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Redundant Data & New HD: How Does it Work RRS feed

  • Question

  • Can somebody explain when my data is safe from a HD failure and how the system handles an event where a new HD is inserted. Here are some cases:

    1) 500GB HD = 500GB available, no redundant data
    2) 500GB HD, insert 500GB HD = 500GB available, redundant data (mirror)
    3) 500GB HD + 500GB HD, insert 500GB HD = 1TB available, redundant data (RAID 5)
    4) 500GB HD + 500GB HD, insert 1GB = 1TB available, redundant data (2 HDs mirrored on 1)
    5) 500GB HD + 500GB HD, insert 250GB HD = 500GB redundant (mirror) + 250 non-redundant

    Are the above scenarios correct?

    Thanks
    Wednesday, November 26, 2008 4:26 PM

Answers

  • hfaun said:

    Can somebody explain when my data is safe from a HD failure and how the system handles an event where a new HD is inserted. Here are some cases:

    1) 500GB HD = 500GB available, no redundant data
    2) 500GB HD, insert 500GB HD = 500GB available, redundant data (mirror)
    3) 500GB HD + 500GB HD, insert 500GB HD = 1TB available, redundant data (RAID 5)
    4) 500GB HD + 500GB HD, insert 1GB = 1TB available, redundant data (2 HDs mirrored on 1)
    5) 500GB HD + 500GB HD, insert 250GB HD = 500GB redundant (mirror) + 250 non-redundant

    Are the above scenarios correct?

    Thanks


    WHS doesn't use RAID at all (as a matter of fact, RAID on WHS is unsupported).  It uses Folder Duplication.  It's similar to RAID 1, but it's done on a per-share-basis, not per-drive.  As for when you add a drive, it just adds the drive to the storage pool.

    You should check the Technical Briefs for more info as to how WHS works.
    Wednesday, November 26, 2008 5:31 PM
    Moderator

All replies

  • hfaun said:

    Can somebody explain when my data is safe from a HD failure and how the system handles an event where a new HD is inserted. Here are some cases:

    1) 500GB HD = 500GB available, no redundant data
    2) 500GB HD, insert 500GB HD = 500GB available, redundant data (mirror)
    3) 500GB HD + 500GB HD, insert 500GB HD = 1TB available, redundant data (RAID 5)
    4) 500GB HD + 500GB HD, insert 1GB = 1TB available, redundant data (2 HDs mirrored on 1)
    5) 500GB HD + 500GB HD, insert 250GB HD = 500GB redundant (mirror) + 250 non-redundant

    Are the above scenarios correct?

    Thanks


    WHS doesn't use RAID at all (as a matter of fact, RAID on WHS is unsupported).  It uses Folder Duplication.  It's similar to RAID 1, but it's done on a per-share-basis, not per-drive.  As for when you add a drive, it just adds the drive to the storage pool.

    You should check the Technical Briefs for more info as to how WHS works.
    Wednesday, November 26, 2008 5:31 PM
    Moderator
  • I found the technical document. That's very helpful. Thanks.
    Wednesday, November 26, 2008 6:58 PM