous Raid
Right Asynchronous Raid
Raid Calculation for missing hard
drive with Raid 5 parity.
CRC1 = A
xor B xor C
CRC2 = D xor E xor F
CRC3 = G xor H xor I
CRC4 = J xor K xor L
missing Drive C
= A xor B xor CRC1
H = G xor CRC3 xor I
K = CRC4 xor J xor L
Single drive failure is completely
recoverable. If a second hard drive fails, the raid will crash and you will
need to recover one of the two failed hard drives to recover your data. Call
us immediately if your Raid is not accessible (866) 432-8291
Disk A & Disk B are mirrored
to Disk B & Disk C. Single hard drive failure is completely recoverable.
If Disk B & Disk C or Disk A & Disk D fail, you can still recover the
data. Any other hard drive failure will require the recovery of at least one
of the two failed hard drives. Call us immediately if your Raid is not accessible
Loss of one drive in a Raid 0 configuration
is catastrophic and not recoverable unless the failed hard drive can be recovered.
Call us immediately if your Raid is not accessible (866) 432-8291