sharing HBAs between disk and tape

Discussion in 'Storage' started by Keith Michaels, Sep 6, 2003.

  1. Can a single fibrechannel HBA be shared between disk and tape?
    This is for a Windows 2000 fileserver that has an HBA for SAN disk
    but will now run backup and/or HSM to fibrechannel drives that
    are also SAN-attached. If the HBA can be shared can it support
    simultaneous access to more than one tape drive? Backup/HSM
    software is not decided yet, Veritas, Tivoli, or ???
     
    Keith Michaels, Sep 6, 2003
    #1
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  2. Keith Michaels

    J&J Guest

    yes you can share it. and as for backup software I use veritas netbackup.
    (but under solaris). It's a good product but could be better, specially in
    the schedule area.
     
    J&J, Sep 8, 2003
    #2
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  3. Keith Michaels

    Boll Weevil Guest

    Yes, you can share the HBA with disk and tape but it is not recommended.
    Disk does random read/rights while tape does streaming reads/writes. If
    your server gets high I/O like in a production invironment, your backups
    will eventually have problems. The disk traffic will interrupt the
    backup traffic and will either cause shoe-shining and eventual backup
    failures. Also, if you ever want to do server-less backups, you must
    have a second HBA.
     
    Boll Weevil, Sep 9, 2003
    #3
  4. years ago that was, eh?). Granted, this was with Linux, which used a simple
    Windows too.
    If the LUN does not support tagged queue - then the requests for it are in the
    single queue indexed by the block number.

    Tape I/O is also zero-copy in Windows, and so is disk file IO if the file is
    opened as noncached.

    Max
     
    Maxim S. Shatskih, Sep 10, 2003
    #4
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