ACRONIS Backup & Recovery 10 Advanced Server User's Guide download pdf (Page 292)

A volume created from free disk space virtually linked together by the LDM from several physical

disks. Up to 32 disks can be included into one volume, thus overcoming the hardware size

limitations, but if at least one disk fails, all data will be lost, and no part of a spanned volume may

be removed without destroying the entire volume. So, a spanned volume provides no additional

reliability, nor a better I/O rate.

Striped Volume

A volume, also sometimes called RAID 0, consisting of equal sized stripes of data, written across

each disk in the volume; it means that to create a striped volume, a user will need two or more

dynamic disks. The disks in a striped volume don’t have to be identical, but there must be unused

space available on each disk that you want to include in the volume and the size of the volume

will depend on the size of the smallest space. Access to the data on a striped volume is usually

faster than access to the same data on a single physical disk, because the I/O is spread across

more than one disk.

Striped volumes are created for improved performance, not for their better reliability - they do

not contain redundant information.

Mirrored Volume

A fault-tolerant volume, also sometimes called RAID 1, whose data is duplicated on two identical

physical disks. All of the data on one disk is copied to another disk to provide data redundancy.

Almost any volume can be mirrored, including the system and boot volumes, and if one of the

disks fails, the data can still be accessed from the remaining disks. Unfortunately, the hardware

limitations on size and performance are even more severe with the use of mirrored volumes.

Mirrored-Striped Volume

A fault-tolerant volume, also sometimes called RAID 1+0, combining the advantage of the high

I/O speed of the striped layout and redundancy of the mirror type. The evident disadvantage

remains inherent with the mirror architecture - a low disk-to-volume size ratio.

RAID-5

A fault-tolerant volume whose data is striped across an array of three or more disks. The disks do

not need to be identical, but there must be equally sized blocks of unallocated space available on

each disk in the volume. Parity (a calculated value that can be used to reconstruct data in case of

failure) is also striped across the disk array. And it is always stored on a different disk than the

data itself. If a physical disk fails, the portion of the RAID-5 volume that was on that failed disk

can be re-created from the remaining data and the parity. A RAID-5 volume provides reliability

and is able to overcome the physical disk size limitations with a higher than mirrored disk-to-

volume size ratio.

Create volume wizard

The Create volume wizard lets you create any type of volume (including system and active), select a

file system, label, assign a letter, and also provides other disk management functions.

Its pages will enable you to enter operation parameters, proceeding step-by-step further on and

return to any previous step if necessary to change any previously selected options. To help you with

your choices, each parameter is supplemented with detailed instructions.

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ACRONIS Backup & Recovery 10 Advanced Server User's Guide Page 292