is a spanned volume less safe than 2 simple volumes?

Discussion in 'OT Technology' started by dorkultra, Sep 17, 2007.

  1. dorkultra

    dorkultra OT's resident crohns dude OT Supporter

    Joined:
    Oct 14, 2005
    Messages:
    22,753
    Likes Received:
    29
    Location:
    yinzer / nilbog, trollhio
    i have 2 hard drives. it makes it easy if i span the data to one drive letter. if one of the disks fails, will i lose everything, or just some of the stuff?
     
  2. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    if you are referring to jbod then you lose whatever is on the disk that fails.
     
  3. CodeX

    CodeX Guest

    You will obviously only lose what is on the disk that fails, the data exists in a physical state regardless of how the computer is representing it. More than likely 99% of the data on the failed disk would be retrievable anyway.
     
  4. crontab

    crontab (uid = 0)

    Joined:
    Nov 14, 2000
    Messages:
    23,458
    Likes Received:
    12
    for clarification, if you loose any member in a concatenated volume and your file systems spans the entire volume, that file system will not come up.

    data can be recovered from the good disk(s), but don't expect your drive to just work with a disk missing from the volume.
     
  5. dorkultra

    dorkultra OT's resident crohns dude OT Supporter

    Joined:
    Oct 14, 2005
    Messages:
    22,753
    Likes Received:
    29
    Location:
    yinzer / nilbog, trollhio
    gotcha. heres some of my setup, it is only temporary anyways till i throw in a 500gb drive or something

    i have tivo files, about 1.2gb each on one drive. i threw in another drive and spanned the volume to have the same drive letter. the new drive i threw in might have about 10 of those files, nothing major.

    any easy way of seeing what is on each volume or do i have to break the span first?
     
  6. deusexaethera

    deusexaethera OT Supporter

    Joined:
    Jan 27, 2005
    Messages:
    19,712
    Likes Received:
    0
    No, it's not less safe. Each disk stores its own table of contents.
     
  7. crontab

    crontab (uid = 0)

    Joined:
    Nov 14, 2000
    Messages:
    23,458
    Likes Received:
    12
    That is incorrect. As usual...
     
  8. deusexaethera

    deusexaethera OT Supporter

    Joined:
    Jan 27, 2005
    Messages:
    19,712
    Likes Received:
    0
    Then explain to me why I can plug a single disk from a multi-disk span into another machine and read its contents? And no, it's not always Disk 1 or Disk N (where N == the number of disks in the span).
     
  9. crontab

    crontab (uid = 0)

    Joined:
    Nov 14, 2000
    Messages:
    23,458
    Likes Received:
    12
    Don't ask me. You're doing it wrong.
     
  10. deusexaethera

    deusexaethera OT Supporter

    Joined:
    Jan 27, 2005
    Messages:
    19,712
    Likes Received:
    0
    Oh come on! Is that the best you can do?
     
  11. crontab

    crontab (uid = 0)

    Joined:
    Nov 14, 2000
    Messages:
    23,458
    Likes Received:
    12
    Do more of what? If a single member of a volume that spans multiple disks is removed. That volume is down. You are doing something else or are delusional and wrong. Past experience shows the latter. No need to waste more time reinforcing your stupidity. Carry on and please stop giving advice when I post in a thread. It's quite annoying.
     
  12. deusexaethera

    deusexaethera OT Supporter

    Joined:
    Jan 27, 2005
    Messages:
    19,712
    Likes Received:
    0
    The spanned volume is down, yes, but you can remount the individual disks as separate volumes. Files that bridge from one disk to another will be irretrievable except perhaps with the use of a concatenator, but the files stored entirely on each of the single disks should be fine. It would be ridiculously stupid for a disk's table of contents to be stored anywhere but on itself, regardless of whether it's part of a span.
     
  13. crontab

    crontab (uid = 0)

    Joined:
    Nov 14, 2000
    Messages:
    23,458
    Likes Received:
    12
    again, no such thing as a "table of contents" on disk.

    again, carry the fuck on.
     
  14. deusexaethera

    deusexaethera OT Supporter

    Joined:
    Jan 27, 2005
    Messages:
    19,712
    Likes Received:
    0
    I know you're a hardcore IT guy, and you expect to hear correct terminology. What matters to me is whether people understand the concept behind what I'm explaining to them. File allocation table, Inode tree, call it what you want. I call it a table of contents because that's what makes sense to most people.
     
  15. P07r0457

    P07r0457 New Member

    Joined:
    Sep 20, 2004
    Messages:
    28,491
    Likes Received:
    0
    Location:
    Southern Oregon
    how can someone understand the "concept" you're explaining when even YOU don't understand what what you're trying to explain?
     
  16. CodeX

    CodeX Guest

    Its like the battle of the 40 year old virgins in here...
     

Share This Page