Disk Shadowing Vs Disk Mirroring RRS feed

  • Question

  • what is Disk Shadowing & Disk Mirroring. And what is difference between Disk Shadowing & Disk Mirroring ?
    Sunday, November 24, 2013 12:39 PM

All replies

  • Volumes have been written about this (pun intended), but I'll try to keep it simple:

    1. Mirroring is when two physical disks are paired together in a type of RAID configuration to appear as a single drive to the operating system. All data on one disk is redundantly duplicated on the other, providing fail-over protection in case of a single drive failure. (WHS v1 used a type of software mirroring for network shares called folder duplication that is similar in concept but way different in implementation.)

    2. Shadowing is a Windows technology that enables the operating system to create "logical snapshots" of NTFS volumes that are consistent at a given point in time. These snapshots are known as volume shadow copies, and can be used to restore the state of the file system (or files within it) to an earlier point in time. This technology supports the previous versions feature in WHS 2011 and is also used to support backup operations in Windows Home Server.

    These things sound like they should be related but they really aren't.

    • Edited by Gary Voth Tuesday, November 26, 2013 5:10 AM
    Tuesday, November 26, 2013 4:58 AM